Invention Grant
US08834651B2 Method of production and production facility of high strength cold rolled steel sheet excellent in chemical convertibility 有权
化学可转换性优良的高强度冷轧钢板的生产和生产设备方法

Method of production and production facility of high strength cold rolled steel sheet excellent in chemical convertibility
Abstract:
A method using a continuous annealing furnace where a cooling method of a cooling zone including part or all of the temperature range of the steel sheet of 600 to 250° C. following the heating for recrystallization is one or more of gas cooling, effusion cooling, and cooling pipe cooling, or a joint cold rolled steel sheet/hot dip galvanized steel sheet facility having such a continuous annealing furnace, to continuously anneal cold rolled steel sheet to produce high strength cold rolled steel sheet, characterized by exposing the steel sheet surface to an iron-oxidizing atmosphere in the steel sheet temperature range to make the surface oxidize, pickling the sheet at the outlet side of the annealing furnace, then iron- or Ni-plating the sheet to 1 to 50 mg/m2.
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