Special hot-stamping die steel HS7 and preparation method thereof

Abstract

The invention discloses novel special hot-stamping die steel HS7 and relates to the technical field of die steel component formulas and manufacturing. The chemical components of the special hot-stamping die steel include, by weight, 0.41-0.45% of C, 0.45-0.55% of Si, 0.35-0.45% of Mn, 6.4-6.80% of Cr, 1.20-1.40% of Mo, 0.75-0.85% of V, 015% or below of P, 0.003% or below of S and the balance Fe and inevitable impurities and residual trace elements. The die steel adopts unique optimized alloy element proportion, the organization level of and purity degree of materials are greatly improved through refined smelting and multidirectional forging and combination with high temperature homogenizing, ultrafine processing and other processes, the key indicators of the hot-stamping die steel are obviously improved, including abrasion resistance, high temperature abrasion resistance, thermal fatigue cracking resistance, resistance to plastic deformation and the like. Therefore, improve the qualityof hot stamping dies can be obviously improved, the service life of the dies can be prolonged, and better economic benefits can be obtained.

Description

technical field [0001] The invention relates to a mold material, specifically a special-purpose hot stamping die steel, which is mainly used for medium and high-grade hot stamping dies in the fields of automobiles, tools, etc., and relates to the technical field of die steel manufacturing. Background technique [0002] The mold industry is the mother of products and the most important basic equipment industry in product manufacturing. The main types include plastic molds, stamping molds, casting molds, forging molds, extrusion molds, glass molds, wire drawing molds, rubber molds, etc. Among them, stamping molds It can be divided into cold stamping die and hot stamping die. The mold material is the base material of the mold body, which is the basic key factor to ensure the performance and quality of the mold. According to the purpose and conditions of use, the mold steel can be divided into plastic mold steel, hot work mold steel, cold work mold steel and high-speed steel, et...

AI Technical Summary

Problems solved by technology

However, due to factors such as insufficient optimization of the alloy composition ratio, imprecise smelting, low purity, and no microstructure treatment, the performance of the material in terms of hardness and wear resistance, high temperature strength, toughness, and thermal fatigue resistance There are obvious deficiencies in all of them, which lead to the overall poor performance of hot stamping dies in terms of high temperature wear resistance, thermal crack performance, plastic deformation resistance, and overall cracking resistance. Requirements for hot stamping dies with large product batches, complex shapes, and high surface quality requirements

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