Hot working die steel and preparation method thereof

Abstract

The invention belongs to the technical field of hot working die steel and particularly provides a hot working die steel and a preparation method thereof. The hot working die steel comprises the components in percentage by weight: 0.30-0.60% of C, 2.7-3.5% of Cr, 2.0-2.5% of Mo, 0.20-0.80% of Si, 0.50-1.0% of Mn, 0.60-1.2% of V, 0.60-1.5% of Ni, 0.05-0.15% of Nb, 0.002-0.006% of B, less than or equal to 0.030% of S, less than or equal to 0.030% of P and the balance of Fe. The preparation method comprises: EAF primary smelting, LF refining, VD degassing, electroslag remelting, forging and heat treatment process route. The hot working die steel has reasonable steel alloy element proportioning, high thermal fatigue resistance, thermal shock cracking resistance, high heat stability and favourable combination property and greatly improves the service life of a hot working die. The steel of the invention can be used for manufacturing extrusion dies, forging dies and the like with long service life.

Description

technical field [0001] The invention belongs to the technical field of hot work die steel, and in particular provides a hot work die steel and a preparation method thereof. Background technique [0002] The hot work die steel material for near-net forming is one of the foundations and core technologies for realizing the modernization of the manufacturing industry, and its development level is the main indicator to measure the level of a country's manufacturing industry. Hot work die steel generally operates under quite complex working conditions, and the performance requirements for die steel materials are also quite strict. The currently widely used hot work die steel is H13. It has both strength and toughness, good thermal fatigue resistance and thermal stability, but when the service temperature exceeds 600 ° C, H13 steel loses its original excellent performance due to insufficient heat resistance, while 3Cr2W8V steel with high heat resistance due to Its thermal fatigue...

AI Technical Summary

Problems solved by technology

It has both strength and toughness, good thermal fatigue resistance and thermal stability, but when the service temperature exceeds 600 ° C, H13 steel loses its original excellent performance due to insufficient heat resistance, while 3Cr2W8V steel with high heat resistance due to Its thermal fatigue resistance is poor, and the mold often fails early due to cracks, which seriously limits its service life

[0003] In view of the above reasons, many scientific researchers at home and abroad are committed to the research of new high-performance hot work die steel. Although many new steel types have been developed, and there are some steel types with excellent performance, most of them are aimed at certain On the one hand, the problem is born, so its application field is limited

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