Corrosion resisting mirror plastic extrusion die steel

Abstract

The invention provides a corrosion resisting mirror plastic extrusion die steel, which comprises the following chemical components in percentage by weight: 0.18 to 0.26 percent of C, 0.20 to 0.40 percent of Mn, 0.80 to 1.20 percent of Si, 13.00 to 15.00 percent of Cr, 1.85 to 2.50 percent of Mo, 0.80 to 1.20 percent of Cu, 0.07 to 0.15 percent of V, less than or equal to 0.015 percent of P, less than or equal to 0.008 percent of S, less than or equal to 0.60 percent of Ni, less than or equal to 0.007 percent of N, and the balance of Fe and trace of impurities. The die steel belongs to an intermediate carbon martensitic stainless steel, residual carbides are few in an as-quenched state, so that a great deal of disperse carbides can be conveniently separated out by tempering, and the die steel has high secondary hardness and high-temperature strength; when the die steel is quenched and tempered, vanadium is separated out in a mode of M4C3 type carbide, and the stability, secondary hardness and high-temperature strength of the die steel are improved; the die steel has better antioxidation, heat resistance and mechanical processing property; in particular, the die steel has better surface polishing property and chloride ion corrosivity resistance below 500 DEG C, and long service life; therefore, the die steel can be widely used for manufacturing high-grade, precision and advanced plastic extrusion dies, tools, turbine blades, valves, shafts, fasteners and the like.

Description

(1) Technical field: [0001] The invention relates to the technical field of manufacturing metallurgical iron and steel materials, and belongs to the category of die steel. (two) background technology: [0002] In order to produce reinforced engineering plastic products (such as fiber-reinforced thermoplastic engineering plastic products) or thermosetting plastic extrusion molds, it is advisable to use a mold steel with good wear resistance. When the production volume is large, 4Cr5MoSiV1 and Cr12MoV are generally used. , Cr12MoV1 and other steel types, used after quenching and tempering. In order to improve the smoothness of plastic products and improve the wear resistance, corrosion resistance and service life of extrusion dies, the dies are generally prepared by surface treatment or plastic die steel. For example, 2Cr13, 3Cr17NiMoV, etc. are used, but because 2Cr13 has insufficient resistance to chloride ion corrosion, it is easy to produce point defects during use and ca...

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to solve the insufficient comprehensive performance of the existing plastic mold steel, make up for the defects of the above materials, and provide a steel with good oxidation resistance, heat strength and machining performance, as well as good surface polishing and durability. Chloride ion corrosion resistance below 500°C, long service life, good molding stability, new corrosion-resistant mirror plastic extrusion die steel