Ledeburite malleable cast iron with high tenacity

Abstract

The ledeburite malleable cast iron with high toughness belongs to the field of casting technology. It is composed of the following raw materials in mass percentage, C 0.07%, Si 0.25%, Mn 0.2%, S 0.01%, P 0.02%, Cr 2.2%, Mo 1.2%, V 0.65%, Nb 0.12%, RE 0.08%, Ni 0.14%, W 0.36%; the rest is Fe and impurities. The composition of the invention is novel, the service life is greatly improved, the use cost is greatly reduced, the use range is expanded, and the large impact load can be effectively solved. Surface carburizing treatment is carried out on it, and surface quenching treatment is carried out after carburizing, and its toughness and fatigue strength have been greatly improved. The stress on the surface is reduced, and the service life of malleable cast iron has been greatly improved, which meets the needs of various stress concentrations and high impact loads.

Description

technical field [0001] The invention belongs to the technical field of casting, and relates to a malleable cast iron, in particular to a ledeburite malleable cast iron with high toughness. Background technique [0002] Cast iron is a general term for alloys mainly composed of iron, carbon and silicon. Cast iron can be divided into: gray cast iron, white cast iron, malleable cast iron, nodular cast iron, vermicular cast iron and alloy cast iron. [0003] Malleable cast iron White cast iron is a kind of high-strength and tough cast iron obtained by graphitization annealing. It has high strength, plasticity and impact toughness, and can partially replace carbon steel. Compared with gray cast iron, malleable cast iron has better strength and plasticity, especially better low-temperature impact performance, and better wear resistance and vibration damping than ordinary carbon steel. Because of its certain plasticity and toughness, this kind of cast iron is commonly known as ma...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of insufficient wear resistance of traditional cast iron parts due to insufficient surface hardness in wearing occasions, the present invention provides a ledeburite malleable cast iron with high toughness, without adding additional processing steps and processing costs. Obtain high toughness, which can meet the use of high-demand occasions