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|1. (WO2018036348) THIN THERMOFORMED STEEL DIRECTLY ROLLED USING THIN SLABS AND HAVING TENSILE STRENGTH OF ≥1500 MPA, AND METHOD FOR PRODUCING SAME|
|Applicants:||WUHAN IRON AND STEEL COMPANY LIMITED
|Title:||THIN THERMOFORMED STEEL DIRECTLY ROLLED USING THIN SLABS AND HAVING TENSILE STRENGTH OF ≥1500 MPA, AND METHOD FOR PRODUCING SAME|
Provided is a thin thermoformed steel directly rolled using thin slabs and having tensile strength of ≥1500 MPa, having a component wt% of C: 0.21-0.25%, Si: 0.26-0.30%, Mn: 1.0-1.3%, P≤0.01%, S≤0.005%, Als: 0.015-0.060%, Cr: 0.25-0.30%, Ti: 0.026-0.030% or Nb: 0.026-0.030% or V: 0.026-0.030%, or a mixture of two or more of the above in any proportion; B: 0.003-0.004%, and N≤0.005%. Production steps: hot metal desulfurisation; electric-furnace or converter smelting and refining; continuous casting; descaling, then entering a soaking pit; soaking; heating; high-pressure water descaling, then entering a rolling mill; rolling; cooling; coiling; austenitizing; die stamping; quenching. The process of the method is short, the quality of the surface of the product is good, and thickness and precision are high, thus satisfying the quality requirements of cold-rolled products; complicated deformation is successfully accomplished and there is no rebound after deformation, and the precision of sizing components is high.