I will tell why do the grinding balls break up, hoping useful for you.
1. Chemical constituent
Due to different working conditions, grinding ball material is various. There
are low chrome grinding ball, mid chrome grinding ball, high chrome grinding
ball and special high chromium ball, etc. Each grinding ball have different
chemical constituent which directly affect material properties.
2. Heat treatment process
It reflected that heat treatment process is incorrect or not strictly
enforced. Cast iron grinding balls haven’t been eliminated stress, high chrome
ball unreasonable microstructure and too high retained austenite. Currently wind
quenching residual austenite of high chrome ball is generally 15% --30%. In the
course of austenite transfer into martensite, grinding ball volume is expansion
and its internal stress increasing, thus the grinding ball surface get flaking
in wear.
3. High gas content in molten iron.
If no deoxidation before casting or mold exhaust is not so good, the water
break down into hydrogen and oxygen at high temperatures, porosity generated
inside the ball will reduce strength.
4. Molten iron and iron slag are not separated clean, causing slag hole in
ball, which also reduces strength itself.
5. The scrap production process is not strictly managed, the inferior waste
low melting point metal material such as lead, zinc and other content exceeded,
is prone to breaking.
