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COLD ROLLED STEEL SHEET AND HOT ROLLED STEEL SHEET EXCELLENT IN BAKE HARDENABILITY AND RESISTANCE TO ORDINARY TEMPERATURE AGING AND METHOD FOR THEIR PRODUCTION
COLD ROLLED STEEL SHEET AND HOT ROLLED STEEL SHEET EXCELLENT IN BAKE HARDENABILITY AND RESISTANCE TO ORDINARY TEMPERATURE AGING AND METHOD FOR THEIR PRODUCTION
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机译:冷轧钢板和热轧钢板具有出色的烘烤硬化性和耐普通温度时效性及其生产方法
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摘要
To provide a steel sheet excellent in painting bake hardenability and anti-aging property at room temperature: containing, in mass, 0.0001 to 0.20% of C, 2.0% or less of Si, 3.0% or less of Mn, 0.15% or less of P, 0.015% or less of S, and, in addition, 0.20% or less of Al and 0.001 to 0.10% of N so as to satisfy the expression 0.52Al/N, 10 and, further, one or more of 2.5% or less of Cr, 1.0% or less of Mo and 0.1% or less of V so as to satisfy the expression (Cr + 3.5Mo + 39V) ‰¥ 0.1, with the balance consisting of Fe and unavoidable impurities; having the value of BH170, evaluated after applying a 2% tensile deformation and then a heat treatment at 170°C for 20 min., being 45 MPa or more, and any of the value of BH160, evaluated after applying a 2% tensile deformation and then a heat treatment at 160°C for 10 min., and the value of BH150, evaluated after applying a 2% tensile deformation and then a heat treatment at 150°C for 10 min., being 35 MPa or more; and having the yield point elongation at a tensile test after applying a heat treatment at 100°C for 1 h. being 0.6% or less.
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