High yield strength DH500 steel plate for offshore platform

1. DH500 steel plate is classified as ultra-high-strength ship and marine structural steel plate. Judging from the development of higher-strength ship plates in the world today, low-carbon equivalent, microalloying, controlled rolling and controlled cooling, heat treatment and other process technologies are widely used. The participation of microalloying elements can not only improve the strength, compensate for the strength loss caused by the reduction of carbon equivalent, and improve the welding performance, mechanical properties and process performance of the steel. Because of the high-strength ship plate application environment requirements of DH500 steel plate, it can meet the requirements of high strength, high toughness, high welding performance, and thickness direction performance.

2. DH500 steel plate heat treatment and performance specifications:
Heat treatment: TMCP, quenching and tempering, TMCP+ tempering, Z25 or Z35 can be selected. Flaw detection specification requirements, flaw detection level requirements, Z-direction performance requirements, classification society certification requirements, and requirements for adding special alloy elements, etc. Performance specification: GB 712.

3. Chemical composition of DH500 steel plate (melting analysis %):
Steel plate trademark: DH500 steel plate
C≤0.20; Si≤0.55; Mn≤1.70; P≤0.25; S≤0.25; N≤0.020.

4. Mechanical properties of DH500 steel plate:
Steel plate trademark: DH500 steel plate;
Yield strength≥500; Tensile strength 610-770; Elongation%:≥16;
Experimental temperature/℃: -40; impact energy Akv/J longitudinal direction: C ≥50;

5. DH500 steel plate production process:
The steel is tempered by a converter or an electric furnace, and if necessary, the essence of the furnace can be carried out. The Z-direction steel plate shall be subjected to ultrasonic flaw detection, and the flaw detection level shall be indicated.

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