Manufacturing Gb 4cr5mosiv1 Material High Hardness Properties - China

GB 4Cr5MoSiV1 material is a Chinese national standard grade, corresponding to the internationally used H13 hot work die steel (American AISI H13 / European 1.2344 / Japanese SKD61).

It belongs to the Cr-Mo-V series of air-hardening hot work die steels and is one of the most widely used hot work die steels.

Core Mechanisms of High Hardness Performance 1 - Chemical Composition Support The alloy design of GB 4Cr5MoSiV1 material is the foundation of its high hardness: | Element | Content | Effect on Hardness | | C | 0.32~0.45% | Determines the hardness of the quenched martensitic matrix | | Cr | 4.75~5.50% | Improves hardenability, forms carbides | | Mo | 1.10~1.75% | Core element for secondary hardening, resists tempering softening | | V | 0.80~1.20% | Forms VC carbides, refines grains, improves wear resistance | 2 - Secondary Hardening Effect (Key) The high hardness of GB 4Cr5MoSiV1 material comes not only from quenched martensite but also relies on tempering secondary hardening: - After quenching, martensite + residual alloy carbides are formed.

- During tempering (530~600°C), Mo and V.

The dispersed precipitation of carbides generates a secondary hardening peak, enabling the material to maintain high hardness at high temperatures.

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