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    • 73. 发明授权
    • Method of manufacturing cold rolled steel sheet excellent in resistance of natural aging and panel properties
    • 生产耐老化性和面板性能优异的冷轧钢板的方法
    • US06273971B1
    • 2001-08-14
    • US09446702
    • 2000-04-10
    • Fusato KitanoTakeshi FujitaTadashi InoueMichihiro HiasaTakeo Ishii
    • Fusato KitanoTakeshi FujitaTadashi InoueMichihiro HiasaTakeo Ishii
    • C21D800
    • C22C38/04C21D8/0226C21D8/0436C21D8/0473C21D8/0478C22C38/004C22C38/12C22C38/14
    • The present invention provides a method of manufacturing a cold rolled steel sheet and a hot-dip zinc-coated steel sheet having excellent surface properties, an excellent resistance to natural aging and an excellent dent resistance of panel and, thus, adapted to the manufacture of steel sheet for outer panels of vehicles. The method comprises the steps of preparing steel consisting of 0.005 to 0.012% by weight of C, 0.01 to 0.4% by weight of Si, 0.15 to 1.0% by weight of Mn, 0.01 to 0.08% by weight of P, at most 0.02% by weight of S, 0.01 to 0.1% by weight of sol. Al, at most 0.004% by weight of N, and at least one element selected from the group consisting of 0.01 to 0.2% by weight of Nb and 0.04 to 0.1% by weight of Ti, and satisfying the condition 1.2≦(12/93) (Nb%/C%)+(12/48) (Ti*%/C%)≦2.5, applying a hot rolling and a cold rolling to the steel, soaking the cold rolled steel sheet at T(° C.) meeting a formula Ac3≧T(° C.)≧157log(X)+737, and cooling the steel sheet after the soaking step at a cooling rate meeting a formula R(° C./sec)≦−35+162/X. Ti*% (noted above)=Ti%−(48/14)N%−(48/32)S%. When Ti* in the above equation is not larger than 0, Ti* is regarded as 0.
    • 本发明提供一种制造冷轧钢板和热浸镀锌钢板的方法,所述冷轧钢板和热浸镀锌钢板具有优异的表面性能,优异的耐老化性和优异的耐面板耐凹陷性,因此适用于制造 车辆外板用钢板。 该方法包括以下步骤:制备由0.005至0.012重量%的C,0.01至0.4重量%的Si,0.15至1.0重量%的Mn,0.01至0.08重量%的P,至多0.02重量% 的S,0.01〜0.1重量%的溶胶。 Al,0.004重量%以下的N,和选自0.01〜0.2重量%的Nb和0.04〜0.1重量%的Ti中的至少一种元素,满足条件1.2 <=(12 / 93)(Nb%/ C%)+(12/48)(Ti *%/ C%)<= 2.5,对钢进行热轧和冷轧,将冷轧钢板在T 。)满足公式Ac3> = T(°C。)> = 157log(X)+737,并且在均热步骤后以符合公式R(℃/ sec) 35 + 162 / X。 Ti *%(上述)= Ti% - (48/14)N% - (48/32)S%。 当上述等式中的Ti *不大于0时,Ti *被认为是0。