Vanadium-containing hypereutectic high-chromium cast iron and manufacturing method thereof

Abstract

The invention discloses a vanadium-containing hypereutectic high-chromium cast iron, belonging to the technical field of high-chromium cast iron, which is obtained through deoxidation treatment and inoculated by a bottom-packing punching method, and its chemical composition expressed in weight percentage is: carbon C3. 5~4.4%, manganese Mn 0.1~1.2%, chromium Cr15.5~21.5%, silicon Si0.5~1.5%, vanadium V5.5~7.5%, phosphorus P≦0.06%, sulfur S≦0.06%, and the rest iron. The cast iron can be used to manufacture parts subject to strong wear such as the flow parts of the slurry pump, the manufacturing method is simple and economical, the product quality is stable, and the cast iron has broad market prospects.

Description

technical field [0001] The invention relates to the technical field of high chromium cast iron. Background technique [0002] High chromium cast iron is a kind of important wear-resistant material that is widely used. It is widely used in various wear parts in the fields of metallurgy, mining, water conservancy, electric power, chemical industry, etc. impellers, jackets and guards). There is a large amount of high hardness M in the structure of high chromium cast iron 7 C 3 Type carbide, so it has excellent wear resistance. At the same time, because the eutectic carbide morphology is distributed in a rod shape, it is also improved in toughness compared with other white cast irons. The chromium in high chromium cast iron can not only effectively improve the corrosion resistance of the material in the slurry, but also a large amount of chromium-containing M 7 C 3 Type carbide effectively improves the wear resistance of the material and improves the service life of the wet...

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: the mold investment is large, and it is not suitable for the production of single-piece and small-batch slurry pump components; the maximum amount of inoculant that can be added is limited (generally no more than 1%, and the maximum is no more than 2%); The particle size of the agent is small, generally no more than 100um, and there are relatively many impurities such as oxides on the surface, but under the conditions of the invention, these impurities remain in the casting, which has an adverse effect on the toughness of the material

The disadvantages are: the amount of inoculant added is high, and impurities such as oxides on the surface generally remain in the casting, which has an adverse effect on the toughness of the material; in addition, the pouring temperature of this method is low, and the fluidity of the alloy liquid is not good. Well, it is not suitable for the production of complex parts such as slurry pump flow parts

[0010] In summary, although the prior art has research on vanadium-containing cast iron, hypereutectic cast iron and high-chromium cast iron, there are still various defects such as high cost, complicated process, narrow applicability, and unsatisfactory effect, especially the lack of A high wear-resistant, high toughness, high hardness material suitable for manufacturing wet parts and wear parts

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