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What are the types of cast steel balls

Update:23-05-2022
Summary:

Carbon Steel Ball can be divided into three categories […]

Carbon Steel Ball can be divided into three categories including high chromium balls, medium chromium balls and low chromium balls.

1. Quality index of high chromium ball

The chromium content of high chromium balls is greater than or equal to 10.0%. The carbon content is between 1.80% and 3.20%. According to national standards, the hardness of high chromium balls must not be less than 58hrc, and the impact value should be greater than or equal to 3.0j/cm2. To achieve this hardness, high chromium balls must be quenched and tempered at high temperature. At present, there are two methods for quenching high chromium balls in China, including oil quenching and wind quenching. If the test hardness of the high chromium ball is lower than 54HRC, it means that it has not been quenched.

2. Quality index of medium chrome ball

Medium chromium balls are specified with a chromium content ranging from 3.0% to 7.0% and a carbon content between 1.80% and 3.20%. Its impact value should not be less than 2.0j/cm2. The national standard requires that the hardness of chromium balls should be greater than or equal to 47hrc. In order to ensure the quality, the medium chromium ball should be tempered at high temperature to eliminate the casting stress.

If the surface of the steel ball is black and red, it proves that the steel ball has been tempered at high temperature. If the surface of the steel ball is still metallic, we can judge that the steel ball has not been tempered at high temperature.

3. Low chromium ball quality index

Generally speaking, low chromium balls contain 0.5% to 2.5% chromium and 1.80% to 3.20% carbon. Therefore, according to the national standard, the hardness of the low chromium ball should not be less than 45hrc, and the impact value should not be less than 1.5j/cm2. Low chromium balls also require high temperature tempering to ensure quality. This treatment relieves casting stress. If the surface of the steel ball is dark red, it indicates that it has been tempered at high temperature. If the surface is still metallic, it means that the steel ball has not been tempered at high temperature.

Cast steel balls are usually used in various cement plants, chemical plants, power plants, quartz sand plants, silica sand plants, etc. for large-scale mining.