The Classification of Steel Ball
The Classification of Steel Ball
There are two kinds of steel ball, casting steel ball and forging steel ball. Casting ball manufacturers mix scrap steel, scrap metal and other waste metals in intermediate frequency electric stove for heating so as to fully melting. Right amount precious metal alloy, such as ferrochrome, ferromanganese, vanadium iron are added in melting process. When temperature is above 1550 ℃, powering hot metal to the steel mold or mold steel ball production line. This kind of ball is called casting steel ball or casting grinding ball. 10.0% or higher chromium content, carbon content between 1.80% and 3.20% are called high chrome alloy casting ball. After quenching process, the hardness of high chromium alloyed casting ball must be more than 58 HRC and impact value 3.0 J/cm2, according to national standard and requirement. Forging steel ball manufacturers made steel ball through direct heating and forging way. It doesn't need smelting process. Compared with casting steel ball, chromium content is much lower, between 0.1% 0.5%. Carbon content is below 1.0%. surface hardness of forging steel ball canreach more than 56. Hardening layer is around 15 mm due to poor harden ability and the core hardness is typically more than 30 degrees. The harden ability is difference with the increase of steel ball diameter. Normally forging steel ball often adopts the water quenching treatment. The higher hardness, the better wear resistance and corrosion resistance of steel ball. After quenching and tempering treatment of high chromium balls, the hardness can reach 60 or more. That’s why the wear resistance of casting ball is 2.5 times of that of forging steel ball.
There are two kinds of steel ball, casting steel ball and forging steel ball. Casting ball manufacturers mix scrap steel, scrap metal and other waste metals in intermediate frequency electric stove for heating so as to fully melting. Right amount precious metal alloy, such as ferrochrome, ferromanganese, vanadium iron are added in melting process. When temperature is above 1550 ℃, powering hot metal to the steel mold or mold steel ball production line. This kind of ball is called casting steel ball or casting grinding ball. 10.0% or higher chromium content, carbon content between 1.80% and 3.20% are called high chrome alloy casting ball. After quenching process, the hardness of high chromium alloyed casting ball must be more than 58 HRC and impact value 3.0 J/cm2, according to national standard and requirement. Forging steel ball manufacturers made steel ball through direct heating and forging way. It doesn't need smelting process. Compared with casting steel ball, chromium content is much lower, between 0.1% 0.5%. Carbon content is below 1.0%. surface hardness of forging steel ball canreach more than 56. Hardening layer is around 15 mm due to poor harden ability and the core hardness is typically more than 30 degrees. The harden ability is difference with the increase of steel ball diameter. Normally forging steel ball often adopts the water quenching treatment. The higher hardness, the better wear resistance and corrosion resistance of steel ball. After quenching and tempering treatment of high chromium balls, the hardness can reach 60 or more. That’s why the wear resistance of casting ball is 2.5 times of that of forging steel ball.