公开(公告)号：US06190469B1

公开(公告)日：2001-02-20

申请号：US09101147

申请日：1998-07-01

申请人： Hyang Jin Koh ,  Nack Joon Kim ,  Sung Ho Park

发明人： Hyang Jin Koh ,  Nack Joon Kim ,  Sung Ho Park

IPC分类号： C21D1100

CPC分类号： C22C38/08 ,  C21D8/0226 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C22C38/16

摘要： A method for producing a high strength hot-rolled steel sheet with good formability applicable to automobiles, industrial machines and the like is disclosed. The basic composition of TRIP steel is adjusted wherein Cu is added to improve the strength by precipitation hardening of a fine &egr;—Cu. Other conditions are controlled to obtain a tensile strength of over 90 kg/mm2 with good formability. The steel is composed of 0.15-0.3% by weight of C, 1.5-2.5% by weight of Si, 0.6-1.8% by weight of Mn, 0.02-0.10% by weight of Al, 0.6-2.0% by weight of Cu, 0.6-2.0% by weight of Ni, the balance being Fe and inevitable impurities and has a microstructure of multi-phase structure consisting of ferrite, bainite, and retained austenite, or a granular structure (M-A constituents in bainitic ferrite matrix). The steel is finish rolled at a temperature of 750-880° C., water cooled from a water cooling initiation temperature of 680-740° C. to a water cooling termination temperature of 240×(% Mn+% Ni)−140 (° C.) to 540° C., and subsequently coiled at this temperature.

摘要翻译： 公开了一种制造具有适用于汽车，工业机械等的良好成形性的高强度热轧钢板的方法。 调整TRIP钢的基本组成，其中加入Cu以通过精细的epsi-Cu的沉淀硬化来提高强度。 控制其它条件以获得超过90kg / mm 2的抗拉强度，并且具有良好的成形性。 该钢由C：0.15〜0.3重量％，Si：1.5〜2.5重量％，Mn：0.6〜1.8重量％，Al：0.02〜0.10重量％，Cu：0.6〜2.0重量％ 0.6-2.0重量％的Ni，余量为Fe和不可避免的杂质，并且具有由铁素体，贝氏体和残留奥氏体组成的多相结构的微观结构，或粒状结构（贝氏体铁素体基体中的MA成分）。 钢在750-880℃的温度下进行精轧，水冷却起始温度为680-740℃，水冷终止温度为240x（％Mn +％Ni）-140（℃） 。）至540℃，随后在该温度下盘绕。