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Heat treatment of high-chromium (High-Cr) cast iron grinding balls, typically involving air quenching (950–1050°C) and tempering (200–400°C), aims to transform the as-cast austenitic structure into martensite and
carbides. This process maximizes wear resistance (HRC 58-62) and reduces breakage in cement and mining applications.
Key Heat Treatment Processes for High-Cr Cast Iron Balls:
- Optimal Process (General): Quenching at for 3 hours followed by tempering atfor 3 hours ensures high impact toughness and wear resistance.
- Alternative Process (High Hardness): Oil quenching from followed by tempering atimproves impact toughness by 55% and hardness by 26% over the as-cast state.
- Alternative Process (High Cr - Cr28): Involves a complex cycle: Quench (1000-1050°C) High-temp Temper (710-730°C)Second Quench (1000-1050°C)Low-temp Temper (450-500°C).
Microstructure and Properties Goals:
- Microstructure: The goal is a fine, high-hardness martensite matrix with uniformly dispersed carbides and minimal retained austenite.
- Hardness & Toughness: Heat-treated balls generally achieve a surface and core hardness above HRC 58, with improved impact values, often 3.9–6.7 .
Common Production Steps:
- Heating/Homogenization: Balls are heated to 900–1050°C and held to transform the structure.
- Quenching: Air quenching is common, but oil quenching may be used for specific toughness requirements.
- Tempering: Generally performed around 200–400°C to reduce residual stresses while maintaining high wear resistance.
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The characteristics of heat treatment process for high ...
nghexin.com
https://www.nghexin.com › heat-treatment-process-for-c...
nghexin.com
https://www.nghexin.com › heat-treatment-process-for-c...
The toughness of cast iron ball was improved by adding 30h ~ 5% scrap. If on the basis of casting 14-cast 1880 %, adding 20% iron, the white layer of iron ball ...Read more
Optimizing heat treatment and wear resistance of high ...
ScienceDirect.com
https://www.sciencedirect.com › article › abs › pii
ScienceDirect.com
https://www.sciencedirect.com › article › abs › pii
by E Albertin2011Cited by 35 — The properties of the metallic matrix are fundamental to obtain high wear resistance. The example shown in Fig. 1 refers to cast irons tested as grinding balls ...Read more
Optimizing Heat Treatment for High Chromium Grinding ...
ZHY Casting
https://www.zhycasting.com › optimizing-heat-treatment-...
ZHY Casting
https://www.zhycasting.com › optimizing-heat-treatment-...
Apr 11, 2026 — The data unequivocally demonstrates that heat treatment profoundly alters the properties of high chromium grinding balls produced by sand coated ...Read more
CN1150977A - High-chromium cast-iron grinding ball and ...
Google Patents
https://patents.google.com › patent
Google Patents
https://patents.google.com › patent
A high-Cr cast iron grinding ball as pulverizing medium contains such chemical components (Wt.%) as C (2.0-3.0), Mn (less than 1.50), Cr (11.0-16.0), ...
(PDF) Effect of Heat Treatment on the Hardness and Wear ...
ResearchGate
https://www.researchgate.net › publication › 32018737...
ResearchGate
https://www.researchgate.net › publication › 32018737...
Mechanical properties, wear resistance and impact resistance of a high-alloy chromium cast iron used in the fabrication of grinding balls have been studied.Read more
High Chrome Cast Grinding Balls - Ferro Alloy Manufacturer
hsferroalloy.com
https://hsferroalloy.com › News
hsferroalloy.com
https://hsferroalloy.com › News
Jul 30, 2025 — Heat Treatment. To enhance hardness and toughness, the cast balls undergo high-temperature quenching followed by tempering. This heat ...Read more
Heat Treatment Techniques for Grinding Balls - NINGHU
nhgrindingball.com
https://www.nhgrindingball.com › knowledge › heat-tre...
nhgrindingball.com
https://www.nhgrindingball.com › knowledge › heat-tre...
May 20, 2024 — High-chromium prepares are generally utilized for crushing media balls in applications where scraped spot opposition is basic. Molybdenum (Mo): ...Read more
grinding balls by laboratory impact and abrasion tests
911Metallurgist
https://www.911metallurgist.com › 2016/10 › Gr...
911Metallurgist
https://www.911metallurgist.com › 2016/10 › Gr...
PDF
Our previous research (Blickensderfer, et al., 1983) showed that the impact resistance of high-chromium white cast iron is greatly affected by heat treatment.Read more
7 pages
Cast iron grinding ball of Heat Treatment on Structure and ...
nghexin.com
https://www.nghexin.com › influence-of-heat-treatment-...
nghexin.com
https://www.nghexin.com › influence-of-heat-treatment-...
The 80mm high chrome cast iron grinding ball was prepared by air cooling at 980 °C × 3h and tempering at 400 °C × 3h. Then produce a batch of high-chromium cast ...Read more
The Hardening-Toughening Heat Treatment Process Of High ...
ngdxtech.com
https://www.ngdxtech.com › ...
ngdxtech.com
https://www.ngdxtech.com › ...
Oct 12, 2021 — After the ball was austenitized at 980 °C for 150 min + 920 °C for 30 Min, and then put into a salt bath furnace at 260 °C for 30 min and 50 Min ...Read more