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    • 1. 发明授权
    • Method of producing a high strength steel having uniform elongation
    • 制造具有均匀伸长率的高强度钢的方法
    • US4033789A
    • 1977-07-05
    • US668374
    • 1976-03-19
    • Emil G. HamburgRobert L. CrydermanJohn F. Butler
    • Emil G. HamburgRobert L. CrydermanJohn F. Butler
    • C22C38/00C21D6/00C21D8/02C21D7/14
    • C21D8/0226C21D2211/002C21D2211/005C21D2211/008C21D8/0263
    • A steel product having a combination of high strength and formability (as measured by percent tensile uniform elongation) is produced by austenitizing a steel consisting essentially of from 0.04 to 0.17% carbon, 0.8 to 2.0% manganese, up to 1.0% silicon, up to 0.12% vanadium, up to 0.1% columbium, up to an effective amount of titanium to form titanium carbonitrides, 0.001 to 0.025% nitrogen, balance essentially iron and then cooling at a rate of no more than about 70.degree. F/sec. to about 850.degree. F and at a rate of more than about 10.degree. F/sec. to transform the freshly formed austenite to a microstructure of from 10 to 35% by volume of martensite and/or lower bainite (MLB), balance essentially proeutectoid ferrite. Slower cooling rates may be employed to obtain the desired microstructure if a restricted chemical composition is used. The heat-treated steel product is characterized by an ultimate tensile strength of 80,000 p.s.i. minimum and a uniform elongation of 16% minimum.
    • 具有高强度和成形性的组合(通过拉伸均匀伸长率测定)的钢产品通过将基本上由0.04至0.17%的碳,0.8至2.0%的锰,至多1.0%的硅组成的钢进行奥氏体化,直至 0.12%的钒,至多0.1%的铌,至有效量的钛,形成钛碳氮化物,0.001至0.025%的氮,余量基本上为铁,然后以不超过约70°F /秒的速率冷却。 至约850°F和大于约10°F /秒的速率。 将新形成的奥氏体转变成10〜35体积%的马氏体和/或下贝氏体(MLB)的微观结构,平衡本质上为先共析铁素体。 如果使用有限的化学组成,可以采用较慢的冷却速率来获得所需的微结构。 热处理钢产品的特点是极限拉伸强度为80,000 p.s.i。 最小和均匀伸长率最小为16%。