Mill Grinding Balls, Grinding Cylpebs and Grinding Rods
Medium Chrome Cast Grinding Balls (Cr 8–12%)
PRODUCT PARAMETERS
Description
Medium Chrome Alloy Cast Grinding Balls offer a balance between hardness, toughness, and cost-effectiveness.
Diameter tolerance：
| Diameter (mm) | Φ<30 | 30<Φ<60 | 60<Φ<80 | 80<Φ<100 | Φ>100 |
| Diameter tolerance(mm) | +1,-1 | +1.5,-1 | +2,-1 | +2.5,-1 | +3,-1 |
Technical specification：
| Material | Diameter(mm) | Hardness(HRC) | Breakage rate | Impact value(J/cm²) | Drop times(times) | Micro structure |
| ZQCr5 | 17-150 | >47 | <1% | >2 | ≥10000 | M+C |
Chemical composition
| Material | Chemical composition(%) | ||||||||
| ZQCr5 | C | Si | Mn | Cr | Mo | Cu | Ni | P | S |
| 2.1-3.3 | 1.5max | 0.3-1.5 | 4.0-6.0 | 0-1.0 | 0-0.8 | – | ≤0.10 | ≤0.10 | |
Features:
- Material Composition – Typically contain 5-10% chromium (Cr) along with carbon (C), manganese (Mn), and other alloying elements like molybdenum (Mo) and nickel (Ni).
- Moderate Hardness – Hardness ranges from 48-58 HRC, lower than high-Cr balls but higher than low-Cr balls.
- Balanced Wear Resistance – Offers better wear resistance than low-Cr balls but slightly lower than high-Cr balls.
- Improved Toughness – Less brittle than high-Cr cast balls, reducing the risk of breakage in high-impact applications.
- Corrosion Resistance – Performs well in both wet and dry grinding conditions.
- Heat Treatment – Quenching and tempering improve wear resistance and mechanical properties.
- Applications – Used in cement plants, power stations, and mineral processing, especially in conditions that require both durability and cost efficiency.
Selection notes
Medium chrome cast balls sit between low chrome and high chrome: enough chromium for abrasive clinker, at a price that suits plants running a high ball charge.
- Sizes are supplied to the tolerance stated in the specification table above
- Hardness and impact values are recorded per heat and reported on the mill certificate
- Mixed sizes can be loaded in one container to suit a chamber change
- Packing options: 1 t bulk bag, 850 kg steel drum or 2 t pallet
Ordering
Send the mill type, chamber, ball or rod size and the tonnage you need per year. We will quote FOB Qingdao or CIF, with a lead time confirmed against the current production schedule. Request a quotation.
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FAQs
What is medium chrome used for?
Cr 8-12% with HRC 45-55, a cost-effective grade for cement raw mills and coal mills where impact is moderate and the budget sets the media choice.
What sizes are available?
20 mm to 100 mm, in 10 mm steps. Mixed sizes can be loaded in one container.
How does it compare with high chrome on cost?
Medium chrome costs less per tonne but wears faster in abrasive clinker. If your consumption is above roughly 300 g/t in a cement mill, high chrome usually wins on cost per tonne ground.
What is the MOQ and lead time?
MOQ is 20 tonnes per size for a first order; a 5 tonne trial lot is available if you need to test the media in your mill. Lead time is 20-30 days for 20-100 tonnes and 30-40 days above that, ex-works Shandong or FOB Qingdao.
Do you provide a hardness report?
Yes. Hardness is checked on every heat and reported together with impact value, breakage rate and microstructure.
