Ultra-Hard Ultra-High-Chromium Cast Steel Balls
1. Unrivalled wear resistance, leading the industry in wear performance.
The high proportion of hard chromium carbides delivers top-tier wear resistance, with a service life over 30 per cent longer than that of standard high-chromium Cr10 balls. Extremely low wear significantly extends the ball replenishment cycle, reducing the frequency of downtime for replenishment and lowering labour and maintenance costs, making it ideal for long-cycle continuous production scenarios.
2. Strong corrosion resistance, suitable for extreme slurry conditions.
The high-chromium matrix forms a dense and stable passivation layer, providing far superior resistance to electrochemical corrosion from strong acids, strong alkalis and high-sulphur slurries compared to standard high-chromium balls. Under highly corrosive wet mineral processing conditions, there is no surface spalling or pitting, and the leaching of iron powder impurities is minimal, ensuring high metal recovery rates in downstream flotation processes.
3. Excellent performance in high-temperature dry grinding.
The balls demonstrate outstanding hardness retention in high-temperature environments, making them suitable for high-temperature dry grinding applications such as cement clinker grinding and high-temperature pulverisation of coal powder in power stations. They do not suffer from matrix softening or accelerated wear due to sustained high temperatures, making them the standard grinding media for high-end dry grinding processes.
4. Dense microstructure with extremely low breakage rate.
Strict control of sulphur and phosphorus impurities, combined with a comprehensive stepwise heat treatment process, ensures the spheres are free from casting defects such as porosity or shrinkage cavities, resulting in excellent resistance to impact fatigue. Even during long-term operation in mills with high drop heights and severe impact loads, breakage is extremely rare, eliminating the risk of large fragments blocking the discharge grate.
5. Specifically tailored for high-end operating conditions.
Primarily used in scenarios demanding the utmost in wear resistance and purity, such as the highly corrosive wet beneficiation of precious metal ores (gold, silver), the fine grinding of high-hardness non-ferrous metal ores, clinker grinding in large-scale cement production lines, high-temperature dry powder processing, and the grinding of highly corrosive chemical raw materials.
6. Mechanical Properties Surface hardness:
HRC 60–66; hardness difference between the spherical surface and the ball core ≤ 2 HRC
Impact toughness: aₖ ≥ 3.5 J/cm²
Microstructure: Martensitic matrix + a large number of finely dispersed, high-hardness chromium carbides
Heat treatment process: Precision temperature-controlled oil quenching + multi-stage high-temperature tempering, thoroughly eliminating casting internal stresses
Breakage rate under compliant operating conditions: ≤0.5%
