{"id":3903,"date":"2026-07-24T10:56:33","date_gmt":"2026-07-24T02:56:33","guid":{"rendered":"https:\/\/jblstainless.com\/?post_type=product&#038;p=3903"},"modified":"2026-07-24T10:56:42","modified_gmt":"2026-07-24T02:56:42","slug":"q550-q550b-q550c-q550d-q550e-high-strength-steel","status":"publish","type":"product","link":"https:\/\/jblstainless.com\/uk\/q550-q550b-q550c-q550d-q550e-high-strength-steel\/","title":{"rendered":"Q550 Q550B Q550C Q550D Q550E High Strength Steel"},"content":{"rendered":"\t\t<div data-elementor-type=\"product-post\" data-elementor-id=\"3903\" class=\"elementor elementor-3903\" data-elementor-post-type=\"product\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4bca1b5 e-flex e-con-boxed e-con e-parent\" data-id=\"4bca1b5\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7023d2a elementor-widget elementor-widget-text-editor\" data-id=\"7023d2a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"color: #ff6600;\">jblstainless Q550 Q550B Q550C Q550D Q550E High Strength Steel<\/span> From raw material selection to precise rolling, and then to heat treatment strengthening, every step is strictly controlled. By optimizing the alloy composition and controlling the rolling and cooling processes, the plates can ensure both strength and ductility, meeting the requirements of complex engineering projects. Q550 is commonly used in structural components such as bridges, buildings, and vehicles.<br \/>The modern Q550 high-strength steel plate factory focuses on energy conservation and emission reduction, adopting technologies such as waste heat recovery and low-emission smelting to reduce the impact on the environment and promote the transformation of the steel industry towards a <span style=\"color: #ff6600;\">low-carbon<\/span> model.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-6171e89 e-flex e-con-boxed e-con e-parent\" data-id=\"6171e89\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-4230ed3 e-con-full e-flex e-con e-child\" data-id=\"4230ed3\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a0c5c38 elementor-widget elementor-widget-image\" data-id=\"a0c5c38\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"700\" height=\"700\" src=\"https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Q550-low-carbon-steels-.png\" class=\"attachment-large size-large wp-image-3913\" alt=\"\" srcset=\"https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Q550-low-carbon-steels-.png 700w, https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Q550-low-carbon-steels--150x150.png 150w, https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Q550-low-carbon-steels--12x12.png 12w, https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Q550-low-carbon-steels--300x300.png 300w, https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Q550-low-carbon-steels--600x600.png 600w, https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Q550-low-carbon-steels--100x100.png 100w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-17871f2 e-con-full e-flex e-con e-child\" data-id=\"17871f2\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-5ab124f elementor-widget elementor-widget-spacer\" data-id=\"5ab124f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-94f8433 elementor-widget elementor-widget-text-editor\" data-id=\"94f8433\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"color: #ff6600;\">Q550 high-strength plates can be used in which fields?<\/span><\/p><p>Excavator boom \/ Crane main beam \/ Mining dump truck frame \/ Hydraulic support \/ Crusher structure \/ Main beam of large-span bridge \/ Bridge piers \/ High-rise steel structure beams and columns \/ Large factory support framework \/ Pressure pipe of hydropower station \/ Wind turbine tower (especially in cold regions) \/ Petrochemical storage tanks and high-pressure pipelines \/ Railway freight car bogie \/ Heavy truck chassis \/ Key structural components of ships \/ Nuclear power auxiliary structure \/ Aerospace ground support devices \/ Heavy machinery base<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-c3c1b97 e-flex e-con-boxed e-con e-parent\" data-id=\"c3c1b97\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-5d7ecae e-con-full e-flex e-con