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1. (WO2018036347) THERMOFORMING STEEL ROLLED DIRECTLY FROM MEDIUM THIN SLAB AND HAVING TENSILE STRENGTH GREATER THAN OR EQUAL TO 1500 MPA AND PRODUCTION METHOD

Pub. No.:    WO/2018/036347    International Application No.:    PCT/CN2017/095493
Publication Date: Fri Mar 02 00:59:59 CET 2018 International Filing Date: Wed Aug 02 01:59:59 CEST 2017
IPC: C22C 38/12
C21D 8/02
Applicants: WUHAN IRON AND STEEL COMPANY LIMITED
武汉钢铁有限公司
Inventors: MAO, Xinping
毛新平
HU, Kuanhui
胡宽辉
WANG, Shuize
汪水泽
PAN, Libo
潘利波
GE, Rui
葛锐
LI, Lijun
李立军
PENG, Tao
彭涛
DU, Xiaofeng
杜晓峰
FANG, Fang
方芳
Title: THERMOFORMING STEEL ROLLED DIRECTLY FROM MEDIUM THIN SLAB AND HAVING TENSILE STRENGTH GREATER THAN OR EQUAL TO 1500 MPA AND PRODUCTION METHOD
Abstract:
Thermoforming steel rolled directly from a medium thin slab and having tensile strength greater than or equal to 1500 MPa, comprising the following components (weight%): 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 any two or more of the above in any proportion, B: 0.003%-0.004%, Mo: 0.17-0.19% and N≤0.005%. Production steps comprise: molten iron desulphurization; smelting and refining by an electric furnace or converter; continuous casting; descaling treatment before entering a soaking pit; soaking; heating; high pressure water descaling before entering a rolling mill; rolling; cooling; coiling; austenitizing; mold stamping forming; and quenching. The production process of the present invention is short, surface quality thereof is good, and thickness precision is high; quality requirements for cold-rolled products may be met, and complex deformation may be smoothly completed; moreover, no resilience is present after deformation, and dimensional accuracy of parts is high.