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首页> 外国专利> High tensile cold rolled steel sheet and high tensile not dip galvanized steel sheet having improved stretch flanging property and process for producing same

High tensile cold rolled steel sheet and high tensile not dip galvanized steel sheet having improved stretch flanging property and process for producing same

机译：具有改善的拉伸翻边性能的高强度冷轧钢板和高强度不浸镀锌钢板及其生产方法

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摘要

There is disclosed a high tensile cold rolled steel sheet improved in ductility, particularly stretch flanging property, containing 0.03% to 0.15% by weight of C, 0.05% or less by weight of Si, 0.5% to 1.2% by weight of Mn, 0.005% to 0.045% by weight of Nb, and 0.10% or less by weight of Al, the remainder being iron and unavoidable impurities, and the steel sheet having a uniform and fine recrystallized ferrite structure having a mean grain diameter of 20 µm or less and an area fraction of 95% or more, said high tensile cold rolled steel sheet can be obtained by preparing, as a material, steel containing 0.03% to 0.15% by weight of C, 0.05% or less by weight of Si, 0.5% to 1.2% by weight of Mn, 0.005% to 0.045% by weight of Nb, and 0.10% or less by weight of Al, the remainder being iron and unavoidable impurities, subjecting the material to hot rolling, effecting cold rolling at a reduction rate in thickness of more than 50%, and effecting annealing in which the material is heated at a heating rate of 5°C/sec or more and retained in a temperature range of 720 to 780°C for 20 to 60 seconds in a continuous annealing line, and then cooling the material.
机译：公开了一种在延展性，特别是拉伸翻边性能方面改善的高强度冷轧钢板，其包含0.03重量％至0.15重量％的C，0.05重量％以下的Si，0.5重量％至1.2重量％的Mn，0.005。 Nb为0.045重量％至0.045重量％，Al为0.10重量％以下，其余为铁和不可避免的杂质，并且钢板具有均匀且微细的再结晶铁素体组织，平均晶粒直径为20μm以下，并且通过将含有0.03〜0.15重量％的C，0.05重量％以下的Si，0.5重量％〜0.55％的C作为原料，可以得到上述高强度冷轧钢板，其面积率为95％以上。 Mn为1.2重量％，Nb为0.005％至0.045％，Al为0.10％以下，其余为铁和不可避免的杂质，使材料进行热轧，以降低轧制率进行冷轧。厚度大于50％，并进行退火，其中将材料加热至加热速度为5°C /秒或更高，并在连续退火线中在720至780°C的温度范围内保持20至60秒，然后冷却材料。

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