e-child\" data-id=\"5d7ecae\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f092f91 elementor-widget elementor-widget-text-editor\" data-id=\"f092f91\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"color: #ff6600;\">High-strength steel plate Q550 &#8212;&#8212; Chemical elements<\/span><\/p><ul><li>\u200c\u00a0(C)\u200c\uff1a\u22640.18%\uff08<\/li><li>\u200c\u00a0(Si)\u200c\uff1a\u22640.55%<\/li><li>\u200c\u00a0(Mn)\u200c\uff1a1.00%\uff5e1.70%<\/li><li>\u200c\u00a0(P)\u200c\uff1a\u22640.030%<\/li><li>\u200c\u00a0(S)\u200c\uff1a\u22640.030%<\/li><li>\u200c\u00a0(Al)\u200c\uff1a\u22650.015%<\/li><\/ul><ul><li>\u00a0(Nb)\u22640.11%\u3001<\/li><li>\u00a0(V)\u22640.12%\u3001<\/li><li>\u00a0(Ti)\u22640.20%<\/li><li>\u00a0(Cr)\u22640.80%<\/li><li>\u00a0(Ni)\u22640.80%\u3001<\/li><li>\u00a0(Mo)\u22640.30%\u3001<\/li><li>\u00a0(Cu)\u22640.80%<\/li><li>Micro-intensification \u200c : boron (B)\u22640.004%, nitrogen (N)\u22640.015%<\/li><\/ul><p><span style=\"color: #ff6600;\">Q550 High Tensile Strength Steel Plate &#8212;&#8212; Chemical elements<\/span><\/p><ul><li>\u200cLower yield strength (ReL\/Rp0.2): \u2265 550 MPa<\/li><li>Tensile strength (Rm): 670\u2013830 MPa<\/li><li>\u200cPost-rupture elongation (A): \u2265 16%<\/li><li>Cold bending performance: 180\u00b0 qualified, bending diameter d = 3a (a is the sample thickness)<\/li><li>\u200cImpact absorption energy (KV2): Longitudinal sample<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-5ee3e40 e-con-full e-flex e-con e-child\" data-id=\"5ee3e40\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-fbc9e66 elementor-widget elementor-widget-image\" data-id=\"fbc9e66\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"700\" height=\"587\" src=\"https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Q550-High-Tensile-Strength-Steel-Plate.png\" class=\"attachment-large size-large wp-image-3914\" alt=\"\" srcset=\"https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Q550-High-Tensile-Strength-Steel-Plate.png 700w, https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Q550-High-Tensile-Strength-Steel-Plate-14x12.png 14w, https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Q550-High-Tensile-Strength-Steel-Plate-600x503.png 600w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-8ddaaab e-flex e-con-boxed e-con e-parent\" data-id=\"8ddaaab\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-2e7dd04 e-con-full e-flex e-con e-child\" data-id=\"2e7dd04\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-1251359 elementor-widget elementor-widget-image\" data-id=\"1251359\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"700\" height=\"438\" src=\"https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Q550-high-strength-steel.png\" class=\"attachment-large size-large wp-image-3915\" alt=\"\" srcset=\"https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Q550-high-strength-steel.png 700w, https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Q550-high-strength-steel-18x12.png 18w, https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Q550-high-strength-steel-600x375.png 600w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-fbd9057 e-con-full e-flex e-con e-child\" data-id=\"fbd9057\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a54b1a2 elementor-widget elementor-widget-spacer\" data-id=\"a54b1a2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7d0e110 elementor-widget elementor-widget-text-editor\" data-id=\"7d0e110\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong><span style=\"color: #ff6600;\">What services can JBL Company provide for the Q550?<\/span><\/strong><\/p><ul><li>Spot supply and customized supply<\/li><li>Precision processing<\/li><li>Technical selection support<\/li><li>Quality and delivery guarantee<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-b777a68 e-flex e-con-boxed e-con e-parent\" data-id=\"b777a68\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-b232efa e-con-full e-flex e-con e-child\" data-id=\"b232efa\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-9150854 elementor-widget elementor-widget-text-editor\" data-id=\"9150854\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"color: #ff6600;\">What kinds of test reports will be provided when the Q550 low-carbon steels\u00a0 are manufactured?