WEAR-RESISTANT LOW-ALLOY CAST STEEL

摘要

PROBLEM TO BE SOLVED: To provide a wear-resistant low-alloy cast steel that secures high toughness, achieves a hardness of HRC 45-53, and improves the wear-resistance, by optimizing the alloy composition capable of reducing occurrence of a quenching crack even if water quenching is performed to secure high hardness in a cast steel product with a thickness of one inch or greater.;SOLUTION: The wear-resistant low-alloy cast steel includes 0.30-0.35 mass% C, 0.30-0.60 mass% Si, 0.90-1.50 mass% Mn, 0.91-1.50 mass% Cr, 1.60-1.90 mass% Ni, 0.20-0.30 mass% Mo, 0.05 or less mass% P, 0.05 or less mass% S, and the rest being Fe and unavoidable impurities, and its product has a thickness of one inch or greater. The cast steel undergoes heat treatment including a homogenization process of heating and maintaining it at 1,000-1,100°C and then furnace-cooling it, a quenching process of heating and maintaining it at 850-950°C and then water-quenching it, and a tempering process of heating and maintaining it at 150-280°C and then furnace-cooling it to room temperature.;COPYRIGHT: (C)2013,JPO&INPIT