Mill Grinding Balls, Grinding Cylpebs and Grinding Rods
Low Chrome Cast Grinding Balls (Cr 1–3%)
PRODUCT PARAMETERS
Description
Low chromium cast grinding balls are a type of grinding media with a relatively low chromium content, typically ranging from 1%-3%. These balls are widely used in cement plants, mining, power stations, and chemical industries for grinding applications in ball mills and vertical mills.
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 |
| ZQCr2 | 17-150 | >45 | <1% | >1.5 | ≥8000 | P+C |
Chemical composition
| Brand | Chemical composition(%) | ||||||||
| ZQCr2 | C | Si | Mn | Cr | Mo | Cu | Ni | P | S |
| 2.1-3.6 | 1.5max | 0.3-1.5 | 1.0-3.0 | 0-1.0 | 0-0.8 | – | ≤0.10 | ≤0.10 | |
Key Characteristics
Moderate Hardness: Typically HRC 45-55, providing a balance between wear resistance and impact toughness.
High Impact Toughness: Due to the low chromium content, these balls exhibit better toughness, making them suitable for high-impact conditions.
Average Wear Resistance: Compared to medium chromium (Cr 5%-10%) and high chromium (Cr >10%) grinding balls, low chromium balls have lower wear resistance but are more cost-effective.
Cost-Effective: Suitable for applications where grinding media lifespan is not the primary concern but cost control is important.
- Manufacturing Process
Low chromium cast grinding balls are produced using a casting process, which includes the following key steps:
Melting: Raw materials are melted in furnaces.
Casting: The molten metal is poured into molds to form balls of the desired size.
Cooling & Heat Treatment: Balls undergo quenching and tempering processes to enhance hardness and toughness.
- Applications
Ideal for low-impact grinding conditions where high wear resistance is not the primary requirement.
Used in cement plants, ore grinding, coal grinding, and chemical processing.
Suitable for both wet grinding and dry grinding, although low chromium balls may be more susceptible to corrosion in wet environments.
- Industry Standards
Low chromium cast grinding balls are manufactured in accordance with various industry standards:
China Standard: GB/T 17445-2009 (Cast Grinding Balls)
International Standard: ISO 3290 (General standard for steel balls, used for reference)
Selection notes
Low chrome cast balls are used where the grinding is dry and the impact is moderate – typically coal mills and raw mills where the budget sets the media choice.
- 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
When should I use low chrome cast balls?
Cr 1-3% with HRC 40-50 for dry grinding of coal and raw meal, where abrasion is moderate and the lowest cost per tonne is the priority.
What sizes do you supply?
20 mm to 100 mm. Smaller sizes (20-40 mm) are the usual choice for coal mills and second-chamber top-ups.
What is the wear life compared with forged balls?
Low chrome is softer than forged B2/B3, so it wears faster in abrasive duty. It is chosen for cost, not for longest life.
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.
How is it packed?
1 t bulk bags or 850 kg steel drums. Small sizes can be supplied in 25 kg sacks inside a big bag on request.