<\/span><\/p><p>MTC + chemical composition + stretching + impact + UT inspection + hardness + third-party inspection report<\/p><ul><li data-section-id=\"1o4r7z\" data-start=\"1955\" data-end=\"1960\">SGS<\/li><li data-section-id=\"yhmtto\" data-start=\"1961\" data-end=\"1965\">BV<\/li><li data-section-id=\"1o4rhb\" data-start=\"1966\" data-end=\"1971\">TUV<\/li><li data-section-id=\"1nji8ba\" data-start=\"1972\" data-end=\"1982\">Intertek<\/li><\/ul><p>.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-3d03364 e-con-full e-flex e-con e-child\" data-id=\"3d03364\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-5d63835 elementor-widget elementor-widget-image\" data-id=\"5d63835\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"700\" height=\"488\" src=\"https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Q550-Steel.jpg\" class=\"attachment-large size-large wp-image-3910\" alt=\"\" srcset=\"https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Q550-Steel.jpg 700w, https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Q550-Steel-18x12.jpg 18w, https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Q550-Steel-600x418.jpg 600w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-1b8c392 e-flex e-con-boxed e-con e-parent\" data-id=\"1b8c392\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-555c5c5 elementor-widget elementor-widget-spacer\" data-id=\"555c5c5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-27d4e64 elementor-align-center elementor-widget elementor-widget-button\" data-id=\"27d4e64\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/jblstainless.com\/contact\/\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t<span class=\"elementor-button-icon\">\n\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-far-hand-point-right\" viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M428.8 137.6h-86.177a115.52 115.52 0 0 0 2.176-22.4c0-47.914-35.072-83.2-92-83.2-45.314 0-57.002 48.537-75.707 78.784-7.735 12.413-16.994 23.317-25.851 33.253l-.131.146-.129.148C135.662 161.807 127.764 168 120.8 168h-2.679c-5.747-4.952-13.536-8-22.12-8H32c-17.673 0-32 12.894-32 28.8v230.4C0 435.106 14.327 448 32 448h64c8.584 0 16.373-3.048 22.12-8h2.679c28.688 0 67.137 40 127.2 40h21.299c62.542 0 98.8-38.658 99.94-91.145 12.482-17.813 18.491-40.785 15.985-62.791A93.148 93.148 0 0 0 393.152 304H428.8c45.435 0 83.2-37.584 83.2-83.2 0-45.099-38.101-83.2-83.2-83.2zm0 118.4h-91.026c12.837 14.669 14.415 42.825-4.95 61.05 11.227 19.646 1.687 45.624-12.925 53.625 6.524 39.128-10.076 61.325-50.6 61.325H248c-45.491 0-77.21-35.913-120-39.676V215.571c25.239-2.964 42.966-21.222 59.075-39.596 11.275-12.65 21.725-25.3 30.799-39.875C232.355 112.712 244.006 80 252.8 80c23.375 0 44 8.8 44 35.2 0 35.2-26.4 53.075-26.4 70.4h158.4c18.425 0 35.2 16.5 35.2 35.2 0 18.975-16.225 35.2-35.2 35.2zM88 384c0 13.255-10.745 24-24 24s-24-10.745-24-24 10.745-24 24-24 24 10.745 24 24z\"><\/path><\/svg>\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">jblstainless    Click here<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-a28db01 e-flex e-con-boxed e-con e-parent\" data-id=\"a28db01\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-26d62b7 elementor-widget elementor-widget-text-editor\" data-id=\"26d62b7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<table><thead><tr><th align=\"left\">mark<\/th><th align=\"left\">Impact test temperature<\/th><th align=\"left\">Minimum impact energy (KV\u2082)<\/th><th align=\"left\">Upper limit of phosphorus (P)<\/th><th align=\"left\">Sulfur (S) upper limit<\/th><th align=\"left\">Typical delivery status<\/th><th align=\"left\"><p><span class=\"tran-text\">applicable scene<\/span><\/p><div class=\"voicePlayer\" data-v-3c914892=\"\">\u00a0<\/div><\/th><\/tr><\/thead><tbody><tr><td align=\"left\">\u200c<strong>Q550B<\/strong>\u200c<\/td><td align=\"left\">20\u2103 (At room temperature)<\/td><td align=\"left\">\u226527J\/34J*<\/td><td align=\"left\">\u22640.040%<\/td><td align=\"left\">\u22640.040%<\/td><td align=\"left\">Hot rolling\/controlled rolling<\/td><td align=\"left\">Normal-temperature heavy-duty structure with no low-temperature requirements<\/td><\/tr><tr><td