| 摘要 |
PURPOSE:To manufacture a carburized steel with high surface hardness by preparing a steel contg. specified percentages of C, Mn, Cr, Si and Al and by carburizing it to form a carburized surface layer contg. precipitated fine spheroidal carbides. CONSTITUTION:A steel consisting of, by weight, 0.1-0.3% C, 0.2-1.5% Mn, 1- 3% Cr (Mn+Cr<=3%), 0.5-1.5% Si and/or 0.2-1.5% Al and the blance Fe with impurities or further contg.one or more among 0.1-0.5% each of Mo, V, Ti, Zr and Nb+Ta is prepd. The steel is worked and carburized in an atmosphere having about 1.0-2.5% carbon potential to obtain structural parts having superior pitting resistance, fatigue strength and high dimensional accuracy.
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