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发明授权
CN108193138B 980MPa级汽车用冷轧高强Q&P钢及其生产方法 有权

980MPa级汽车用冷轧高强Q&P钢及其生产方法
摘要：
一种980MPa级汽车用冷轧高强Q&P钢及其生产方法，属于钢铁生产技术领域。所述Q&P钢的成分重量百分比组成：C：0.18～0.24%，Si：0.60～1.30%，Mn：1.60～2.40%，P：0.02～0.04%，S≤0.005%，Nb：0.040～0.070%，N≤0.0060%，Als：0.50～1.0%，余量为Fe和不可避免的杂质。所述生产方法包括炼钢、加热、热轧、冷轧、连续退火和平整工序；所述连续退火工序的均热段保温温度770～840℃，过时效段保温温度300～440℃。本发明所得Q&P钢力学性能优良，屈服强度≥550MPa，抗拉强度≥980MPa，延伸率≥18%，冷成型性能良好。
摘要（英）：

The invention discloses 980MPa-grade automobile cold-rolled high-strength Q&P steel and a production method thereof, and belongs to the technical field of steel production. The Q&P steel comprises thefollowing components, by weight percentage: 0.18-0.24% of C, 0.60-1.30% of Si, 1.60-2.40% of Mn, 0.02-0.04% of P, less than or equal to 0.005% of S, 0.040-0.070% of Nb, less than or equal to 0.0060%of N, 0.50-1.0% of Als and the balance of Fe and inevitable impurities. The production method comprises the steps of carrying out steel-making, carrying out heating, carrying out hot rolling, carryingout cold rolling, carrying out continuous annealing and carrying out leveling, wherein the holding temperature of a soaking zone in the continuous annealing process is 770-840 DEG C, and the holdingtemperature of an overaging zone is 300-440 DEG C. The obtained Q&P steel has the advantages that the mechanical property is excellent, the yield strength is greater than or equal to 550MPa, the tensile strength is greater than or equal to 980MPa, the elongation percentage is greater than or equal to 18%, and the cold forming property is good.

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