align=\"left\">\u200c<strong>Q550C<\/strong>\u200c<\/td><td align=\"left\">0\u2103<\/td><td align=\"left\">\u226534J<\/td><td align=\"left\">\u22640.035%<\/td><td align=\"left\">\u22640.035%<\/td><td align=\"left\">TMCP\/Quenching and Tempering<\/td><td align=\"left\">General low-temperature environments, mining machinery, cranes<\/td><\/tr><tr><td align=\"left\">\u200c<strong>Q550D<\/strong>\u200c<\/td><td align=\"left\">-20\u2103<\/td><td align=\"left\">\u226534J (Regular control \u2265 40J)<\/td><td align=\"left\">\u22640.030%<\/td><td align=\"left\">\u22640.030%<\/td><td align=\"left\">Quenching and tempering (QT) is the main approach<\/td><td align=\"left\">Cold region engineering, offshore wind power, port equipment<\/td><\/tr><tr><td align=\"left\">\u200c<strong>Q550E<\/strong>\u200c<\/td><td align=\"left\">-40\u2103<\/td><td align=\"left\">\u226527J\/34J*<\/td><td align=\"left\">\u22640.025%<\/td><td align=\"left\">\u22640.025%<\/td><td align=\"left\">Tempering (QT)<\/td><td align=\"left\">Extremely cold regions, LNG facilities, nuclear power, military industry<\/td><\/tr><tr><td align=\"left\">\u200c<strong>Q550F<\/strong>\u200c<\/td><td align=\"left\">-60\u2103(Contract)<\/td><td align=\"left\">\u226527J (Contract)<\/td><td align=\"left\">\u22640.020%<\/td><td align=\"left\">\u22640.020%<\/td><td align=\"left\">Tempering (QT)<\/td><td align=\"left\">Ultra-low temperature special equipment (Customized agreement required)<\/td><\/tr><tr><td align=\"left\">\u200c<strong>Q550qC<\/strong>\u200c<\/td><td align=\"left\">0\u2103<\/td><td align=\"left\">\u226547J (Bridge-specific)<\/td><td align=\"left\">\u22640.025%<\/td><td align=\"left\">\u22640.020%<\/td><td align=\"left\">TMCP+ Ultra-fast cooling<\/td><td align=\"left\">Long-span Bridges (with high fatigue performance requirements)<\/td><\/tr><\/tbody><\/table>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-fee82ab e-flex e-con-boxed e-con e-parent\" data-id=\"fee82ab\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-c5b5994 elementor-widget elementor-widget-text-editor\" data-id=\"c5b5994\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"color: #ff6600;\">What is Q550 high strength steel?<\/span><\/p><p>Q550 steel plate is a high-strength, high-toughness low-alloy structural steel plate.<\/p><p><span style=\"color: #ff6600;\">What do the &#8220;Q&#8221; and &#8220;550&#8221; in Q550 represent?<\/span><\/p><p>In Q550 high-strength structural steel, the &#8220;Q&#8221; represents the yield strength, and 550 indicates that the lower limit value of its yield strength is 550 N\/mm\u00b2.<\/p><p><span style=\"color: #ff6600;\">What are the common thicknesses, widths and lengths of Q550?<\/span><\/p><ul><li>Q550 series steel plates &#8211; Thickness\uff1a 6 to 100mm (customizable from 3 to 350mm)<\/li><li>width \uff1a1500 &#8211; 4200mm<\/li><li>length \uff1a6000 &#8211; 18000mm<\/li><\/ul><p><span style=\"color: #ff6600;\">Can Q550 be produced in fixed-length batches?<\/span><\/p><p>yes<\/p><p><span style=\"color: #ff6600;\">What is the carbon equivalent value (CEV) of Q550?<\/span><\/p><p>\u22640.45%<\/p><p><span style=\"color: #ff6600;\">Is Industrial Grade Steel Plate Q550 suitable for low-temperature environments?<\/span><\/p><p>yes<\/p><p><span style=\"color: #ff6600;\">\u00a0Q550 high-strength structural steel is easy to weld?<\/span><\/p><p>yes<\/p><p><span style=\"color: #ff6600;\">Does JBL Does JBL support third-party testing (such as SGS, BV, T\u00dcV, etc.)? support third-party testing (such as SGS, BV, T\u00dcV, etc.)?<\/span><\/p><p>yes<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-4c3d705 e-flex e-con-boxed e-con e-parent\" data-id=\"4c3d705\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-f103a9f e-con-full e-flex e-con e-child\" data-id=\"f103a9f\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-cfca27c elementor-widget elementor-widget-image\" data-id=\"cfca27c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"700\" height=\"700\" src=\"https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Q550-Hot-Rolled-Steel-H-Beam.png\" class=\"attachment-large size-large wp-image-3931\" alt=\"\" srcset=\"https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Q550-Hot-Rolled-Steel-H-Beam.png 