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    • 3. 发明授权
    • Hot-rolled steel sheet and method for forming hot-rolled steel sheet
having low yield ratio, high strength and excellent toughness
    • 热轧钢板和成品率低,强度高,韧性优异的热轧钢板的制造方法
    • US5948183A
    • 1999-09-07
    • US947388
    • 1997-10-08
    • Susumu OkadaMasahiko MoritaFumimaru Kawabata
    • Susumu OkadaMasahiko MoritaFumimaru Kawabata
    • C21D8/02C22C38/02C22C38/04C22C38/12C22C38/14
    • C22C38/04C21D8/0226C22C38/02C22C38/12C22C38/14C21D2211/002C21D2211/005
    • The present invention provides a hot-rolled steel sheet having a low yield ratio, a high specific strength, and excellent toughness. The hot-rolled steel sheet comprises: 0.005 to less than 0.030 weight percent of carbon, 1.5 weight percent or less of silicon, 1.5 weight percent or less of manganese, 0.020 weight percent or less of phosphorus, 0.015 weight percent or less of sulfur, 0.005 to 0.10 weight percent of aluminum, 0.0100 weight percent or less of nitrogen, 0.0002 to 0.0100 weight percent of boron, at least one element selected from the group consisting of 0.20 weight percent or less of titanium and 0.25 weight percent or less of niobium in an amount to satisfy (Ti+Nb/2)/C.gtoreq.4, and balance iron and incidental impurities. The metal structure is selected from the group consisting of ferrite and bainitic ferrite. The amount of carbon dissolved in grains ranges from 1.0 to 4.0 ppm. The present invention also provides a method for producing a hot-rolled steel sheet. The method includes hot-rolling a steel slab containing the above components, cooling at a rate of between 5 to not more than 20.degree. C./sec., and then coiling at a temperature ranging from over 550.degree. C. to 700.degree. C.
    • 本发明提供一种低屈服比,高比强度,优异的韧性的热轧钢板。 该热轧钢板包括:0.005〜小于0.030重量%的碳,1.5重量%以下的硅,1.5重量%以下的锰,0.020重量%以下的磷,0.015重量%以下的硫, 0.005〜0.10重量%的铝,0.0100重量%以下的氮,0.0002〜0.0100重量%的硼,至少一种选自钛的0.20重量%以下和0.25重量%以下的铌的元素 满足(Ti + Nb / 2)/ C> / = 4的量,并平衡铁和杂质。 金属结构选自铁素体和贝氏体铁素体。 溶解在谷物中的碳的量为1.0至4.0ppm。 本发明还提供一种热轧钢板的制造方法。 该方法包括对含有上述成分的钢板进行热轧,以不超过20℃/秒的速度冷却,然后在550℃〜700℃的温度下卷取 。
    • 10. 发明授权
    • Method of producing high-strength cold-rolled steel sheet suitable for
working
    • 生产适用于加工的高强度冷轧钢板的方法
    • US5279683A
    • 1994-01-18
    • US891685
    • 1992-05-29
    • Susumu OkadaTojiro IkedaSusumu SatohHideo AbeJun-ichi ManoNorio Ohta
    • Susumu OkadaTojiro IkedaSusumu SatohHideo AbeJun-ichi ManoNorio Ohta
    • C21D8/04
    • C21D8/0431C21D8/0436
    • A method of producing a high-strength cold-rolled steel sheet suitable for working uses which utilizes a steel material having the following composition: not more than 0.006 wt % of C, not more than 0.5 wt % of Si, not more than 2.0 wt % of Mn, and not less than 0.01 wt % but not more than 0.10 wt % of Ti, the Ti, C and N contents being determined to meet the condition of Ti>(48/12) C wt %+(48/14) N wt %, the steel also consisting essentially of not less than 0.0010 wt % but not more than 0.0100 wt % of Nb, not less than 0.0002 wt % but not more than 0.0020 wt % of B, not less than 0.03 wt % but not more than 0.20 wt % of P, not more than 0.03 wt % of S, not less than 0.010 wt % but not more than 0.100 wt % of Al, not more than 0.008 wt % of N, not more than 0.0045 wt % of O, and the balance substantially Fe and incidental inclusions. The steel material is cast and hot-rolled and then subjected to a cold rolling conducted at a sheet temperature not higher than 300.degree. C. under such a condition that the sum of the rolling reductions of passes which meet the following condition between said sheet temperature (T .degree.C.) and the strain rate .epsilon. (S-1) is 50% or greater:T.times..epsilon..gtoreq.50,000.degree. C. S.sup.-1The steel sheet is then continuously annealed or galvannealed.
    • 一种适用于使用具有以下组成的钢材的工作用高强度冷轧钢板的方法:不超过0.006重量%的C,不大于0.5重量%的Si,不大于2.0重量% Mn,不小于0.01重量%,但不超过0.10重量%,Ti,C和N含量被确定为满足Ti>(48/12)C wt%+(48/14)的条件 )N重量%时,钢还基本上由不少于0.0010重量%但不大于0.0100重量%的Nb组成,不小于0.0002重量%但不大于0.0020重量%的B,不小于0.03重量%,但是 不超过0.20重量%的P,不大于0.03重量%的S,不小于Al的0.010重量%但不大于0.100重量%,不大于0.008重量%的N,不大于0.0045重量%的 O,余量基本上是Fe和附带的夹杂物。 将钢材进行铸造和热轧,然后在不高于300℃的板材温度下进行冷轧,条件是在所述板温度之间满足以下条件的轧制轧制量的总和 (T°C),应变速率(ε)(S-1)为50%以上:T *(ε)> = 50,000℃S-1然后对钢板进行连续退火或合金化热浸镀锌。