Plastic mold steel and preparation method thereof

Abstract

The invention provides a plastic mold steel and a preparation method thereof. The mold steel is prepared from, by weight, 0.35%-0.45% of C; 0.75%-1.05% of Si; 1.00%-1.50% of Mn; 1.50%-2.00% of Cr; 0.003%-0.004% of Mg; less than or equal to 0.015% of P; less than or equal to 0.025% of S; and the balance Fe and unavoidable impurities, specifically, the sum of the Si, the Mn, and the Cr is equal to 3.65%-4.25%, and the ratio of the Cr to the Mn is equal to 1.3-1.6. The mold steel homogeneity is within 2 HRC, and the transverse and longitudinal impact ratio is 0.87-0.90. The preparation method comprises the steps of smelting, casting, heating, rolling and heat treatment. The plastic mold steel has simple production process, short cycle and high hardness and toughness, and reaches the level ofhigh-end plastic mold steel.

Description

technical field [0001] The invention belongs to the technical field of metal material production, and in particular relates to a plastic mold steel and a preparation method thereof. Background technique [0002] In recent years, the plastic products industry has developed very rapidly, and its output and consumption have increased relatively steadily. At the same time, it has also brought about the rapid development of plastic mold steel. Compared with industrially developed countries, my country's plastic mold steel is in the early stage of development , lack of special steel grades for plastic molds, P20, 718 pre-hardened plastic mold steel modules and high-precision flat steel, there are still problems such as long delivery time, poor quality and incomplete varieties and specifications in China, so the domestic plastic mold steel industry uses more steel Alternative steel grades from import or domestic production. At the same time, the traditional plastic mold steel has th...

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