Low-defect fine-grain low-carbon alloy steel and casting method and application thereof

Abstract

The invention discloses low-defect fine-grain low-carbon alloy steel, which comprises the following raw materials in percentage by mass: 0.31 to 0.45 percent of C; si: 0.41 to 0.65%; mn: 0.53 to 0.77%; 0.61 to 0.71 percent of Mo; s: < = 0.005%; p: < = 0.005%; 1.55% to 2.25% of Cr; ni: less than or equal to 0.35%; 0.30% or less of Cu; 0.43 to 0.63 percent of V; mg: 0.22 to 0.32%; fe: the balance. The invention further discloses a casting method and application of the low-defect fine-grain low-carbon alloy steel. According to the low-defect fine-grain low-carbon alloy steel and the casting method and application thereof, the low-defect fine-grain low-carbon alloy steel has the beneficial effect of being low in casting defect and free of obvious casting defects such as looseness, porosity and composition segregation, and the grain size is 10-12 grades.

Description

technical field [0001] The invention relates to a low-defect fine-grained low-carbon alloy steel, a casting method and application thereof, and belongs to the technical field of low-carbon alloy steel casting. Background technique [0002] The manufacturing quality of large construction machinery is related to the country's equipment manufacturing level and is the foundation of the country's equipment manufacturing. Large-scale low-carbon alloy steel castings are widely used in various fields because of their good mechanical properties and welding properties, such as construction machinery, petrochemical, national defense engineering, rail transit and other industries. Low carbon alloy steel castings are required to manufacture, and its wide application represents the development level of a country in the manufacturing industry. Among them, construction machinery, petrochemical industry and rail transit are widely used. The assembled equipment in these fields is composed of...

AI Technical Summary

Problems solved by technology

However, due to the complex structure of key equipment parts in many industries, low-carbon alloy steel needs to be processed by casting

Although the production technology of large-scale low-carbon alloy steel castings produced in my country has made considerable progress, there are still many casting defects in the castings, and the quality of the castings still needs to be further improved.

Due to the high melting point of the casting, the liquid steel has a high viscosity during casting and a large shrinkage rate during solidification, and many casting defects will occur during the casting process, such as coarse grains, inclusions, composition segregation, loose pores, etc. Once these defects occur , it will consume a lot of manpower and material resources, and even cause serious safety accidents

Therefore, those skilled in the art urgently need to study a low-defect fine-grained low-carbon alloy steel and its casting method and application, so as to solve the problems of coarse grains and many casting defects in the casting process of low-carbon alloy steel.

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