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    • 20. 发明授权
    • Coated seizure-hardening type cold-rolled steel sheet having excellent aging resistance and method of production thereof
    • 耐老化性优异的涂布硬化型冷轧钢板及其制造方法
    • US06171412B2
    • 2001-01-09
    • US09194533
    • 1998-11-25
    • Saiji MatsuokaMasahiko MoritaOsamu FurukimiTakashi ObaraTetsuya KiyasuYoshio Yamazaki
    • Saiji MatsuokaMasahiko MoritaOsamu FurukimiTakashi ObaraTetsuya KiyasuYoshio Yamazaki
    • C21D800
    • C22C38/14C21D8/02C21D8/0426C21D8/0431C21D8/0436C21D8/0473C22C38/12
    • Disclosed are bake-hardenable sheet steel with good anti-aging property and a method for producing it. While controlling its C, P, S and N contents, the chemical composition of the sheet steel is defined to comprise not larger than 1.0% of Si, not larger than 3.0% of Mn, from 0.01 to 0.20% of Al and from 0.001 to 0.2% of Ti, in terms of % by weight. The value A (=(AIQUENCH−AI)/AIQUENCH) of the sheet steel is defined to be not smaller than 0.4 and the value AIQUENCH thereof to be not smaller than 30; or the ratio of the mean misorientation, M (degree), to the mean grain size, G (&mgr;m), M/G, of the sheet steel is defined to be not smaller than 0.8. The steel may additionally contain from 0.001 to 0.2% of Nb and/or from 0.0001 to 0.0080% of B. While controlling its Si, Mn, S, Al and N contents, the chemical composition of a steel slab is defined to comprise from 0.005 to 0.02% of C, not larger than 0.05% of P and from 0.025 to 0.19% of Nb, with satisfying the condition of 0.7×(C/12)≦Nb/93≦1.2×(C/12) (where C indicates the C content (wt. %), and Nb indicates the Nb content (wt. %)). To produce bake-hardenable sheet steel from it, the slab is heated, hot-rolled at a finishing delivery temperature of from 960 to 650° C., coiled at a temperature of from 750 to 400° C., then cold-rolled to a reduction of from 50 to 95%, and thereafter annealed for recrystallization at a temperature of from 750 to 920° C. The slab may additionally contain B and/or Ti. The invention stably produces bake-hardenable sheet steel on an industrial scale.
    • 公开了具有良好抗老化性能的可烘烤硬化性钢板及其制造方法。 在控制其C,P,S和N含量的同时,将钢板的化学成分定义为不大于1.0%的Si,不大于Mn的3.0%,Al的0.01至0.20%和0.001至 0.2%Ti,以重量%计。 将钢板的值A(=(AIQUENCH-AI)/ AIQUENCH)定义为不小于0.4且其AIQUENCH值不小于30; 或平均取向度M(度)与平均晶粒尺寸G(mum),M / G的比值定义为不小于0.8。 钢可以另外含有0.001-0.2%的Nb和/或0.0001-0.0080%的B。在控制其Si,Mn,S,Al和N含量的同时,钢坯的化学组成定义为包含0.005 至0.02%的C,不大于0.05的P和0.025至0.19%的Nb,满足0.7x(C / 12)<= Nb / 93 <= 1.2×(C / 12)的条件(其中 C表示C含量(重量%),Nb表示Nb含量(重量%))。 为了从其制造可烘烤硬化的钢板,在960〜650℃的最终输送温度下对板坯进行加热,热轧,在750〜400℃的温度下卷取,然后冷轧至 减少50至95%,然后在750至920℃的温度下退火再结晶。板可以另外含有B和/或Ti。 本发明在工业规模上稳定地生产可烘烤硬化钢板。