manufacturing process of casting grinding ball, rolling ball, forging ball
View More →A general information about casting grinding ball mold
View More →High chromium white cast iron grinding ball is also known as high chromium alloy cast ball, high chromium steel ball, simply called high chromium ball. At present, most of the domestic wear-resistant material enterprises are medium frequency electric furnace as the main body, through the reasonable matching of high quality scrap steel, chromium alloy material melting; As well as microalloying treatment and conditioning of hot iron; Then with a unique metal mold, sand mold casting molding process; After high temperature quenching and tempering, the martensite matrix was obtained to achieve higher hardness and wear resistance.
View More →Forged steel ball is manufactured by steel ball manufacturers through direct high temperature heating and then adopt the method of forging steel ball, chromium content is 0.1% ~ 0.5%, carbon content is less than 1.0%, after high temperature forging manufacturing, the surface hardness (HRC) can reach more than 56, but due to poor hardenability of material, quenching layer is only about 15㎜, Therefore, the hardness of the heart is generally only more than 30 degrees, and the greater the diameter of the steel ball, the worse the hardenability. Therefore, under normal circumstances, forged steel balls are treated by water quenching.
View More →The as-cast hardness of thick-walled parts can not be too high, which is 50-55HRC, but the thin-walled parts are better. There is to add a certain amount of nickel and molybdenum, and then the silicon content can not be too high, these are influencing factors. It should be possible to increase the hardness of cast to about 55HRC. Only the composition adjustment in the as-cast cooling to achieve the transformation of austenite to martensite can improve the hardness. Because its carbide hardness is also very high.
View More →Effect of quenching temperature on microstructure and hardness of high chromium steel balls High chromium steel balls are widely used in mining and cement industries because of their excellent wear resistance and are considered to be the best grinding medium. With many years of experience in developing and producing high chromium steel balls, we found that heat treatment process is one of the most important key points to improve the performance of grinding balls. The effect of quenching temperature on the microstructure and hardness of the cast grinding ball during heat treatment will be discussed.
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