High-toughness heat-resistant corrosion-resistant pre-hardened plastic die steel and preparation method thereof

Abstract

The invention discloses high-toughness heat-resistant corrosion-resistant pre-hardened plastic die steel. According to the die steel, the ratio of elements such as Mn, Si, Cr and Sr are 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 alloy are improved further on the basis of guaranteeing the mechanical properties and processability of the conventional plastic die steel, and the pre-hardened plastic die steel has good toughness and hardness, is small in internal stress, and low in possibility of abrasion and corrosion cracking and can be used for pouring of various types of plastic parts; an added rare earth oxide cladded nano tungsten carbide composite modifier has good wettability with alloy liquid, so that a modification effect is uniform and stable, the reinforcing and toughening effects are remarkable and the crystal phase of the alloy is compact and fine; the die steel is simple and efficient in preparation method and short in manufacturing period, 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 tough, heat-resistant and corrosion-resistant pre-hardened plastic mold steel 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. The ch...

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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