Hot work die steel and preparation method thereof

Abstract

The invention discloses hot work die steel and a preparation method thereof. The hot work die steel is composed of the following constituent elements including, by weight, 0.396%-0.397% of carbon, 0.975%-1.03% of silicon, 0. 427%-0.514% of manganese, 1.55%-1.59% of molybdenum, 4.94%-5.10% of chromium, 0.984%-1.04% of vanadium, 0.044%-0.127% of titanium and the balance iron and inevitable impurities. According to the hot work die steel, the Ti element is added on the basis of H13 steel compositions; on one hand, the effects of controlling the grain size, preventing excessive growth of grains and increasing precipitation strengthening and fine grain strengthening are achieved, and the strength and hardness of the steel are improved; and on the other hand, the titanium reacts with the carbonto generate titanium carbide, the advantages of high hardness and good thermal stability are achieved, the effect of precipitation strengthening is achieved, and micro Ti alloying is formed. The roomtemperature Rockwell hardness, room temperature tensile strength, room temperature tensile section shrinkage, the high-temperature tensile section shrinkage rate and the high-temperature tensile strength of the hot work die steel are significantly improved, and the comprehensive mechanical properties are obviously enhanced.

Description

technical field [0001] The application relates to the technical field of new materials, in particular to a hot work die steel and a preparation method thereof. Background technique [0002] Hot working dies are tooling used to make heated metal or liquid metal into desired products, such as hot forging dies, hot heading dies, hot extrusion dies, die-casting dies and high-speed forming dies, etc. All kinds of hot working dies are Working at higher temperatures, especially in hot extrusion of steel and die casting of steel, the temperature of steel is in the range of 1200-1500 °C, so the most important performance requirement for hot work die steel is the heat resistance of steel Sex, followed by toughness and thermal fatigue resistance. The various mold steels used in hot work molds are collectively referred to as hot work mold steels. [0003] H13 steel is a commonly used steel for hot work die steel. It is mainly used in die casting dies, hot forging dies, and hot extrusi...

AI Technical Summary

Problems solved by technology

However, H13 steel has the following disadvantages: low heat treatment deformation rate, low section shrinkage rate, low tensile strength, and rapid decrease in hardness when the service temperature is higher than 540 °C

Therefore, the hot work mold prepared by using H13 steel will have plastic deformation, cracking, bluntness, washboard pattern and thermal wear during use.

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