Copper alloy die-casting die steel and manufacturing method thereof

Abstract

The invention relates to copper alloy die-casting die steel and a manufacturing method of the copper alloy die-casting die steel, and belongs to the technical field of steel and iron materials. The steel is hot work die steel with high-hardness high-heat-stability hard boride strengthening phases distributed on a single Austenite base body, the steel does not contain W, Mo, V, Co and other metal. Chemical compositions of the steel comprise, by weight, 0.3 percent to 0.6 percent of C, 0.1 percent to 1.2 percent of Si, 6.0 percent to 14.0 percent of Mn, 8.0 percent to 16.0 percent of Cr, 3.0 percent to 8.0 percent of Ni, 0.5 percent to 1.0 percent of Cu, 0.1 percent to 0.8 percent of B, P smaller than 0.015 percent, S smaller than 0.015 percent and the balance Fe. According to the method, raw materials are smelted, casting and ingoting are carried out under the argon atmosphere protection, and the copper alloy die-casting die steel is obtained after heat treatment and forging treatment. According to the high-temperature mechanical property of the copper alloy die-casting die steel, the 850 DEG C high-temperature tensile strength is 200 MPa to 310 MPa, the yield strength is 160 MPa to 200 MPa, the 850 DEG C high-temperature compressive strength is 270 MPa to 310 MPa, and the yield strength is 170 MPa to 210 MPa. Under the same test condition, the high-temperature tensile strength and the high-temperature compressive strength of the copper alloy die-casting die steel are obviously higher than those of H13 steel

Description

technical field [0001] The invention belongs to the technical field of steel preparation, and in particular relates to a copper alloy die-casting die steel and a preparation method thereof. Background technique [0002] Hot work die steel is a metal material for hot work dies such as hot forging dies, hot upset forging dies, hot extrusion dies and die-casting dies. Due to the very harsh service conditions of the hot work mold, such as bearing various stresses, bearing the corrosion of the working surface of the mold by the molten metal, and being repeatedly heated and cooled by high-temperature metals during work, the resulting compressive strain and tensile strain on the surface, It is easy to produce thermal fatigue and so on. Therefore, hot work die materials should have high thermal strength, high temperature hardness, impact toughness, hardenability, good thermal stability and thermal fatigue resistance, etc. In short, hot work die steel should have excellent comprehe...

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Problems solved by technology

In order to improve the service performance of copper alloy die-casting die steel, a new type of hot work die steel Y4 has also been developed in China. However, this type of steel still has the disadvantages of little improvement in service life and high cost during use.

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