A kind of cast iron with high dimensional stability and preparation method thereof

Abstract

The invention aims to provide cast iron and production technology method for casting by using the material. The cast iron is prepared from, by mass, 3.10-3.25% of C, 1.8-2.1% of Si, 0.94-1.15% of Mn, 0.03-0.07% of S, 0.25-0.34% of Cr, 0.5-0.7% of Cu, and the balance Fe, wherein the content of P is smaller than or equal to 0.07%; the carbon equivalent is 3.80-3.95% CE, and the ratio of silicon to carbon Si / C is 0.58-0.65. The high carbon equivalent is one of key points and is an important measure to reduce casting stress. The cast iron has the advantages of being high in dimensional stability, strength and elasticity modulus, low in stress, simple in production process, stable in cast iron quality and capable of meeting the requirement for manufacturing various equipment components.

Description

technical field [0001] The invention relates to the related technical field of cast iron materials, and in particular provides a cast iron with high dimensional stability, high strength, high elastic modulus and low stress and a casting production method of castings using the material. Background technique [0002] Modern equipment has higher and higher requirements on the performance of components, not only requiring them to have good mechanical properties, but also requiring them to have certain special properties. For example, important components such as the fuselage of some major equipment require good mechanical properties and thermal conductivity. , shock absorption, etc. At the same time, it is required to have high dimensional stability to maintain the dimensional accuracy and precision retention of the components, so as to achieve high precision and precision retention of the entire set of equipment. [0003] Gray cast iron has good mechanical properties, thermal c...

AI Technical Summary

Problems solved by technology

This method, while improving the strength, also increases the casting stress of the casting (usually above 60-80MPa), resulting in increased deformation of the casting and poor dimensional stability.

[0006] Simply increasing the carbon equivalent of gray cast iron will greatly reduce the mechanical properties of the material

For example, research has found that increasing the carbon equivalent (CE) of gray cast iron to 3.83-3.90% without taking other measures reduces the tensile strength of gray cast iron to about 270MPa, which cannot meet the performance requirements of HT300

Images