800mpa grade hydroelectric steel and method of manufacture

Abstract

The application relates to an 800MPa-grade hydropower steel and a preparation method, and belongs to the technical field of steel manufacturing. The chemical components of the hydropower steel are as follows in mass fraction: C: 0.07%-0.12%, Si: 0.01%-0.50%, Mn: 0.70%-1.45%, P<=0.015%, S<=0.005%, Nb: 0.01%-0.05%, V: 0.01%-0.05%, Ti: 0.01%-0.05%, Cr: 0.01%-0.50%, Ni: 0.50%-1.50%, Cu: 0.01%-0.30%, B: 0.001%-0.004%, Mo: 0.01%-0.60%, and the rest is Fe and inevitable impurities. The micro-alloying component system of the hydropower steel is optimized through a component automatic design system, and in combination with a full-process collaborative process of continuous casting billet solidification end deformation, controlled rolling and controlled cooling and quenching and tempering heat treatment, various process parameters are linked and adjusted, so that the core density and structure uniformity of the hydropower steel are improved. A quality judgment system innovatively developed performs multi-index comprehensive judgment on the hydropower steel after tempering, and ensures that the hydropower steel has super-high strength, excellent low-temperature toughness, strain aging resistance and layer tearing resistance, fully meets the strict performance requirements of a hydropower station rib plate, and provides a complete innovative solution for efficient and stable production of the hydropower steel.

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