| 摘要 |
PROBLEM TO BE SOLVED: To provide non-heat-treated steel which, even when the heating temperature in hot rolling fluctuates, can prevent the dispersion of hardness, thus securing stable mechanical properties. SOLUTION: This non-heat-treated steel comprises 0.35-0.55% C, 0.10-2.0% Si, 0.5-1.6% Mn, 0.10-0.25% S, 0.001-0.05% Al, 0.05-0.30% Ti, 0.0080% or lower N, and the balance being Fe and impurities, has a value of Ti (%)-3×S (%) lower than -0.1, and, if necessary, may further contain at least one of Ca, Mg, and Te and/or at least one of V, Cr, and Ni. COPYRIGHT: (C)2003,JPO
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