High-carbon chromium bearing steel for railway truck bearing and preparation method

Abstract

The invention relates to high-carbon chromium bearing steel for a railway truck bearing. The high-carbon chromium bearing steel for the railway truck bearing is characterized in that product elementsC, Si, Mn, Cr and Al have the same requirements on technical conditions with vacuum degassed high-carbon chromium bearing steel for a traditional railway truck bearing. Hairlines longer than 0.6 mm donot exist through detection by a tower shape method; a metallographical method is adopted to detect that the B fine system of microcosmic brittle inclusions is not more than 1.5 grade, the B thick system is not more than 0.5 grade, the D fine system is not more than 0.5 grade, the D thick system is not more than 0.5 grade and the DS system is not more than 1.0 grade; the metallographical method is adopted to detect without allowing existence of microcosmic holes; the center porosity of a macrostructure is not more than 1.0 grade; the general porosity is not more than 1.0 grade; the ingot segregation is not more than 1.0 grade; and the metallographical method is adopted to detect that the carbide liquation is not more than 0 grade, the carbide strip shape is not more than 2.0 grade and thecarbide net shape is not more than 2.5 grade. The high-carbon chromium bearing steel belongs to excellent bearing steel with high purity, high structure uniformity and high compactness.

Description

technical field [0001] The invention relates to the technical field of bearing steel production, in particular to a high-carbon chromium bearing steel for railway wagon bearings and a preparation method thereof. Background technique [0002] At present, the high-carbon chromium bearing steel used for railway freight car bearings in China is produced by electroslag remelting process, and has a history of more than 30 years. Since the steel produced by the electroslag remelting process has many quality advantages such as fine and uniform distribution of non-metallic inclusions, high structure uniformity and high density, its quality stability has always been good, and it can meet the performance requirements of railway freight car bearings . However, the electroslag remelting production process also has obvious disadvantages such as production efficiency, very low production capacity, very high energy consumption and production costs. Therefore, the market competitiveness of ...

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Problems solved by technology

However, the electroslag remelting production process also has obvious disadvantages such as production efficiency, very low production capacity, and very high energy consumption and production costs. Therefore, the market competitiveness of electroslag remelting steel is very low

In 2006, the market demanded the vacuum degassed high-carbon chromium bearing steel technology for railway wagon bearings, but domestic steel mills did not succeed in trial production for many times.

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