700w, https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Q550-Hot-Rolled-Steel-H-Beam-150x150.png 150w, https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Q550-Hot-Rolled-Steel-H-Beam-12x12.png 12w, https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Q550-Hot-Rolled-Steel-H-Beam-300x300.png 300w, https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Q550-Hot-Rolled-Steel-H-Beam-600x600.png 600w, https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Q550-Hot-Rolled-Steel-H-Beam-100x100.png 100w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-caae7b0 elementor-widget elementor-widget-text-editor\" data-id=\"caae7b0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p style=\"text-align: center;\"><span style=\"color: #ff6600;\">Q550 H Beam<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-7a1920c e-con-full e-flex e-con e-child\" data-id=\"7a1920c\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-c613fcc elementor-widget elementor-widget-image\" data-id=\"c613fcc\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"700\" height=\"539\" src=\"https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Q235-steel-pipe.png\" class=\"attachment-large size-large wp-image-3928\" alt=\"\" srcset=\"https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Q235-steel-pipe.png 700w, https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Q235-steel-pipe-16x12.png 16w, https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Q235-steel-pipe-600x462.png 600w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-70d1b9b elementor-widget elementor-widget-text-editor\" data-id=\"70d1b9b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p style=\"text-align: center;\"><span style=\"color: #ff6600;\">Q550 steel pipe<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-97961b2 e-flex e-con-boxed e-con e-parent\" data-id=\"97961b2\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-5464c2a e-con-full e-flex e-con e-child\" data-id=\"5464c2a\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-b935d6f elementor-widget elementor-widget-image\" data-id=\"b935d6f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"700\" height=\"700\" src=\"https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/High-Quality-OEM-ODM-Q550-Carbon-Steel-PlatesSheets.png\" class=\"attachment-large size-large wp-image-3930\" alt=\"\" srcset=\"https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/High-Quality-OEM-ODM-Q550-Carbon-Steel-PlatesSheets.png 700w, https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/High-Quality-OEM-ODM-Q550-Carbon-Steel-PlatesSheets-150x150.png 150w, https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/High-Quality-OEM-ODM-Q550-Carbon-Steel-PlatesSheets-12x12.png 12w, https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/High-Quality-OEM-ODM-Q550-Carbon-Steel-PlatesSheets-300x300.png 300w, https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/High-Quality-OEM-ODM-Q550-Carbon-Steel-PlatesSheets-600x600.png 600w, https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/High-Quality-OEM-ODM-Q550-Carbon-Steel-PlatesSheets-100x100.png 100w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-56bb579 elementor-widget elementor-widget-text-editor\" data-id=\"56bb579\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p style=\"text-align: center;\"><span style=\"color: #ff6600;\">Q550 Carbon Steel PlatesSheets<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-24af8d8 e-con-full e-flex e-con e-child\" data-id=\"24af8d8\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2ac0869 elementor-widget elementor-widget-image\" data-id=\"2ac0869\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"700\" height=\"700\" src=\"https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Q-550-Steel-Square-Tube-Seamless-Carbon-Steel.png\" class=\"attachment-large size-large wp-image-3929\" alt=\"\" srcset=\"https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Q-550-Steel-Square-Tube-Seamless-Carbon-Steel.png 700w, https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Q-550-Steel-Square-Tube-Seamless-Carbon-Steel-150x150.png 150w, https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Q-550-Steel-Square-Tube-Seamless-Carbon-Steel-12x12.png 