Corrosion-resistant plastic mold steel and preparation method thereof

Abstract

The invention relates to novel corrosion-resistant mold steel which comprises the following chemical components in percentage by weight: 0.16-0.24% of C, less than or equal to 0.15% of Si, less than or equal to 0.15% of Mn, less than 0.015% of P, less than 0.005% of S, 12.00-12.60% of Cr, 0.13-0.20% of N, 0.03-0.08% of Ta, 0.30-0.37% of C and N, and the balance being Fe and unavoidable impurities. The invention also relates to a preparation method of the novel corrosion-resistant mold steel. The preparation method comprises the following steps of: smelting and pouring to form an electrode bar in a vacuum induction furnace; carrying out electroslag remelting so as to form electroslag ingots; heating and forging steel ingots into forging stocks; and carrying out annealing treatment on the forging stocks, wherein the ingots are heated to the temperature of 1100-1200 DEG C and kept for 1-2 hours before forging, and in the annealing treatment of the forging stocks, the annealing temperature is 830-860 DEG C, and the temperature is kept for 3-4 hours. The mold steel provided by the invention has high-corrosion-resistant performance, high polishing performance, and low linear expansion coefficient, and is suitable for the preparation of a corrosion-resistant fine plastic mold.

Description

technical field [0001] The invention relates to a plastic mold steel, in particular to a plastic mold steel with good corrosion resistance, good polishing performance and low alloy cost, which is used for the manufacture of corrosion-resistant precision plastic molds. Background technique [0002] There are many kinds of plastic products, including auto parts such as: lampshades, instrument panels, optical instrument parts such as lenses, housings of household appliances, PVC daily-use plastic products, etc. Among them, the plastic used in the housing of home appliances is ABS+flame retardant. Some plastics, such as polyvinyl chloride, fluoroplastics, flame-retardant ABS, etc., will decompose corrosive gases such as hydrogen chloride, hydrogen fluoride, and sulfur dioxide, which will have a certain corrosive effect on the mold. Therefore, molds for such plastic products should be corrosion-resistant. performance. The steel grade that can meet the requirements of corrosion ...

AI Technical Summary

Problems solved by technology

[0008] In order to overcome the disadvantages of carbide segregation, difficult structure control and high alloy cost of the existing corrosion-resistant mold steel, the present invention adopts the idea of ​​micro-alloying to design a corrosion-resistant plastic mold steel with low content of alloy elements. Composition design ideas, and control the total amount of C+N in a reasonab

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