White cast iron with anti-fracture property and heat treatment technology

Abstract

White cast iron with anti-fracture performance and heat treatment process, belonging to the technical field of iron-carbon alloys, the chemical composition in terms of mass percentage is as follows: C 2.0-2.8%, Si 0.6-0.9%, Cr 6.0-7.0%, Mn 0.2 ~0.38%, Ni 3.6~4.2%, Mo ≤0.98%, P ≤0.045%, S ≤0.06%, Fe balance. The composition of the invention is novel, the production process is reasonable and clear, through two times of quenching and tempering, and the quenching and tempering temperature is determined through experiments, and the treatment is carried out at this temperature, which can greatly improve the toughness and wear resistance of nickel hard white cast iron , so that the cast iron is not easy to produce cracks during use, which improves the service life. The hardness after heat treatment in the as-cast state reaches 53HRC, and greatly saves the processing time of heat treatment and improves production efficiency.

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 white cast iron with fracture resistance and a heat treatment process. 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. Heat tr...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the disadvantages of ordinary white cast iron such as low toughness, low impact resistance, and poor fracture resistance during use, the present invention proposes a white cast iron with fracture resistance and a heat treatment process. The composition of the white cast iron is more reasonable, Longer working life, easier manufacture, can greatly improve the mechanical properties of white cast iron, and can meet the needs of strong impact and other uses