Fine-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 toughness, and fine-grained. Smelting ... -slag (ESRmake the production of die steel are in high purity and good performance.Anneal860-890 Hardness≤229HBWTemperature for Quenching1000-1030,oil ...