公开(公告)号：US4391653A

公开(公告)日：1983-07-05

申请号：US302450

申请日：1981-09-15

Applicant: Hiroshi Takechi ,  Hiroshi Katoh ,  Kazuo Koyama ,  Kazuhide Usami

Inventor： Hiroshi Takechi ,  Hiroshi Katoh ,  Kazuo Koyama ,  Kazuhide Usami

IPC: C22C38/00 ,  B21B3/02 ,  C21D8/02 ,  C21D8/04 ,  C21D9/46

CPC classification number: C21D9/46 ,  B21B3/02 ,  C21D8/0436 ,  C21D8/0426 ,  C21D8/0473

Abstract: A high strength cold rolled strip having excellent deep drawability and resistance to deterioration by natural aging and to planar cracking and useful for motor vehicles, is produced by hot rolling a steel slab comprising0.008-0.020% by weight of C,0.01-0.45% by weight of Mn,0.05-0.10% by weight of P,0.005-0.050% by weight of acid-soluble Al,and the balance consisting of Fe and unavoidable impurities in which N is limited to a content of 40 ppm or less, at a temperature of 1200.degree. C. or less but not lower than the Ar.sub.3 point of the steel slab; by cold rolling the resultant steel strip at a rolling reduction of 65% or more; by continuously annealing the cold rolled steel strip at a temperature of from 700.degree. to 900.degree. C. for 20 seconds to 3 minutes; by cooling the steel strip at a cooling rate of 5.degree. C./sec or more; by overaging the annealed steel strip at a temperature of from 320.degree. to 450.degree. C. for 1 to 10 minutes; by cooling said overaged steel strip to the ambient temperature, and, finally; by temper-rolling the cooled steel strip at the ambient temperature.

Abstract translation: 通过将包含0.008-0.020重量％的C，0.01-0.45％的钢坯热轧在钢坯上，制造具有优异的深冲性和耐自然老化劣化和平面裂纹并且适用于机动车辆的高强度冷轧带 Mn重量为0.05-0.10％，P为0.005-0.050％（重量），余量由Fe和不可避免的杂质组成，其中N被限制在40ppm以下的含量 温度在1200℃以下但不低于钢坯的Ar3点; 通过在65％以上的压下率下冷轧得到的钢带; 通过在700〜900℃的温度下连续退火冷轧钢带20秒〜3分钟; 通过以5℃/秒以上的冷却速度冷却钢带; 通过在320℃至450℃的温度下对退火的钢带进行1至10分钟的老化处理; 通过将所述过时的钢带冷却至环境温度，最后; 通过在环境温度下冷却冷却的钢带。