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。

公开(公告)号：US4619714A

公开(公告)日：1986-10-28

申请号：US676066

申请日：1984-11-29

申请人： Gareth Thomas ,  Jae-Hwan Ahn ,  Nack-Joon Kim

发明人： Gareth Thomas ,  Jae-Hwan Ahn ,  Nack-Joon Kim

IPC分类号： C21D1/18 ,  C21D8/02 ,  C21D8/06 ,  C21D7/14 ,  C21D7/10

CPC分类号： C21D8/06 ,  C21D8/0226 ,  C21D1/185 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008

摘要： An improved, energy efficient, hot rolling method for direct production of cold formable dual-phase steel is provided. The steel is heated to completely austenitize it and then continuously hot rolled and cooled down into the ferrite-austenite two phase region to a temperature which is just below the effective Ar.sub.3 temperature. The hot rolled steel is then rapidly quenched to provide an alloy containing strong, tough lath martensite (fibers) in a ductile soft ferrite matrix. The method is particularly useful for providing rods in which form the alloy is capable of being drawn into high strength wire or the like in a cold drawing operation without any intermediate annealing or patenting, and has excellent strength, ductility and fatigue characteristics.

摘要翻译： 提供了一种用于直接生产可冷成型双相钢的改进的节能型热轧方法。 将钢加热至完全奥氏体化，然后连续热轧并冷却至铁素体 - 奥氏体两相区域，达到刚好低于有效Ar 3温度的温度。 然后将热轧钢板快速淬火，以提供在延性软铁素体基体中含有强韧钢板马氏体（纤维）的合金。 该方法特别可用于提供在不进行任何中间退火或授权的情况下在冷拉拔操作中将合金拉制成高强度线等的棒，并且具有优异的强度，延展性和疲劳特性。