High-corrosion-resistance white cast iron and manufacturing method thereof

Abstract

A high-corrosion-resistant white cast iron and a manufacturing method thereof belong to the technical field of iron-carbon alloys. The chemical composition of the white cast iron in terms of mass percentage is as follows: C 21%-31%, Si 22%-30%, High carbon steel wire with Mn 3.5~6.5%, P<0.006%, S<0.005%, and the rest is Fe. The composition of the invention is novel, the production process is reasonable and clear, it provides the chemical composition ratio of the high-temperature-resistant and wear-resistant white cast iron, improves the shape of the carbide, improves the hardness and wear resistance of the casting, and strengthens the support of the matrix to the carbide It also stabilizes the high temperature hardness and wear resistance of castings; reduces the crack tendency of castings; improves the hardenability of castings. Its corrosion resistance is also better than that of existing white iron castings, and it is especially suitable as a wear-resistant workpiece working under high temperature conditions.

Description

technical field [0001] The invention belongs to the technical field of iron-carbon alloys, and relates to a white cast iron, in particular to a highly corrosion-resistant white cast iron and a manufacturing method thereof. Background technique [0002] Cast iron in which carbon exists in the form of cementite, its cross-section is off-white. It is a good anti-wear material and works under abrasive wear conditions. White cast iron includes ordinary white cast iron, low alloy white cast iron, medium alloy white cast iron and high alloy white cast iron. [0003] Ordinary white cast iron White cast iron with good wear resistance was made in China as early as the Spring and Autumn Period, and was used as some wear-resistant parts. This kind of cast iron has the characteristics of high carbon and low silicon, and has high hardness, but is very brittle. It is suitable for making parts with small impact load, and is generally used in plowshares, grinding discs, guide plates, etc. ...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the disadvantages of ordinary white cast iron such as poor corrosion resistance during use, the present invention proposes a highly corrosion-resistant white cast iron and a manufacturing method thereof. The composition of the white cast iron is more reasonable and the working life is longer. It is easier to manufacture, can greatly improve the mechanical properties of white cast iron, and can meet the needs of strong corrosion and other occasions