Vanadium niobium composite alloying cold working die steel and preparation thereof

Abstract

The invention provides cold-working mould steel of vanadium and niobium composite alloying, which comprises the components with mass percent as follows: 5.0 percent to 12 percent of V, 0.2 percent to 5.0 percent of Nb, 2.2 percent to 2.8 percent of C, less than or equal to 1.3 percent of Si, 0.2 percent to 0.9 percent of Mn, 4.0 percent to 5.6 percent of Cr, less than or equal to 1.00 percent of W, less than or equal to 6.00 percent of Mo and the balance of ferrite and impurities. The invention also provides a method for preparing the cold-working mould steel of vanadium and niobium compositealloying. The cold-working mould steel of vanadium and niobium composite alloying has high wear resistance and high toughness. The hardness of the steel can reach 58 to 65 HRC after quenching and tempering heat treatment. The MC-typed carbide in the steel takes diffuse distribution state, and the MC-typed carbide phase has volume fraction of 13 to 20 percent and average diameter of 1 to 4 Mu m.

Description

technical field [0001] The invention relates to a vanadium-niobium composite alloyed cold work die steel, in particular to a vanadium-niobium composite alloyed cold work die steel with high wear resistance and high toughness. The invention also relates to a preparation method of the cold work die steel. Background technique [0002] Due to the high efficiency and economy of using molds for processing and molding, the application of molds in the material processing and molding industry is very common. During the service of the mold, its behavior is affected by various factors, such as the shape design of the mold, the processing quality of the mold, the special treatment of the surface of the mold, the actual working parameters of the mold, etc., among which the most influential is the choice of the mold itself. s material. For cold work mold materials, wear resistance, impact toughness, and hardness are the three most important performance parameters. According to differen...

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Problems solved by technology

Although recent studies have shown that the technical solution of composite alloying is expected to further improve the comprehensive performance of cold work die steel, however, due to the use of high-cost elements such as cobalt and chromium in the prior art composite alloyed cold work die steel, Resulting in higher cost of cold work die steel obtained

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