... alloy steel,4Cr5MoSiV,high hardenability, high toughness, and fine-grained. Fine-grained high-quality hot alloy steel,4Cr5MoSiV,high hardenability, high toughness, and ... grained. Smelting characteristics The features of composition designhigh hardenability, high toughness, and fine-grained.The use of Electric arc ... be in the range of 540-620 Fine-grained high-quality hot alloy steel parts,4Cr5MoSiV