Cast high chrome balls are important consumables used in industrial 

fields such as grinding and grinding, especially in mining, metallurgy,

cement and other industries as grinding media. In order to make it

have excellent wear resistance, hardness and impact resistance, cast

high chrome balls need to undergo precise heat treatment processes.

When we introduce the product, many customers will ask why cast

high chrome balls need to be heat treated. Today, the relevant

technical personnel of our factory will give you a detailed

introduction to the reasons why cast high chrome balls need to be

heat treated.

What is heat treatment of cast high chrome balls?

The so-called heat treatment is the process of heating, heat

preservation and then cooling the cast high chrome balls.

After such a process, the internal structure of the cast high

chrome balls will undergo certain changes, so as to achieve

the desired performance.

Heat treatment can significantly improve the hardness and wear

resistance of the cast balls by controlling their microstructure.

This structure has a high hardness at the beginning, but it is

more brittle and prone to cracks and breakage. Through

annealing treatment, the internal stress of the casting can be

effectively eliminated, its organizational structure can be

improved, and it can be made more uniform, thus creating

conditions for the subsequent quenching and tempering process.

The wear resistance and impact resistance of the cast ball after

annealing have been significantly improved.

Quenching is a key step in heat treatment. Quenching is to heat the

cast ball to the austenite temperature (usually 950~1050°C), and then

quickly immerse it in water or oil to quench it, so that it transforms

from austenite to martensite, forming a microstructure with higher

hardness. The hardness of the high chromium cast grinding balls after quenching

can usually reach more than 60HRC, which significantly improves its wear

resistance.

However, although the hardness of the cast ball after quenching is extremely

high, its toughness is poor and it is prone to brittle cracking. In order to improve

this problem, tempering treatment is essential. Tempering can eliminate the

internal stress generated during quenching by heating the cast ball to a certain

temperature (usually 200~500°C) and keeping it warm for a certain period of

time, adjust the balance between hardness and toughness, and make the cast

ball more stable under high impact and high load conditions.

Cryogenic treatment is an optional process. By cooling the cast ball to a low

temperature (usually -70~100°C), it can further refine the grains, reduce

residual austenite, and improve the hardness and wear resistance of the cast ball.

The heat treatment process of cast grinding media ball  is a key step to ensure that

their performance reaches the best state. Our factory has its own set of processes

and technologies for heat treatment of cast high chrome balls. Years of experience

have also allowed us to have different final treatment methods for grinding media

balls of different specifications, different materials, and different production processes,

but the wear resistance and environmental protection of grinding media balls after the

final treatment have been greatly improved.