Light highly-thermal-fatigue-resistant pre-hardened plastic die steel and preparation method thereof

Abstract

The invention discloses light highly-thermal-fatigue-resistant pre-hardened plastic die steel. According to the die steel, the ratio of elements such as Ni, Mn, Ti and V is properly increased on the basis of the element ratio of the conventional pre-hardened plastic die steel, and meanwhile, the dosage of the other alloy elements is controlled, so that the mechanical properties and processability of an alloy material are improved further on the basis of guaranteeing the mechanical properties of the conventional plastic die steel, and the pre-hardened plastic die steel is light, high in strength, good in abrasion resistance and corrosion resistance, good in thermal fatigue resistance, and low in possibility of generating surface defects, and can be used for pouring of various types of plastic parts; the structure of the die steel is refined through an added rare earth oxide-graphene oxide cladded nano tungsten carbide composite modifier, the interface compatibility among crystals is improved and reinforcing and toughening effects are remarkable; the die steel is simple and efficient in preparation method, short in manufacturing period, and durable, can effectively improve the surface quality of plastic parts and has extremely high production application value.

Description

technical field [0001] The invention relates to the technical field of plastic mold steel products, in particular to a pre-hardened plastic mold steel with light weight and high thermal fatigue resistance and a preparation method thereof. Background technique [0002] With the rapid development of automobiles, tractors, motors, radios, household appliances and national defense industries, non-cutting processes such as cold stamping, extrusion, die forging and die-casting are widely used, and the demand for molds is increasing. There are also higher and higher requirements for the steel types of the mold, the metallurgical production of the steel and the heat treatment quality of the steel. [0003] At present, the types of die steel mainly include cold work die steel, hot work die steel, plastic die steel, etc., among which plastic die steel accounts for the largest proportion, and the performance of die steel is directly related to the quality of processed plastic products....

AI Technical Summary

Problems solved by technology

[0003] At present, the types of die steel mainly include cold work die steel, hot work die steel, plastic die steel, etc., among which plastic die steel accounts for the largest proportion, and the performance of die steel is directly related to the quality of processed plastic products. The characteristics of plastic products have high requirements for plastic mold steel in terms of corrosion resistance, dimensional stability, surface wear resistance, and polishing. The existing plastic mold steel mainly has low hardness, poor wear resistance, and the use of Problems to be solved such as low service life and many surface defects