公开(公告)号：US4544419A

公开(公告)日：1985-10-01

申请号：US627839

申请日：1984-07-05

Applicant: Toshio Irie ,  Susumu Sato ,  Osamu Hashimoto

Inventor： Toshio Irie ,  Susumu Sato ,  Osamu Hashimoto

IPC: C21D8/04 ,  C22C38/12

CPC classification number: C21D8/0426 ,  C22C38/12 ,  C21D8/0473 ,  Y10T428/12799

Abstract: The present invention provides high tensile strength cold rolled steel sheets having excellent formability, which consist of 0.002-0.015% of C, not more than 1.2% of Si, 0.04-0.8% of Mn, 0.03-0.10% of P, 0.02-0.10% and not less than N%.times.4 of Al, C%.times.3-{C%.times.8+0.020%} of Nb and the remainder being substantially Fe, as the high tensile strength steel sheets which reduce the weight of automobiles and the like. The steel sheet is produced by hot rolling a steel slab having the above described composition to obtain a hot rolled coil, in the hot rolling the total reduction rate being at least 90%, the rolling speed in the finishing rolling being at least 40 m/min and the coiling-up temperature being at least 600.degree. C.; cold rolling the above described hot rolled coil in a conventional process to obtain a cold rolled steel strip having a final gauge; subjecting the above described cold rolled steel strip to a continuous annealing at a temperature of 700.degree.-900.degree. C. for 10 sec-5 min and then cooling the annealed strip to 500.degree. C. at a rate of at least 60.degree. C./min. The steel sheets having the above described composition, except that Si is not more than 0.5%, are suitable for the continuous hot-dip galvanizing.

公开(公告)号：US4473414A

公开(公告)日：1984-09-25

申请号：US328578

申请日：1981-11-27

Applicant: Toshio Irie ,  Susumu Sato ,  Osamu Hashimoto

Inventor： Toshio Irie ,  Susumu Sato ,  Osamu Hashimoto

IPC: C21D8/04 ,  C22C38/12

CPC classification number: C21D8/0426 ,  C22C38/12 ,  C21D8/0473 ,  Y10T428/12799

Abstract: The present invention provides high tensile strength cold rolled steel sheets having excellent formability, which consist of 0.002-0.015% of C, not more than 1.2% of Si, 0.04-0.8% of Mn, 0.03-10% of P, 0.02-0.10% and not less than N%.times.4 of Al, C%.times.3-{C%.times.8+0.020%} of Nb and the remainder being substantially Fe, as the high tensile strength steel sheets which reduce the weight of automobiles and the like. The steel sheet is produced by hot rolling a steel slab having the above described composition to obtain a hot rolled coil, in the hot rolling the total reduction rate being at least 90%, the rolling speed in the finishing rolling being at least 40 m/min and the coiling-up temperature being at least 600.degree. C.; cold rolling the above described hot rolled coil in a conventional process to obtain a cold rolled steel strip having a final gauge; subjecting the above described cold rolled steel strip to a continuous annealing at a temperature of 700.degree.-900.degree. C. for 10 sec-5 min and then cooling the annealed strip to 500.degree. C. at a rate of at least 60.degree. C./min. The steel sheets having the above described composition, except that Si is not more than 0.5%, are suitable for the continuous hot-dip galvanizing.

Abstract translation: PCT No.PCT / JP81 / 00068 Sec。 371日期：1981年11月27日 102（e）1981年11月27日PCT PCT Fils 3月30日PCT公布。 出版物WO81 / 02900 1981年10月15日。本发明提供具有优异成形性的高抗拉强度冷轧钢板，其由C 0.002-0.015％，不超过1.2％的Si，0.04-0.8％的Mn，0.03-10 作为降低重量的高抗拉强度钢板，P的0.02％〜100％，不小于Al的N％x4，C％x3-（C％×8 + 0.020％）Nb，余量基本上为Fe 的汽车等。 通过对具有上述组成的钢板进行热轧来制造钢板，得到热轧板卷，在热轧中，总压下率为90％以上，精轧的轧制速度为40m / min，卷取温度为600℃以上。 在常规方法中冷轧上述热轧卷材，得到具有最终规格的冷轧钢带; 将上述冷轧钢带在700-900℃的温度下连续退火10分钟-5分钟，然后以至少60℃的速率将退火的钢带冷却至500℃。 /分钟 具有上述组成的钢板，除了Si不大于0.5％，适用于连续热浸镀锌。

公开(公告)号：US4339284A

公开(公告)日：1982-07-13

申请号：US212724

申请日：1980-10-27

Applicant: Osamu Hashimoto ,  Susumu Sato ,  Tomoo Tanaka

Inventor： Osamu Hashimoto ,  Susumu Sato ,  Tomoo Tanaka

IPC: C22C38/00 ,  C21D8/02 ,  C21D9/48 ,  C22C38/12 ,  C21D8/04

CPC classification number: C21D9/48 ,  C22C38/12

Abstract: A method of producing substantially non-ageing cold rolled steel sheets having a remarkably excellent deep drawing property, wherein an extra low-carbon steel is melted together with niobium in an amount of less than the necessary amount for fixing completely carbon contained in the extra low-carbon steel to prepare a molten steel, the molten steel is made into an ingot and then the ingot is slabbed, or the molten steel is continuously cast to produce a slab, the slab is subjected to a hot rolling and a cold rolling to produce a cold rolled sheet according to an ordinary method, and the cold rolled sheet is subjected to a box annealing.

Abstract translation: PCT No.PCT / JP80 / 00032 Sec。 371日期1980年10月27日第 102（e）1980年10月27日PCT申请日1980年2月27日PCT公布 出版物WO80 / 01811 日本1980年9月4日。一种制造具有非常优异的深冲性能的基本上非时效的冷轧钢板的方法，其中超低碳钢与铌熔融量小于固定所需的量 完全碳包含在额外的低碳钢中以制备钢水，将钢水制成锭，然后将铸锭板坯，或者钢水连续铸造以生产板坯，使板坯受热 轧制和冷轧以根据常规方法制造冷轧板，并且对冷轧板进行箱式退火。