Shougang Steel Balls – Manufacturer and Partner of Grinding Media!
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Shougang Metallurgical Building Materials Co., Ltd., Fengrun District, Tangshan City
Address: Baiguantun Economic Development Zone, Fengrun District, Tangshan City, Hebei Province
Website: www.sgsteelball.cn
Website: www.sgsteelball.com
Medium-chromium cast ball MCCB (Cr: 4%–9%)
1. Chemical Composition: Steel ball diameters range from Φ8 mm to Φ150 mm. Designation, grade, and chemical composition are as follows: | Steel Ball Type | Grade | Chemical Composition (wt%) | |-----------------|-------|---------------------------| | Medium-Chromium Cast Steel Balls (MCCB) | ZQCR42.1–3.3 | C: ≤2.20, Si: 0.3–1.5, Mn: 4–5, Cr: ≤0.10, P: ≤0.10, S: trace, Mo: trace, Ni: trace, Cu: trace | | ZQCR55–6 | ZQCR66–7 | ZQCR77–8 | ≤0.08 | ≤0.06 | | ZQCR88–9 | ZQCR99–10 | 2. Hardness, Impact Toughness, and Microstructure: | Designation | Surface Hardness (HRC) | Core Hardness (HRC) | Impact Value (Ak: J/cm²) | |-------------|----------------------|--------------------|-------------------------------| | ZQCR42.1–3.3 | — | — | — | | ZQCR55–6 | — | — | — | | ZQCR66–7 | — | — | — | | ZQCR77–8 | — | — | — | | ZQCR88–9 | — | — | — | | ZQCR99–10 | — | — | — |
Keywords:
Medium-chromium cast ball MCCB (Cr: 4%–9%)
Category:
Product Description
1. Chemical Composition
|
Steel ball model |
Φ8 mm ~ Φ150 mm |
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|
Name |
Grade |
Chemical composition |
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|
C |
Yes |
Mn |
Cr |
P |
S |
Mo |
Ni |
Cu |
||
|
Medium-chromium cast steel balls |
ZQCR4 |
2.1-3.3 |
≤2.20 |
0.3~1.50 |
4~5 |
≤0.10 |
≤0.10 |
Trace amounts |
Trace amounts |
Trace amounts |
|
ZQCR5 |
5~6 |
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|
ZQCR6 |
6~7 |
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|
ZQCR7 |
7~8 |
≤0.08 |
≤0.06 |
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|
ZQCR8 |
8~9 |
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|
ZQCR9 |
9~10 |
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2. Hardness, impact toughness, and microstructure
|
Name |
Grade |
Surface hardness |
Volumetric Hardness (HRC) |
Impact value |
Microstructure |
Drop-ball impact fatigue life |
|
|
Medium-chromium grinding |
ZQCR4-ZQCR6 |
47-52 |
46-51 |
≥2.5 |
B+C |
80≤Φ≤150 |
8000 |
|
ZQCR7-ZQCR9 |
48-53 |
48-52 |
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|
B—Bainite, C—Carbide |
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