Alloy material for hot stamping die and preparation method thereof

Abstract

The invention discloses an alloy material for a hot stamping die and a preparation method thereof. Chemical components of the die material comprise, by weight, 0.40-0.50% of C, 0.25-0.35% of Si, 0.80-1.2% of Mn, 1.5-2.0% of Mo, 0.8-1.5% of V, 0.05-0.15% of W, 0.15-0.25% of Er, 0.05-0.15% of Y, and the balance Fe. The elements such as W, Er and Y are added to the alloy material of the die. By adjusting the ratio of the chemical materials, the prepared die has the properties such as high strength, high heat conductivity, impact resistance, good thermal stability, good wear resistance and cold and hot fatigue resistance. According to the preparation method of the alloy material for the hot stamping die, a compact aluminum oxide thin film layer can be formed on the surface of the die through micro-arc oxidation treatment. Accordingly, the prepared alloy material has remarkable cold and hot fatigue resistance, wear resistance and stability of the die and has the wide market application prospects.

Description

technical field [0001] The invention relates to the technical field of die materials, in particular to an alloy material for a hot stamping die and a preparation method thereof. Background technique [0002] Molds are the basic technological equipment for mass production of industrial products. 70% of rough machining and 5% of finishing machining of industrial parts in machinery manufacturing need molds to complete. Plastic mold steel is an important mold material, which is widely used in various industries such as household appliances, electronics and communication equipment, plastic products, automobiles and motorcycles. Die steel can usually be divided into three categories: hot work die steel, cold work die steel and plastic die steel. Hot stamping die steel belongs to hot work die steel, mainly used to obtain ultra-high-strength stamping parts. It is one of the die steels with a sharp increase in usage and the largest consumption in the past 30 years, and its working c...

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Problems solved by technology

[0003] At present, the commonly used hot stamping die materials in China are mainly divided into the following categories: (1) General hot work die steel represented by H13 and DIEVAR, this type of hot work die steel has excellent strength-toughness ratio and thermal fatigue resistance However, its high temperature stability is poor, the high temperature friction and wear performance is not good, and the surface of the die is easy to rough during use, so it cannot meet the performance requirements required for variable strength hot stamping die steel

(2) Hot stamping die steel represented by HOTVAR and CR7V, this type of hot stamping die steel has excellent thermal stability, high temperature friction and wear performance, but its toughness is poor, and the ability to resist crack growth is not good. The die is prone to cracking and failure, so it cannot meet the performance requirements required by variable strength hot stamping die steel

(3) High thermal conductivity hot stamping die steel represented by HTCS-130. This type of hot stamping die steel has extremely high thermal conductivity and good toughness, but its high temperature friction and wear performance is insufficient. Highly prone to picking and thus does not meet the performance requirements required for variable strength hot stamping die steels

[0004] At present, the hot stamping die steel commonly used in the market is difficult to meet the stringent requirements of hot stamping technology. Therefore, the ideal hot stamping die material should have high thermal conductivity, thermal strength, wear resistance, impact toughness, hardenability and Thermal stability and thermal fatigue resistance, etc.

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