{"id":2536,"date":"2026-03-24T17:28:39","date_gmt":"2026-03-24T09:28:39","guid":{"rendered":"https:\/\/jblstainless.com\/?post_type=product&p=2536"},"modified":"2026-03-24T17:28:40","modified_gmt":"2026-03-24T09:28:40","slug":"409l-stainless-steel-seamless-pipe","status":"publish","type":"product","link":"https:\/\/jblstainless.com\/zh\/409l-stainless-steel-seamless-pipe\/","title":{"rendered":"409L Stainless Steel Seamless Pipe"},"content":{"rendered":"
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In high-temperature exhaust systems, automotive manufacturing, and heat exchange equipment, the choice of material frequently determines the project\u2019s lifespan and maintenance costs.<\/p>

If you are looking for a material that:<\/p>

  • Costs less than austenitic stainless steel (such as 304\/316)<\/li>
  • Offers good oxidation resistance<\/li>
  • And suitable for both medium- and high-temperature environments (600\u2013800\u00b0C)<\/li><\/ul>

    The 409L stainless steel seamless pipe may be one of the most cost-effective solutions currently available on the market.<\/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

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    409L Stainless Steel Seamless Pipe Specification<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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    409L stainless steel (AISI 409L) is a typical ferritic stainless steel, commonly referred to as \u201cautomotive exhaust steel\u201d or \u201cexhaust pipe steel\u201d, also known as heat-resistant steel with good oxidation resistance and weldability. It is a low-carbon variant of 409 stainless steel (where \u201cL\u201d stands for \u201cLow carbon\u201d), with reduced carbon content to enhance weldability and resistance to intergranular corrosion. Due to its relatively low cost and stable performance, it is widely used in automotive exhaust systems, heat exchangers, and other high-temperature environments.<\/p>

    Compared to stainless steel 409, 409L has a lower carbon content and maintains high toughness without the post-weld heat treatment,completely resolving the \u201cpost-weld embrittlement\u201d issue associated with traditional ferritic stainless steels.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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    The 409L stainless steel pipe we manufacture are available in a broad range of specifications, sizes, diameters, and forms.<\/p>

    • Manufacturing Techniques: Hot-rolled, Cold-drawn<\/li>
    • Standard: ASTM A268, GB\/T 14976, JIS G3468, etc<\/li>
    • Outside Diameter: \u03a66-\u03a6630mm<\/li>
    • Wall Thickness: 0.5-30mm, SCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXS, SCH XS<\/li>
    • Surface: Pickled, polished, shot-blasted,or as required<\/li>
    • Process Service: Forging, Finishing, Destructive Testing, Heat Treating, Machining, Annealed<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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      \n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"stainless\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
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      \n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"409L\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
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      409L Stainless Steel Seamless Pipe Feature<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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      With 15+ years of experience, JBLSTEEL factory directly supplies 409L stainless steel seamless pipes. Featuring a titanium-stabilized, low-carbon design, these tubes withstand high-temperature oxidation up to 650\u00b0C. The cost is 35% lower than 304 stainless steel, and the seamless manufacturing process eliminates the risk of weld defects, making them more reliable in high-pressure and high-temperature environments.<\/p>

      • Cost-effective alternative to 304\/316 (reduces procurement costs by 10\u201330%)<\/li>
      • Excellent resistance to thermal oxidation<\/li>
      • Superior resistance to thermal fatigue<\/li>
      • Suitable for mass-production industrial applications (especially in the automotive industry)<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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        Compared to other types of stainless steel, 409L stainless steel excels in high-temperature resistance and machinability, rather than prioritizing maximum corrosion resistance.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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        Good Heat Resistance:<\/strong><\/p>

        It maintains its strength in high-temperature environments around 800\u00b0C, making it particularly suitable for high-temperature components in automotive exhaust systems.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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        Excellent Workability:<\/strong><\/p>

        It offers good formability after heat treatment (at 770\u2013830\u00b0C), making it suitable for deep drawing, bending, and stamping.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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        Excellent Weldability:<\/strong><\/p>

        The low carbon content significantly reduces the risk of intergranular corrosion, allowing for use without post-weld heat treatment, and requiring minimal heat input during welding.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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        Cost Benefits:<\/strong><\/p>

        As a non-alloy steel, it has relatively low production costs and a stable composition.<\/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

