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LOW ALLOY STEEL SHEET EXCELLENT IN WORKABILITY, RAPID HEAT TREATMENT PROPERTY, AND FATIGUE CHARACTERISTIC AFTER RAPID HEAT TREATMENT
LOW ALLOY STEEL SHEET EXCELLENT IN WORKABILITY, RAPID HEAT TREATMENT PROPERTY, AND FATIGUE CHARACTERISTIC AFTER RAPID HEAT TREATMENT
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机译：低合金钢薄板具有出色的可加工性，快速的热处理性能以及快速热处理后的疲劳特性
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摘要
PROBLEM TO BE SOLVED: To provide a low alloy steel sheet excellent in bore expandability, workability for fine blanking and heat treatment property and used for various machine parts. ;SOLUTION: This low alloy steel sheet has a composition by weight of 0.15-0.50% C, ≤0.30% Si, 0.3-1.0% Mn, ≤0.03% P, ≤0.01% S, 0.01-0.15% Ti, 0.0005-0.0050% B, ≤0.01% N, 0.02-0.10% Al, and 0-0.5% Cr and in which P content and B content satisfy the relation of [%p]≤6×[%B]+0.005. The average grain size of carbides which are dispersedly precipitated in the steel is regulated to 0.4-1.0 μm and also their spheroidizing ratio is regulated preferably to ≥90%. Further, the surface roughness Ra of the steel sheet is ≤5 μm.;COPYRIGHT: (C)2000,JPO
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