12w, https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Q-550-Steel-Square-Tube-Seamless-Carbon-Steel-300x300.png 300w, https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Q-550-Steel-Square-Tube-Seamless-Carbon-Steel-600x600.png 600w, https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Q-550-Steel-Square-Tube-Seamless-Carbon-Steel-100x100.png 100w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1f249ef elementor-widget elementor-widget-text-editor\" data-id=\"1f249ef\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p style=\"text-align: center;\"><span style=\"color: #ff6600;\">Q550 Steel Square Tube<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-5324e66 e-flex e-con-boxed e-con e-parent\" data-id=\"5324e66\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-ee8402c elementor-widget elementor-widget-wpforms\" data-id=\"ee8402c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"wpforms.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"wpforms-container wpforms-container-full wpforms-render-modern\" id=\"wpforms-160\"><form id=\"wpforms-form-160\" class=\"wpforms-validate wpforms-form wpforms-ajax-form\" data-formid=\"160\" method=\"post\" enctype=\"multipart\/form-data\" action=\"\/uk\/wp-json\/wp\/v2\/product\/3903\" data-token=\"dfe43d1f8f22e3ae26f5d60b45932583\" data-token-time=\"1785994000\"><noscript class=\"wpforms-error-noscript\">\u0414\u043b\u044f \u0437\u0430\u043f\u043e\u0432\u043d\u0435\u043d\u043d\u044f \u0446\u0456\u0454\u0457 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.wpforms-container -->\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-47366db elementor-widget elementor-widget-text-editor\" data-id=\"47366db\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"color: #ff6600;\">What are the differences between Q550 and Q460?<\/span><\/p><p>High Strength Structural Steels Q550 has a yield strength of \u2265 550 MPa, while Q460 has a yield strength of \u2265 460 MPa. The main difference between the two lies in their strength grades. high-strength steel Q550 has a higher strength and is suitable for more heavy-load structures.<\/p><p><span style=\"color: #ff6600;\">What are the differences between Q550 and Q690?<\/span><\/p><p>Q550 and Q690 are both types of high-strength steel. Among them, the yield strength of Steel Plates Grade Q550 is no less than 550 megapascals, while that of Q690 is no less than 690 megapascals.<\/p><p><span style=\"color: #ff6600;\">What are the advantages of Q550 compared to Q355?<\/span><\/p><p>Q550 and Q355 both belong to low-alloy high-strength structural steels, but Q550 High Strength Steel Plate High Strength Alloy Steel Sheet has significant advantages in terms of load-bearing capacity and material efficiency.<\/p><p><span style=\"color: #ff6600;\">Can Q550 replace Q460?<\/span><\/p><p>From the perspective of mechanical properties, ultra-high-strength steel plate Q550 can replace Q460.<\/p><p><span style=\"color: #ff6600;\">When is it not recommended to replace Q550 with Q690?<\/span><\/p><p>Under extreme working conditions, stringent welding requirements and high toughness low-temperature environments, it is not recommended to replace Q690 with Hot Rolled Q550 High Strength Steel Plate.<\/p><p><span style=\"color: #ff6600;\">Which foreign brand does Q550 correspond to?<\/span><\/p><ul><li>EU standard (EN): S550 series \/<\/li><li>Q550D\/E: S550QL or S550ML \/<\/li><li>US standard (ASTM\/AISI): ASTM A710 (Class 3) or ASTM A514 (T1 type) \/<\/li><li>Japanese standard (JIS): SM570 series \/<\/li><li>German standard (DIN): Corresponding to StE550 or S550 series \/<\/li><li>Q550D: -20\u2103 impact, corresponding to European standard J2 or K2 grade \/<\/li><li>Q550E: -40\u2103 impact, corresponding to European standard NL or ML grade, suitable for cold region structures \/<\/li><\/ul><p><span style=\"color: #ff6600;\">Why is Q550 steel prone to deformation?<\/span><\/p><p>The Q550F carbon steel itself is a type of high-strength steel and is not prone to deformation under load. The so-called &#8220;easy deformation&#8221; usually occurs due to <span style=\"color: #ff6600;\"><strong>improper processing and cutting techniques<\/strong><\/span>, unremoved thermal treatment stresses, or exceeding its 550 MPa yield limit.