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发明公开
CN108441771A 一种690MPa级别调质高强度钢板及其生产方法 无效 - 撤回

一种690MPa级别调质高强度钢板及其生产方法
摘要：
本发明公开了一种690MPa级别调质高强度钢板及其生产方法，钢板化学成分组成及质量百分含量为：C：0.18～0.22%、Si：0.20～0.40%、P≤0.025%、S≤0.015%、Mn：1.7～2.2%、N：0.0060～0.0120%、V：0.090～0.12%、B：0.003～0.005%，其余为Fe和不可避免的杂质元素；生产方法包括冶炼、加热、轧制、冷却、缓冷、调质热处理工序；所述调质工序，采用淬火+回火工艺。本发明钢板组织类型为回火索氏体+回火马氏体，钢板屈服强度Rp0.2≥670MPa、抗拉强度Rm≥730MPa、A50≥20%、-20℃横向冲击功≥80J、表面硬度HB≥360。
摘要（英）：

The invention discloses a 690MPa-grade quenched and tempered high-strength steel plate and a production method of the 690MPa-grade quenched and tempered high-strength steel plate. According to the chemical components, the 690MPa-grade quenched and tempered high-strength steel plate comprises, by mass percentage, 0.18%-0.22% of C, 0.20%-0.40% of Si, smaller than or equal to 0.025% of P, smaller than or equal to 0.015% of S, 1.7%-2.2% of Mn, 0.0060%-0.0120% of N, 0.090%-0.12% of V, 0.003%-0.005% of B and the balance Fe and inevitable impurity elements. The production method comprises the steps of a smelting working procedure, a heating working procedure, a rolling working procedure, a cooling working procedure, a slow cooling working procedure and a quenching and tempering thermal treatmentworking procedure, wherein a quenching and tempering technology is adopted by the quenching and tempering thermal treatment working procedure. According to the 690MPa-grade quenched and tempered high-strength steel plate and the production method of the 690MPa-grade quenched and tempered high-strength steel plate, the organization type of the steel plate is tempered sorbite and tempered martensite, the yield strength Rp0.2 of the steel plate is larger than or equal to 670MPa, the tensile strength Rm is larger than or equal to 730MPa, A50 is larger than or equal to 20%, the -20 DEG C transverseimpact energy is larger than or equal to 80J, and the surface hardness HB is larger than or equal to 360.

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