ELECTRIC FURNACE STEEL FOR CARBURIZING WITHOUT MO ADDITION AND MANUFACTURING METHOD THEREFOR

摘要

An electric furnace steel contains, by mass %, C: 0.12 to 0.28%, Si: equal to or less than 0.15%, Mn: 0.65 to 0.95%, P: equal to or less than 0.035%, S: equal to or less than 0.035%, Cr: 1.35 to 1.90%, Al: 0.020 to 0.050%, and N: 0.0080 to 0.0230%. A scrap material is selected such that Cu, Ni, and Mo that derive from the scrap material and are thus contained as impurities in the electric furnace steel satisfy Expression 1. The electric furnace steel further contains Fe and unavoidable impurities as a remainder thereof. Accordingly, the electric furnace steel can secure carburizing quality equivalent to or higher than that of Cr—Mo steel, and can have properties equivalent to or higher than that of Cr—Mo steel, without adding Mo.;([Cu]+2×[Ni])0.76×[Mo]≧0.0040  Expression 1:

主权项

1. An electric furnace steel for carburizing without Mo addition that is manufactured by an electric furnace using a scrap material as a main raw material thereof,
the electric furnace steel comprising, by mass %, C: 0.12 to 0.28%, Si: equal to or less than 0.15%, Mn: 0.65 to 0.95%, P: equal to or less than 0.035%, S: equal to or less than 0.035%, Cr: 1.35 to 1.90%, Al: 0.020 to 0.050%, and N: 0.0080 to 0.0230%, the scrap material being selected such that Cu, Ni, and Mo that are derived from the scrap material and are contained as impurities in the electric furnace steel satisfy Expression 1,
([Cu]+2×[Ni])0.76×[Mo]≧0.0040  Expression 1: (where [Cu], [Ni], and [Mo] respectively mean contents (mass %) of Cu, Ni, and Mo in the steel), the electric furnace steel further comprising Fe and unavoidable impurities as a remainder thereof.