<\/p><p><span style=\"color: #ff6600;\">Q550 &#8211; How to choose the thickness?<\/span><\/p><ul><li>3-4mm (ultra-thin\/thin sheet): Suitable for precision components that are sensitive to weight. Such as the anti-collision beam of new energy vehicles, battery trays, and the frame of construction machinery cab\uff08Q550 high-strength steel\uff09.<\/li><li>5-6mm (Medium-thin Plate): Balances strength and plasticity, suitable for dynamic load scenarios. Commonly used in the strengthening plates of mobile crane booms, the underframes of high-speed trains, the U-ribs of bridges, and the base materials of mining dump truck liners.<\/li><li>8-12mm (Medium-thick plate): Significantly enhanced load-bearing capacity, excellent fatigue resistance. Suitable for heavy equipment frames (such as the arm of an excavator), ship decks, large building supports, and heavy equipment bases.<\/li><\/ul><p><span style=\"color: #ff6600;\">Which countries can Q550 be exported to?<\/span><\/p><p>The Q550 Q550B Q550C Q550D Q550E High Strength Steel can be exported to Southeast Asia (Laos, Malaysia), Africa (East Africa), as well as countries and regions worldwide that follow American standards, European standards, and Japanese standards.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-884330c e-flex e-con-boxed e-con e-parent\" data-id=\"884330c\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f7ff9ef eael-dual-header-content-align-center elementor-widget elementor-widget-eael-dual-color-header\" data-id=\"f7ff9ef\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"eael-dual-color-header.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t<div class=\"eael-dual-header\">\n\t\t\t\t<h2 class=\"title eael-dch-title\"><span class=\"eael-dch-title-text eael-dch-title-lead lead solid-color\">In Situ Steel Strength Evaluation Using Brinell Hardness Method----<\/span> <span class=\"eael-dch-title-text\">A Case Study on Q550<\/span><\/h2>\t\t\t<\/div>\n\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-94ea845 e-con-full e-flex e-con e-child\" data-id=\"94ea845\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-6b78ce7 elementor-widget elementor-widget-image\" data-id=\"6b78ce7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"534\" src=\"https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Q550-1-1024x683.png\" class=\"attachment-large size-large wp-image-3940\" alt=\"\" srcset=\"https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Q550-1-1024x683.png 1024w, https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Q550-1-700x467.png 700w, https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Q550-1-768x512.png 768w, https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Q550-1-18x12.png 18w, https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Q550-1-600x400.png 600w, https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Q550-1.png 1536w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-aca91fc e-flex e-con-boxed e-con e-parent\" data-id=\"aca91fc\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-c90f3ab elementor-widget elementor-widget-text-editor\" data-id=\"c90f3ab\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>**********After the Q550 high-strength plate has been in service for a long time, its remaining strength needs to be evaluated. However, since it is not possible to cut standard tensile specimens from the component, the **Brinell Hardness Test (HBW)** is usually used for on-site rapid detection.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-cd49937 e-flex e-con-boxed e-con e-parent\" data-id=\"cd49937\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e14dd05 eael-dual-header-content-align-center elementor-widget elementor-widget-eael-dual-color-header\" data-id=\"e14dd05\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"eael-dual-color-header.