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        Stainless Steel 409L Vs 304\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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        Properties<\/b><\/td>409L<\/b><\/td>304<\/b><\/td><\/tr>
        Corrosion Resistance<\/td>Moderate<\/td>Excellent<\/td><\/tr>
        High-Temperature Resistance<\/td>Excellent (suitable for exhaust systems)<\/td>Moderate<\/td><\/tr>
        Cost<\/td>Low<\/td>High<\/td><\/tr>
        Strength<\/td>Moderate<\/td>Moderate<\/td><\/tr>
        Magnetic Properties<\/td>Magnetic<\/td>Non-magnetic<\/td><\/tr><\/tbody><\/table>

        If the project environment requires excellent corrosion resistance, 304 is recommended.<\/p>

        If the project budget is limited and the operating environment is at high temperatures, 409L is the best choice.<\/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

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        409L Stainless Steel Chemical Composition \n\n<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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        Grade<\/th>C<\/th>Mn<\/th>Si<\/th>P<\/th>S<\/th>Cr<\/th>Ti<\/th>Ni<\/th><\/tr>
        SS 409L<\/td>0.03 max<\/td>1.00 max<\/td>1.00 max<\/td>0.04 max<\/td>0.02 max<\/td>11.75-10.5<\/td>0.75-6(C+N)<\/td>0.5<\/td><\/tr><\/tbody><\/table>
        • Low-carbon design effectively reduces the risk of intergranular corrosion and ensures corrosion resistance after welding.<\/li><\/ul>\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
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          Mechanical Properties\n<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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          Density<\/th>Tensile Strength<\/th>Yield Strength (0.2%Offset)<\/th>Elongation<\/th>Rockwell B (HRB) max<\/th>Brinell (HB) max<\/th>Hardness<\/th><\/tr>
          7.8 g\/cm3<\/sup><\/td>MPa \u2013 380<\/td>MPa \u2013 170<\/td>20 %<\/td>75<\/td>131<\/td>

          Rockwell B (HR B)- 88\u00a0<\/p>

          Brinell (HB)- 0.5t<\/p><\/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

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          409L Stainless Steel Tube Application<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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          Automotive exhaust systems:<\/strong><\/p>

          This is its primary application, including exhaust manifolds, catalytic converter housings, mufflers, and exhaust pipe.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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          Heat exchangers:<\/strong><\/p>

          Used in heat exchange components for water-cooled or oil-cooled systems.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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          Construction and other applications:<\/strong><\/p>

          Such as ventilation ducts and container components.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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          Compared to austenitic stainless steels such as 304, 409 stainless steel has lower corrosion resistance (unsuitable for strong acid or strong alkali environments); however, its oxidation resistance and high-temperature strength in automotive exhaust systems make it the optimal choice.<\/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\t\t<\/div>","protected":false},"excerpt":{"rendered":"

          409L stainless steel seamless pipe is a low-carbon ferritic stainless steel, also known as heat-resistant steel, offering excellent oxidation resistance and weldability. Seamless pipes are manufactured through hot-rolling or cold-drawing processes; the seamless construction makes it more reliable in high-pressure and high-temperature environments.<\/p>\n

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          • Cost-effective alternative to 304\/316 (reduces procurement costs by 10\u201330%)<\/li>\n
          • Excellent resistance to thermal oxidation<\/li>\n
          • Superior resistance to thermal fatigue<\/li>\n
          • Suitable for mass-production industrial applications (especially in the automotive industry)<\/li>\n<\/ul>","protected":false},"featured_media":2528,"template":"","meta":{"_eb_attr":""},"product_brand":[],"product_cat":[30],"product_tag":[],"class_list":["post-2536","product","type-product","status-publish","has-post-thumbnail","product_cat-stainless-steel-seamless-pipe","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/jblstainless.com\/zh\/wp-json\/wp\/v2\/product\/2536","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jblstainless.com\/zh\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/jblstainless.com\/zh\/wp-json\/wp\/v2\/types\/product"}],"version-history":[{"count":6,"href":"https:\/\/jblstainless.com\/zh\/wp-json\/wp\/v2\/product\/2536\/revisions"}],"predecessor-version":[{"id":2542,"href":"https:\/\/jblstainless.com\/zh\/wp-json\/wp\/v2\/product\/2536\/revisions\/2542"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/jblstainless.com\/zh\/wp-json\/wp\/v2\/media\/2528"}],"wp:attachment":[{"href":"https:\/\/jblstainless.com\/zh\/wp-json\/wp\/v2\/media?parent=2536"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/jblstainless.com\/zh\/wp-json\/wp\/v2\/product_brand?post=2536"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/jblstainless.com\/zh\/wp-json\/wp\/v2\/product_cat?post=2536"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/jblstainless.com\/zh\/wp-json\/wp\/v2\/product_tag?post=2536"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}