{"id":3740,"date":"2026-07-20T15:54:05","date_gmt":"2026-07-20T07:54:05","guid":{"rendered":"https:\/\/jblstainless.com\/?post_type=product&p=3740"},"modified":"2026-07-20T16:20:10","modified_gmt":"2026-07-20T08:20:10","slug":"q690-steel-plate-q690c-q690d-q690e-q690cfd","status":"publish","type":"product","link":"https:\/\/jblstainless.com\/fa\/q690-steel-plate-q690c-q690d-q690e-q690cfd\/","title":{"rendered":"Q690 Steel Plate Q690C Q690D Q690E Q690CFD"},"content":{"rendered":"\t\t
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Q690 Steel Plate, Q690C, Q690D, Q690E, Q690CFD. The thicker the plate, the higher the processing difficulty and cost, and the price will rise accordingly.Q690 High-strength Plate\u00a0belongs to low-alloy high-strength structural steel, with a yield strength of 690 MPa. It features high toughness, resistance to fatigue and corrosion resistance.<\/p>

When comparing quotations, it is necessary to comprehensively consider the material standards, delivery cycle and after-sales service, as well as the balance between material performance and cost. Only in this way can you select a Q690 Steel Plate with high cost-effectiveness!<\/p>

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Q690 Steel Plate –\u00a0 Differences in Designations<\/span><\/p>
mark<\/th>executive standard<\/th>

Suffix meaning\/Key features<\/p><\/div><\/th>

Suffix meaning\/Key features<\/p><\/div><\/th>

Typical delivery conditions and processes<\/th>Core application scenarios<\/th><\/tr><\/thead>
\u200cQ690B<\/strong>\u200c<\/td>GB\/T 1591-2018<\/td>B= Normal temperature grade, with no mandatory requirement for low-temperature toughness<\/td>20\u2103(At room temperature)<\/td>Hot rolling\/controlled rolling<\/td>General normal temperature structure, not in extremely cold regions<\/td><\/tr>
\u200cQ690C<\/strong>\u200c<\/td>GB\/T 1591-2018<\/td>C=Low-temperature toughness at 0\u2103<\/td>0\u2103<\/td>Controlled rolling\/quenching and tempering<\/td>Mechanical structure in a mild low-temperature environment<\/td><\/tr>
\u200cQ690D<\/strong>\u200c<\/td>GB\/T 1591-2018<\/td>D=-20\u2103 low-temperature toughness, general-purpose high-strength steel<\/td>-20\u2103<\/td>Controlled rolling (TMCP) or quenching and tempering<\/td>Construction machinery, cold region Bridges, general heavy-duty equipment<\/td><\/tr>
\u200cQ690E<\/strong>\u200c<\/td>GB\/T 1591-2018<\/td>E=-40\u2103 deep low-temperature toughness<\/td>-40\u2103<\/td>Quenching and tempering (QT) is the main approach<\/td>Extremely cold regions, mining equipment, key load-bearing components<\/td><\/tr>
\u200cQ690F<\/strong>\u200c<\/td>GB\/T 1591-2018<\/td>F=Ultra-deep low-temperature toughness at -60\u2103<\/td>-60\u2103<\/td>Tempering (QT)<\/td>Special extremely cold working conditions (less common)<\/td><\/tr>
\u200cS690Q<\/strong>\u200c<\/td>EN 10025-6

ABELL<\/p><\/td>

Q=Quenching + tempering for quenched and tempered structure, for export\/foreign-related mainstream products<\/td>-20\u2103 (Lateral dimension \u2265 30 mm)<\/td>Mandatory quenching and tempering (Q + T)<\/td>Export machinery, EU standard projects, precision structures<\/td><\/tr>
\u200cQ690CFD<\/strong>\u200c<\/td>GB\/T 28415-2022<\/td>

C=0\u2103, F= fire resistance, D=Z35 resistance to layered tearing<\/p><\/div>

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0\u2103 + Fire-resistant + Z-direction<\/td>Quenching and tempering + refining vacuum degassing<\/td>Key nodes for fire-resistant structures of high-rise buildings and thick plate welding<\/td><\/tr><\/tbody><\/table>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Can the national standard Q690D be directly substituted for the European standard S690Q?<\/span><\/p>

Cannot be directly interchanged<\/p>

What are the differences between the quality grades of Q690 high-strength structural steel?<\/span><\/p>

Only by changing the qualified temperature threshold of the low-temperature impact energy, from the normal temperature of 20\u2103 to gradually decrease to -60\u2103, the strength indicators remain basically the same, but the E\/F grades have higher requirements for purity and finer grain size.<\/p>

Q690 Main Chemical Components<\/span><\/p>