... 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 characteristics The features of composition designhigh ... hardenability, high toughness, and fine-grained.The use of Electric arc furnace (EAF+ refiningLF ...