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发明公开
CN107829030A 一种440MPa级冷轧带钢及其生产方法 无效 - 驳回

一种440MPa级冷轧带钢及其生产方法
摘要：
本发明公开了一种440MPa级冷轧带钢及其生产方法，应用于带钢生产领域，该方法包括：对连铸板坯以加热温度1200～1250℃进行加热，以得到加热后板坯，其中，连铸板坯的化学成分的质量百分数如下：C：0.003％～0.009％、Si：0.08％～0.12％、Mn：1.4％～1.65％、P：0.08％～0.10％、S：≤0.003％、Alt：0.025％～0.035％，其余为铁和不可避免的杂质元素；对加热后板坯进行热轧，以形成热轧后带钢，控制热轧过程的终轧温度为840～900℃；对热轧后带钢进行卷取，控制卷取温度为580～620℃；对卷取后带钢进行酸洗后冷轧，以形成冷轧后带钢；将冷轧后带钢在退火炉内进行退火处理；对退火后带钢进行平整。本发明使得抗拉强度达到440MPa，并具有优异的成型性能，进而能够获得高质量的含P高强IF钢。
摘要（英）：

The invention discloses 440 MPa-grade cold-rolled strip steel and a production method thereof, and belongs to the field of strip steel production. The method comprises the following steps: heating continuously cast plate blank at a heating temperature of 1200-1250 DEG C to obtain heated plate blank, wherein the continuously cast plate blank consists of the following chemical components in percentage by mass: 0.003%-0.009% of C, 0.08%-0.12% of Si, 1.4%-1.65% of Mn, 0.08%-0.10% of P, less than or equal to 0.003% of S, 0.025%-0.035% of Alt, and the balance of iron and inevitable impurity elements; performing hot rolling on the heated plate blank to form hot-rolled strip steel, and controlling a final rolling temperature of a hot-rolling process to be 840-900 DEG C; rolling the hot-rolled strip steel, and controlling a rolling temperature to be 580-620 DEG C; performing cold rolling on the rolled strip steel after pickling to form cold-rolled strip steel; annealing the cold-rolled strip steel in an annealing furnace; and flattening the annealed strip steel. The 440 MPa-grade cold-rolled strip steel has tensile strength of 440 MPa, and has excellent forming performances, so that high-quality P-containing high-strength IF steel can be obtained.

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