A high-toughness hot work die steel for hot forging dies and its preparation method

By adjusting the chemical composition and process flow, and controlling inclusions and carbides, the purity and toughness of hot forging die materials have been improved, solving the problem of performance instability of existing hot forging dies under high temperature and high pressure conditions, and achieving the performance requirements of high-end equipment manufacturing.

CN122128606APending Publication Date: 2026-06-02JIANGSU HONGSHENG DIE STEEL MATERIAL TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
JIANGSU HONGSHENG DIE STEEL MATERIAL TECH CO LTD
Filing Date
2026-04-17
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing hot forging die materials have unstable performance under high temperature, high pressure, and severe thermal cycling conditions, resulting in problems such as poor microstructure uniformity, carbide segregation, and unstable surface quality. This leads to large fluctuations in die life and makes it difficult to meet the needs of high-end equipment manufacturing.

Method used

By adjusting the chemical composition and employing special smelting, forging, and heat treatment processes, including electric furnace smelting, ladle refining, vacuum refining, die casting of electrode billets, electroslag remelting, forging, and solution treatment plus spheroidizing, inclusions and carbides are controlled, thereby improving the purity and toughness of the material.

Benefits of technology

It significantly improves the mold's resistance to cracking and corner collapse, extends the mold's service life, reduces the unit cost, and meets the requirements of large, precision, and long-life industrial molds.

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Abstract

This invention relates to a method for preparing a high-toughness hot work die steel for hot forging dies, comprising the following steps: S1, electric furnace smelting; S2, ladle refining; S3, vacuum refining; S4, die casting electrode billet; S5, electrode billet annealing; S6, electroslag remelting; S7, forging; S8, post-forging pretreatment; S9, solution treatment + spheroidizing final treatment. Based on the H13 composition, this invention, through adjustment of chemical composition and the use of special smelting, forging, and heat treatment processes, results in a product with excellent high purity, high hardness, and high toughness. Dies made from this material exhibit significantly improved resistance to cracking and corner collapse, extending die life while substantially reducing unit operating costs. This invention also relates to a high-toughness hot work die steel for hot forging dies, suitable for manufacturing large, precision, complex, and long-life critical industrial dies, capable of meeting the stringent performance requirements of die materials in the high-end equipment manufacturing field.
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