High chromium steel balls and low chromium steel balls belong to wear-resistant cast iron grinding balls, and the core difference lies in the difference in chromium content, which leads to significant differences in composition, performance, process, and application scenarios.
|
1 . Product Type |
Cr % |
Hardness |
Falling ball times |
impact value (ak(J/cm²) |
Microstructure |
|
Low chromium steel ball |
1-3 |
≥45 |
≥8000 |
≥2.0 |
P+C |
|
Medium chromium steel ball |
3-7 |
≥48 |
≥9000 |
≥2.5 |
P+C |
|
High chromium steel ball |
10-13 |
≥58 |
≥18000 |
≥3.0 |
M+C |
|
Ultra high chromium steel ball |
13-30 |
≥60 |
≥20000 |
≥4.0 |
M+C |
2 . chemical composition %
|
Grade |
化学成份 Chemical composition(%) |
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|
C |
Si |
Mn |
Cr |
P |
S |
Mo |
Cu |
Ni |
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|
Cr13 |
2.0-3.2 |
0.3-1.2 |
0.8-1.3 |
10-13 |
≤0.10 |
≤0.10 |
0-2.0 |
0-1.0 |
0-1.5 |
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|
Cr17 |
2.0-3.0 |
0.3-1.2 |
1.0-1.5 |
15-18 |
≤0.10 |
≤0.10 |
0-2.0 |
0-1.0 |
0-1.5 |
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|
Cr20 |
2.0-2.8 |
0.3-1.0 |
1.0-2.0 |
18-22 |
≤0.10 |
≤0.08 |
0-2.5 |
0-1.0 |
0-1.5 |
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|
Cr26 |
2.0-2.8 |
0.3-1.0 |
1.0-2.2 |
22-28 |
≤0.10 |
≤0.08 |
0-3.0 |
0-2.0 |
0-1.5 |
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|
硬 度 (HRC) |
冲击值 ak(J/cm²) |
落 球 冲 击 疲 劳 寿 命 ( 次 数 ) Falling bal1 impact fatigue life |
金相组织 Netallographic organization |
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|
56-62 |
>3.0 |
>13000 |
M+C |
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|
M- 马氏体C-碳化物M-Marten site C-Carbide |
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|
产品规格(mm) Specification |
Ø8 |
Ø10 |
Ø12.5 |
Ø15 |
Ø17 |
Ø20 |
Ø25 |
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|
ø30 |
Ø40 |
Ø50 |
Ø60 |
Ø70 |
Ø80 |
Ø90 |
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|
Ø100 |
Ø110 |
Ø120 |
Ø125 |
Ø130 |
Customization available upon request |
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3, Key performance differences (hardness, wear resistance, toughness)
Performance is the core basis for dividing the application scenarios of the two, and the difference is mainly reflected in the balance of "wear resistance toughness":
|
performance metrics |
High chromium steel ball | Low chromium steel ball |
Comparison Conclusion |
|
Hardness (HRC) |
≥ 58 (regular 58-62, special models can reach 63-67) |
45-55 (mostly between 48-52) |
High chromium steel balls have significantly higher hardness and stronger surface scratch resistance |
|
wear resistance |
The wear rate is extremely low (usually ≤ 0.05%/1000 hours), which is 2-3 times that of low chromium steel balls |
High wear rate (usually 0.15% -0.3%/thousand hours) |
High chromium steel balls have much higher wear resistance than low chromium steel balls, and have a longer service life) |
|
impact toughness |
Good (impact value ≥ 3.0 J/cm ²), able to withstand moderate impact loads (such as rough grinding in mines) | Poor (impact value 1.0-2.5 J/cm ²), weak impact resistance, and easy to break | Low chromium steel balls have poorer toughness and are prone to cracking and loss of roundness in high impact scenarios |
4 . Suggestions for selection
Priority selection of high chromium steel balls:
Grinding high hardness materials (such as ore, quartz sand);
Large ball mills, continuous production scenarios (high downtime costs);
Pursuing long-term cost control (willing to bear high initial investment and reduce subsequent ball filling/labor costs).
Optional low chromium steel balls:
Grinding soft materials such as limestone and coal;
Small equipment, intermittent production (low downtime cost);
Short term projects with limited budget (only pursuing low initial costs without considering long-term losses).
In summary, high chromium steel balls are a "high-performance, cost-effective" choice, suitable for industrial scenarios with high wear resistance requirements; Low chromium steel balls are a "low-cost, low performance" choice that is only suitable for low load, short-term grinding needs. There is no absolute "superiority or inferiority" between the two, but rather a difference in "adaptability".
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