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The machine structural steel null which is superior in machinability, resistance grain conversion property and the resistance for case
The machine structural steel null which is superior in machinability, resistance grain conversion property and the resistance for case
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机译:机加工性,电阻晶粒转化性和壳体电阻优异的机械结构用钢
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摘要
PROBLEM TO BE SOLVED: To provide a steel for machine structural use, excellent in machinability, capable of inhibiting the coarsening of austenite grains even if high-temp., short-time treatment is performed at the time of surface hardening treatment such as carburizing, and increased in resistance to case crush. ;SOLUTION: The steel has a composition consisting of, by weight, 0.3-0.5% C, 1.0% Si, ≤2.0% Mn, ≤0.03% P, 0.02-0.15% S, ≤2.0% Cr, ≤0.4% Ti, ≤0.4% Zr, ≤0.008% N, ≤3.5% Ni, ≤1.0% Mo, ≤1.0% W, ≤0.005% B, ≤0.1% Nb, ≤0.3% V, ≤0.3% Pb, ≤0.1% Ca, ≤0.1% Al, and the balance Fe with impurities and satisfying Ti(%)+Zr(%)=0.025 to 0.4%.;COPYRIGHT: (C)1999,JPO
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