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t<div class=\"eael-dual-header\">\n\t\t\t\t<h2 class=\"title eael-dch-title\"><span class=\"eael-dch-title-text eael-dch-title-lead lead solid-color\">Coarse-Grain Heat-Affected Zone Microstructure Evolution and Crack Propagation of<\/span> <span class=\"eael-dch-title-text\">Ca-Treated Q550 Thick-Steel Plate by High-Heat Input Welding<\/span><\/h2>\t\t\t<\/div>\n\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-0c5ac14 e-flex e-con-boxed e-con e-parent\" data-id=\"0c5ac14\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-8ffc93b elementor-widget elementor-widget-image\" data-id=\"8ffc93b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"640\" src=\"https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Coarse-Grain-Heat-Affected-Zone-Microstructure-Evolution-and-Crack-Propagation-of-Ca-Treated-Q550-Thick-Steel-Plate-by-High-Heat-Input-Welding-1024x819.png\" class=\"attachment-large size-large wp-image-3941\" alt=\"\" srcset=\"https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Coarse-Grain-Heat-Affected-Zone-Microstructure-Evolution-and-Crack-Propagation-of-Ca-Treated-Q550-Thick-Steel-Plate-by-High-Heat-Input-Welding-1024x819.png 1024w, https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Coarse-Grain-Heat-Affected-Zone-Microstructure-Evolution-and-Crack-Propagation-of-Ca-Treated-Q550-Thick-Steel-Plate-by-High-Heat-Input-Welding-700x560.png 700w, https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Coarse-Grain-Heat-Affected-Zone-Microstructure-Evolution-and-Crack-Propagation-of-Ca-Treated-Q550-Thick-Steel-Plate-by-High-Heat-Input-Welding-768x615.png 768w, https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Coarse-Grain-Heat-Affected-Zone-Microstructure-Evolution-and-Crack-Propagation-of-Ca-Treated-Q550-Thick-Steel-Plate-by-High-Heat-Input-Welding-15x12.png 15w, https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Coarse-Grain-Heat-Affected-Zone-Microstructure-Evolution-and-Crack-Propagation-of-Ca-Treated-Q550-Thick-Steel-Plate-by-High-Heat-Input-Welding-600x480.png 600w, https:\/\/jblstainless.com\/wp-content\/uploads\/2026\/07\/Coarse-Grain-Heat-Affected-Zone-Microstructure-Evolution-and-Crack-Propagation-of-Ca-Treated-Q550-Thick-Steel-Plate-by-High-Heat-Input-Welding.png 1402w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-c9efb4c e-flex e-con-boxed e-con e-parent\" data-id=\"c9efb4c\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2bec09e elementor-widget elementor-widget-text-editor\" data-id=\"2bec09e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>**********Under high heat input welding conditions, the coarse-grained heat-affected zone (CGHAZ) of Q550 thick steel plates treated with Ca experienced significant microstructure evolution, which had a decisive impact on the toughness and crack resistance of the welded joint. During the welding process, as the peak temperature usually exceeded 1100 \u2103, the original ferrite and pearlite structures were completely austenitized, and at the same time, the grains rapidly grew, resulting in the formation of coarse austenite grains. As the weld cooled down, the coarse-grained area mainly transformed into bainite, M\/A (martensite-austenite) components, and a small amount of Widmanst\u00e4tten structure. When the heat input was high and the cooling rate was slow, the M\/A components were prone to accumulate at the original austenite grain boundaries and become stress concentration areas, reducing the impact toughness of the coarse-grained area and providing favorable conditions for crack initiation.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-047289b e-flex e-con-boxed e-con e-parent\" data-id=\"047289b\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-6d22a66 elementor-button-align-stretch elementor-widget elementor-widget-form\" data-id=\"6d22a66\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;step_next_label&quot;:&quot;Next&quot;,&quot;step_previous_label&quot;:&quot;Previous&quot;,&quot;button_width&quot;:&quot;100&quot;,&quot;step_type&quot;:&quot;number_text&quot;,&quot;step_icon_shape&quot;:&quot;circle&quot;}\" data-widget_type=\"form.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<form class=\"elementor-form\" method=\"post\" name=\"New Form\" aria-label=\"New Form\">\n\t\t\t<input type=\"hidden\" name=\"post_id\" value=\"3903\"\/>\n\t\t\t<input type=\"hidden\" name=\"form_id\" value=\"6d22a66\"\/>\n\t\t\t<input type=\"hidden\" name=\"referer_title\" value=\"Q550 Q550B Q550C Q550D Q550E High Strength Steel - 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