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Medium chromium cast iron grinding ball
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Casting Grinding Balls
Casted Steel Balls
Cast steel ball is divided into ultra high chromium cast ball, high chromium cast ball, medium chromium cast ball, low chromium cast ball and chromium-free cast ball
The key to good and bad quality of the cast ball is the selection of raw materials and the control of the process. Even for the same specifications of the cast ball, the prices of different manufacturers will be very different, which is because of their different costs and processes. Cast steel balls have the advantages of high temperature resistance and little difference in internal and external hardness, which is especially suitable for the cement industry. At present, most of the cement industry chooses cast steel balls. But for other industries such as mines, thermal power stations, etc., forging steel balls have been used.
1. The impact toughness value is low, and the high chromium ball is only 3-6J / CM2;
2. The surface is not smooth enough, it is easy to be broken compared to the forged ball, and it is not suitable for the mill with a large diameter, especially above 3.5 meters
3. Casting grinding ball is only suitable for dry mill.
1.High chromium ball quality index
The chromium content of high chromium balls is 10.0% or more. The carbon content is between 1.80% and 3.20%. According to national standards, the hardness of high chromium balls must be not less than 58hrc, and the impact value should be greater than or equal to 3.0j / cm2. If this hardness is high, chromium balls must be quenched and tempered at high temperature. At present, there are two methods of domestic high chromium ball quenching, including oil quenching and wind quenching. If the high chromium ball test hardness is lower than 54HRC, it means that it has not been quenched.
2, quality index of medium chromium ball
The chromium spheres in are specified to have 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. National standards require that chromium ball hardness be greater than or equal to 47hrc. In order to ensure quality, medium chromium balls should be tempered at high temperature to eliminate 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 still has the metallic nature, we can judge that the steel ball has not been subjected to high temperature tempering treatment.
3.Quality index of low chromium ball
In general, low chromium balls contain 0.5% to 2.5% chromium and carbon content from 1.80% to 3.20%. Therefore, according to national standards, the hardness of the low chromium ball should not be less than 45hrc, and the impact value should be not less than 1.5j / cm2. Low chromium balls also require high temperature tempering to ensure quality. This treatment can eliminate casting stress. If the surface of the steel ball is dark red, it indicates that it has been subjected to high temperature tempering treatment. If the surface is still metallic, it indicates that the steel ball has not been subjected to high temperature tempering.
Cast steel balls are usually used in large-scale mining of various cement plants, chemical plants, power plants, quartz sand plants, silica sand plants, etc.
Production process flow | The Process Line of Production
Inspection of raw materials --- Proportioning materials --- Medium frequency furnace heating and melting --- Casting of steel molds --- Quenching treatment --- Tempering treatment --- Inspection --- Packaging
|Low-chromium casting strip||2.2-3.5||≤1.2||≤1.5||0.8-3.5||≤1.0||≤0.5||≤0.15||≤0.15|
|Medium-chromium casting strip||2.0-3.3||≤1.2||≤1.8||4.0-9.0||≤1.5||≤1.0||≤0.15||≤0.15|
|High-chromium casting strip||1.6-3.3||≤1.0||≤2.5||10-18||≤1.0||≤1.5||≤0.10||≤0.10|
|Super high-chromium casting strip||2.0-3.3||≤1.0||≤2.5||22-25||<2.0||≤1.5||≤0.10||≤0.10|
Mechanical properties and metallurgical structure
|Model||Mechanical properties||Metallurgical structure|
|HRC||The degree of ball-drop|
|Low-chromium casting strip||≥45||≥8000||P+C|
|Medium-chromium casting strip||≥50||≥12000||P+C|
|High-chromium casting strip||≥58||≥15000||
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Low chromium cast steel ball
Oriental Casting and Forging Co., Ltd.
Add：Zhangqiu, Shadong, China