A high-strength, low-sulfur, high-manganese inoculated gray cast iron material and its melting and pouring process

Abstract

The invention relates to a high-strength, low-sulfur, high-manganese inoculated gray cast iron material. The components of the gray cast iron material are represented by weight percentage: carbon 3.05-3.2%, silicon 1.85-2.05%, manganese 0.8-1.4%, phosphorus ≤ 0.05%, sulfur <0.05%. It also provides a production process for producing the high-strength, low-sulfur, high-manganese inoculated gray cast iron material. The present invention not only adopts synthetic cast iron technology, but also uses silicon carbide and silicon barium zirconium inoculants, and utilizes iron molds covered with sand to cast Under the mold conditions, high-strength low-sulfur high-manganese inoculated gray cast iron was cast.

Description

technical field [0001] The invention relates to the field of casting, in particular to a high-strength, low-sulfur, high-manganese inoculated gray cast iron material and a melting and pouring process thereof. Background technique [0002] Gray cast iron refers to cast iron with flake graphite. Because the fracture is dark gray when broken, it is called gray cast iron, and its output accounts for more than 80% of the total output of cast iron. Gray cast iron is divided into ferrite matrix gray cast iron, pearlite-ferrite matrix gray cast iron, and pearlite matrix gray cast iron. Different gray cast irons can be used according to the different directions of castings to meet the requirements of use. They are generally used in hydraulic parts. Gray cast iron with a pearlitic matrix is ​​required. [0003] The sampling part of the hydraulic parts is close to the middle of the solid part of the casting. Multiple samplings have found that there are problems such as low hardness, l...

AI Technical Summary

Problems solved by technology

However, the sulfur content of existing gray cast iron is above 0.05%, and the gray cast iron molded after mixing with Mn and other components has low strength and unstable graphite form

[0004] Moreover, the existing gray cast iron only uses one inoculation during smelting and pouring, and ferrosilicon inoculant is generally used for inoculation, so that the purity of molten iron is low and the graphite grains are too large

[0005] Moreover, the existing gray cast iron mold is single, and the core strength of thick and large pieces is difficult to meet the requirements

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