Plastic mold steel and method for manufacturing same

Abstract

The invention relates to a plastic die steel and a manufacture method thereof. The chemical components of the plastic die steel according to a weight percentage include 0.32 to 0.45 percent of C, 0.20 to 1.00 percent of Si, 0.20 to 1.00 percent of Mn, 12.60 to 18.0 percent of Cr, 0.6 to 2.3 percent of Cu, 0,34 to 1.00 percent of Ni with a Ni / Cu ratio larger than one third and less than or equal to one second, equal to or less than 0.035 percent of P, equal to or less than 0.030 percent of S, 0.90 to 0.97 percent of Mo and the rest are Fe and impurity elements. The manufacture method of the plastic die steel includes: heating to 1180 to 1200 DEG C and forging after heat preservation for 2 hours; besides, the starting forging temperature is 1050 to 1100 DEG C and the finishing forging temperature is 900 to 950 DEG C. As added with the chemical component Cu, the invention not only improves the anti-corrosion performance of a Cl-ion medium and simultaneously improves the cutting performance.

Description

technical field [0001] The invention relates to a plastic mold steel product in the metallurgical industry and a manufacturing method thereof, in particular to a plastic mold steel with good corrosion resistance and cutting performance. Background technique [0002] With the rapid development of industrial technology, precision stamping, pressure casting, cold extrusion, hot extrusion and other non-cutting and less-cutting processes are widely used in domestic and foreign manufacturing industries, and molds have become their main forming tools. It has developed rapidly in China, forming a series of mold steel steels mainly composed of cold work die steel, hot work die steel and plastic mold steel, of which plastic mold steel accounts for the largest proportion. [0003] There are many kinds of plastic products, auto parts such as: lampshades, instrument panels, optical instrument parts such as lenses, housings of household appliances, PVC daily-use plastic products, etc. Am...

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Problems solved by technology

[0006] Judging from the published relevant patents and steel types, the existing corrosion-resistant free-cutting plastic mold steels can be improved by adding S to Cr13 and Cr16 martensitic stainless steels. Machinability, but negatively affects pitting resistance

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