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    • 72. 发明授权
    • High-strength cold-rolled steel sheet excelling in deep drawability and
method of producing the same
    • 高强度冷拉伸性能优良的低强度冷轧钢板及其制造方法
    • US5360493A
    • 1994-11-01
    • US72725
    • 1993-06-07
    • Saiji MatsuokaHidetaka KawabeEiko YasuharaKei SakataToshiyuki Kato
    • Saiji MatsuokaHidetaka KawabeEiko YasuharaKei SakataToshiyuki Kato
    • C21D8/04C22C38/12C22C38/06
    • C21D8/0426C22C38/12C21D8/0405C21D8/0436C21D8/0463C21D8/0473
    • In a method of producing a high-strength cold-rolled steel sheet excelling in deep drawability, a steel material is used which consists of: a basic composition including 0.01% or less of C, 0.1 to 2.0% of Si, 0.5 to 3.0% of Mn, 0.02 to 0.2% of P, 0.05% or less of S, 0.03 to 0.2% of Al, 0.01% or less of N, 0.001 to 0.2% of Nb, and 0.0001 to 0.008% of B in such a way that the respective contents of C, Nb, Al, N, Si, Mn and P satisfy the following formulae:5.ltoreq.Nb/C.ltoreq.30, 10.ltoreq.Al/N.ltoreq.80, and 16.ltoreq.(3.times.Si/28+200 .times.P/31)/(Mn/55).ltoreq.40; Fe remnant; and inevitable impurities, the method including the steps of:performing rolling on the steel material with a total reduction of 50% or more and 95% or less while effecting lubrication thereon in a temperature range of not higher than the Ar.sub.3 transformation temperature and not lower than 500.degree. C.;performing a hot-rolled sheet recrystallization treatment on the steel material by a coiling or annealing process;performing cold rolling on the steel material with a reduction of 50 to 95%; and theneffecting recrystallization annealing on the steel material in a temperature range of 700 .degree. to 950.degree. C.
    • 在制造深冲性优异的高强度冷轧钢板的方法中,使用由以下组成的钢材,所述钢材由以下组成:含有0.01%以下的C,0.1〜2.0%的Si,0.5〜3.0% 的Mn,0.02〜0.2%的P,0.05%以下的S,0.03〜0.2%的Al,0.01%以下的N,0.001〜0.2%的Nb和0.0001〜0.008%的B, C,Nb,Al,N,Si,Mn和P的各自的含量满足下式:5≤Nb/C≤30,10≤Al/N≤80, =(3×Si / 28 + 200×P / 31)/(Mn / 55)≤40; 铁残 和不可避免的杂质,所述方法包括以下步骤:在不高于Ar 3转变温度的温度范围内对钢材进行总压下率为50%以上且95%以下的润滑而不降低 500℃以上。 通过卷取或退火处理对钢材进行热轧板再结晶处理; 对钢材进行冷轧,减少50〜95%; 然后在700〜950℃的温度范围内对钢材进行再结晶退火。
    • 77. 发明授权
    • Method for producing hot-rolled dual-phase high-tensile steel sheets
    • 热轧双相高强度钢板的制造方法
    • US4421573A
    • 1983-12-20
    • US394999
    • 1982-06-09
    • Toshio IrieToshiyuki KatoIsao Takahashi
    • Toshio IrieToshiyuki KatoIsao Takahashi
    • B21B3/00C21D8/02C21D9/46C22C38/00C22C38/34
    • C21D9/46C21D8/0226C21D2211/005C21D2211/008
    • Dual-phase high-tensile steel sheets having a composite structure consisting of martensite and ferrite and a tensile strength of the order of 50-80 kg/mm.sup.2 in an as-hot-rolled state are produced by a method which comprises preparing as a starting material a slab comprising 0.03-0.15% C, 0.5-1.0% Mn, 0.8-2.0% Si, 0.6-2.0% Cr, 0.01-0.1% Al, the balance being essentially Fe and accompanying impurities, heating said slab at a temperature of 1,050.degree.-1,220.degree. C., hot rolling the heated slab, completing the hot rolling at a temperature of 800.degree.-900.degree. C., thereafter cooling the hot-rolled sheet to a temperature of 350.degree.-500.degree. C., and winding the sheet into a coil at the latter temperature. A proper combination of the above-mentioned steel composition, slab heating temperature prior to hot rolling, final hot rolling temperature and winding temperature allows hot-rolled dual-phase high-tensile steel sheets having improved formability and uniform mechanical properties to be produced at a low cost without adding expensive Mo.
    • PCT No.PCT / JP81 / 00281 Sec。 371日期1982年6月9日 102(e)日期1982年6月9日PCT提交1981年10月14日PCT公布。 出版物WO82 / 01379 日期:1982年4月29日。具有由马氏体和铁素体组成的复合结构的双相高强度钢板和在热轧状态下的拉伸强度为50-80kg / mm2的拉伸强度通过 方法,其包括制备包含0.03-0.15%C,0.5-1.0%Mn,0.8-2.0%Si,0.6-2.0%Cr,0.01-0.1%Al,余量基本上为Fe和伴随杂质的板坯, 在1050℃-120℃的温度下对所述板进行加热,对加热的板坯进行热轧,在800-900℃的温度下完成热轧,然后将该热轧板冷却至350℃ -500℃,并在后一温度下将片材卷绕成线圈。 上述钢组合物的合适组合,热轧前的板坯加热温度,最终的热轧温度和卷绕温度的适当组合,可以使得成型性和机械性能均匀的热轧双相高强度钢板在 低成本而不添加昂贵的Mo。