Anticorrosive and antiwear cast cobalt-base alloy

Abstract

The present invention relates to Co-base alloy, especially, an anticorrosive and antiwear cast Co-base alloy. The alloy consists of C 1.0-2.5 wt%, Cr 20-35 wt%, W 5-20 wt%, Mo 1-6 wt%, Nb 1-8 wt%, Cu0.5-2.0 wt%, Si 0.5-3.0 wt%, Ni 2-15 wt% and Co 35-65 wt%. It has excellent anticorrosive performance and average hardness of about 48 HRC, and may be used in making cutter of water flow type chemical fiber cutting machine. Substituting partial Co with Ni can reduce the cost of the alloy.

Description

technical field [0001] The invention relates to a cobalt-based alloy, in particular to a cast corrosion-resistant and wear-resistant cobalt-based alloy. Background technique [0002] The cobalt-based alloy currently produced is mainly composed of Co-Cr-W-C quaternary alloy. Although it has good wear resistance and corrosion resistance, its performance in various strong corrosive media is not satisfactory. . In some industrial fields, alloys with high corrosion resistance, high wear resistance, high strength and toughness are required. For example, the cutting knife is the key component of the water flow chemical fiber cutting machine. The conditions of use are as follows: [0003] Cutting material: artificial cellulose; [0004] Contact medium: acidic water medium, PH value is 2, H 2 SO 4 Concentration 10~15g / L, Na 2 SO 4 Concentration 20~30g / L, H 2 S trace, Cl - 200ppm; [0005] Working temperature: 80~90℃; [0006] Load nature: pulse load, cutting frequency 200 t...

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Problems solved by technology

[0007] A chemical fiber industry head office was established in recent years. The complete set of equipment was imported from Australia and has been put into production. Among them, the key part of the water flow cutting machine, the cutting knife, is expensive and consumes a lot

At present, domestic knives used in the domestic chemical fiber industry are mostly cobalt-based alloys. Although the working temperature is very low (40-55°C), the service life has been unsatisfactory. Over the years, people have adopted various methods for the material of the cutting knives. Improving the performance and life of the cutting knife has not been effective. Among them: one type of alloy such as Stellite 6, its disadvantage is that the material wears quickly, and even the edge curls when sharpening the knife, indicating that the hardness of the material is insufficient; the other type Alloy, its disadvantage is that sawtooth appears on the blade during trial, indicating that the material has poor toughness and cannot be used

However, the cutting knife imported from abroad is a cobalt-based deformed material. When used under domestic production conditions, pitting corrosion often occurs, and the life specified in the contract cannot be reached. Therefore, it is urgent to develop a new material to solve the above problems.

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