| 摘要 |
PURPOSE:To obtain a heat resistant steel having superior strength and toughness by hot forging a steel contg. regulated amounts of C, Si, Mn, Cr, S, P and O in the austenite temp. range and by rapidly cooling it from the austenite- ferrite two-phase range to form a structure contg. 30-70% by area of ferrite. CONSTITUTION:A steel contg., by weight, 0.05-0.30% C, 1.0-3.0% Si, 0.8-2.5% Mn, 0.4-1.5% Cr, <=0.020% S, <=0.02% P and <=0.0015% O is hot forged in the austenite temp. range and rapidly cooled from the austenite-ferrite two-phase range. The steel may be rapidly cooled after forging in the two-phase range. Thus, the desired heat resistant steel having a structure consisting of 30-70% by area of ferrite and the balance martensite or martensite and bainite is obtd.
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