Niobium alloy cast iron brake disk material and technique for producing the same

Abstract

The invention relates to a material for a niobium alloy cast iron braking disc and a production technology thereof, and belongs to the field of production technology of high-carbon equivalent hypereutectic gray cast iron. The material for the niobium alloy cast iron braking disc comprises the following chemical compositions in weight percentage: 3.7 to 3.9 percent of carbon, 1.8 to 2.2 percent of silicon, 0.5 to 0.8 percent of manganese, less than or equal to 0.08 percent of sulfur, less than or equal to 0.60 percent of copper, less than or equal to 0.20 percent of nickel, less than or equal to 0.05 percent of vanadium, less than or equal to 0.05 percent of stannum, less than or equal to 0.05 percent of titanium, less than or equal to 0.25 percent of chrome molybdenum, 0.08 to 0.3 percent of niobium, and the balance being iron, wherein the iron is melted by an intermediate frequency furnace. The structure of the material is characterized by comprising pearlite, graphite (A3-5), and a small amount of ferrite The performance characteristics of the material are as follows: the hardness HB is more than or equal to 150 and the tensile strength is more than or equal to 170 N/mm<2>. The material is suitable for braking discs for medium-to-high grade sedans made of gray cast iron, and has the advantages of stable performance, low cost, longer service life, and convenient processing.

Description

technical field [0001] The invention relates to a material of a niobium alloy cast iron brake disc and a production process thereof, belonging to the technical field of high carbon equivalent hypereutectic gray cast iron production. Background technique [0002] The use of niobium in cast iron is an emerging technology, at least compared to the use of niobium in steel. The topic of niobium-containing cast iron was not addressed in the "Niobium-International Academic Conference" held in 1981. In recent years, the application of niobium in various cast irons has been greatly developed. So far, some of the most important applications of niobium in cast iron mainly include two aspects. One is the automotive industry, such as cylinder heads, piston rings and brakes. etc.; the second is the metallurgical industry, such as high-temperature wear-resistant materials such as rolls. Niobium has been used in gray cast iron, white cast iron and mottled cast iron, especially in gray cas...

AI Technical Summary

Problems solved by technology

However, complex preparation process, expensive manufacturing cost and unstable performance restrict the wide application of these new materials in brake discs. Cast iron has good shock abso

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