... grained high-quality hot alloy steel,4Cr5MoSiV,high hardenability, high toughness, and fine-grained. Fine-grained high-quality hot alloy steel,4Cr5MoSiV,high hardenability, high ... Hardness≤229HBWTemperature for Quenching1000-1030,oil or air cooling.Temperature for Tempering530-580,using double ... austenitized temperature, small heat deformation, and in air-quenching , the tendency of the appearing ...