| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing steel having excellent uniform elongation properties and fatigue crack propagation properties. SOLUTION: Steel having a composition containing, by mass, 0.10 to 0.16% C, 0.10 to 0.50% Si, 0.8 to 1.2% Mn,≤0.05% P and≤0.02% S, and, if required, one or more kinds of metals selected from≤0.4% Cu,≤0.8% Ni,≤0.4% Cr,≤0.4% Mo,≤0.05% Nb,≤0.05% V,≤0.03% Ti and≤0.003% B, and the balance substantially Fe, and satisfying Ceq=0.40 is heated at 950 to 1,200°C and is thereafter rolled at≥Ar<SB>3</SB>at a cumulative draft of≥50%, and accelerated cooling is started from≤Ar<SB>3</SB>and also from the temperature range of Ar<SB>3</SB>-60°C and≥730°C at a cooling rate of 10°C/s to <30°C/s, and is subsequently stopped at 500 to 650°C. COPYRIGHT: (C)2006,JPO&NCIPI
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