Low-alloy white cast iron

Abstract

The invention relates to a low alloy white cast iron, which can meet the special requirements of wearing pieces of cereals processing machines. The cast iron comprises the following chemical compositions according to the weight percentage: 3.5-3.8% of carbon, 1.5-1.9% of silicon, more than 0 and less than or equal to 1.0% of Mn, less than 0.05% of phosphorus, 0.02% of sulfur, more than 0 and less than or equal to 1.0% of chromium; the rest is Fe and unavoidable trace impurity elements. The white cast iron is in line with the performance provision of the wearing pieces of the cereals processing machines and has better mechanical work and casting combination property compared with the high hardness wear-resistant white cast iron (Patent CN1019029B). The white cast iron has the advantages of easy controllable components, little alloy, low production cost and fine foundry processing property, thus better in favor of industrialization application, etc.

Description

technical field [0001] The invention relates to a low-alloy white cast iron, in particular to a low-alloy white cast iron that can meet the requirements of wear-resistant parts of grain processing machinery. Background technique [0002] The cast iron used to resist abrasive wear is generally used in the white state, and its structure is a strong metal matrix supporting hard carbides, so that the cast iron can resist wear. Depending on the conditions of use, white cast iron can be alloy-free, or it can contain low, medium, or high amounts of alloying elements. my country has formulated a national standard for wear-resistant white cast iron (GB8263-87). The material composition of the standard grades is generally shown in Table 1. [0003] Table 1 Material composition (weight percent) of standard grades (the balance is iron) [0004] [0005] The hardness is generally HRc53-58, and the high-hardness alloy white wear-resistant cast iron of the patent CN1019029B is compos...

AI Technical Summary

Problems solved by technology

However, it is difficult to purchase low-silicon pig iron with existing materials. The hardness is too high and difficult to process, which does not meet the technical requirements. Moreover, the castings produced by existing materials tend to have large cracks, which is not suitable for large-scale production.

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