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1.发明授权
公开(公告)号：US4374682A
公开(公告)日：1983-02-22
申请号：US195654
申请日：1980-10-09
CPC分类号： C21D9/48 , C21D8/0473 , C21D8/0426 , C21D9/52
摘要： A process for producing a cold rolled steel strip having excellent workability by a short-time continuous annealing, which process is constituted by hot rolling a low carbon steel slab of steel having a carbon content of from about 0.003 to 0.08% into a steel strip; cold rolling the hot rolled steel strip; rapidly heating the cold rolled steel strip to a recrystallization temperature range at a heating rate not less than 40.degree. C./second; slowly heating the thus rapidly heated steel strip to an annealing temperature at a heating rate ranging from 5.degree. to 30.degree. C./second; annealing the thus slowly heated steel strip at an annealing temperature T which is no lower than 700.degree. C. and no higher than the A.sub.3 transformation temperature and for an annealing time t no shorter than [8-0.03 (T-680)] seconds and no longer than [80-0.15 (T-680)] seconds, initially slowly cooling the thus annealed steel strip at a cooling rate less than 50.degree. C./second, and then rapidly cooling the strip at a cooling rate not less than 50.degree. C./second from a temperature T.sub.Q ranging from higher than 600.degree. C. to no higher than [T-0.027 (T-680)(.sqroot.t+23.7)].degree. C. to an over-ageing temperature range; and subjecting the thus cooled steel strip to an over-ageing treatment at a temperature ranging from 300.degree. to 500.degree. C. for a period of time ranging from 10 seconds to 5 minutes.
摘要翻译： 一种通过短时间连续退火制造具有优异加工性的冷轧钢带的方法，该方法通过将碳含量为约0.003至0.08％的钢的低碳钢板坯热轧到钢带中而构成; 冷轧热轧钢带; 以不低于40℃/秒的加热速率将冷轧钢带快速加热至重结晶温度范围; 将这样快速加热的钢带缓慢加热至退火温度，加热速率范围为5℃至30℃/秒; 在不低于700℃，不高于A3转化温度的退火温度T和不低于[8-0.03（T-680）]秒的退火时间t退火如此缓慢加热的钢带，并且 不超过[80-0.15（T-680）]秒，最初以低于50℃/秒的冷却速率缓慢地冷却由此退火的钢带，然后以不小于50的冷却速率快速冷却带材 从高于600℃至不高于[T-0.027（T-680）（2ROOT t + 23.7）]℃的温度TQ至过老化温度范围; 并将这样冷却的钢带在300℃至500℃的温度范围内进行过时效处理10秒至5分钟的时间。
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