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Production manner null of the continual annealing cold rolling steel sheet which possesses the complete non-ageing properties where balance of deep drawing Characteristic and resistance deep drawing brittleness
Production manner null of the continual annealing cold rolling steel sheet which possesses the complete non-ageing properties where balance of deep drawing Characteristic and resistance deep drawing brittleness
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机译：具有完全的不时效性能，在深冲特性和抗深冲脆性之间达到平衡的连续退火冷轧钢板的生产方式无效
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摘要
PURPOSE: To provide a continuously annealed cold rolled steel sheet in which deep drawability and deep drawing brittleness resistance, which are the antinomy in an IF steel, are combined with each other and well balanced with each other. ;CONSTITUTION: A molten steel, which has a composition consisting of, by weight, ≤0.0030% C, 0.05-0.20% Mn, ≤0.05% Si, ≤0.02% P, ≤0.020% S, 0.025-0.06% sol.Al, ≤0.0030% N, 0.02-0.10% Ti, 0.0003-0.0010% B, and the balance Fe, is prepared and cast. Hot rolling is finished at 880-920°C so that 0.015X+0.09≤Y≤0.01X+0.21 Y=[ΣIn(ti-1/ti)/In(to/tn), i=n-2 to n-1, X=-In[(C/Ti*)B], and Ti*=Ti-(48/14)N-(48/32)S≥0 [where ti represents the thickness of a steel strip on the outlet side of the i-th stand of a continuous hot finisher) are satisfied. After cold rolling at ≥70% draft, continuous annealing is done at a temp. between 750°C and the Ac3 transformation point.;COPYRIGHT: (C)1995,JPO
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