Sells Scrap, Grinding Balls, Pig Iron
Buys Scrap, Grinding Balls, Pig Iron
Buys Scrap, Grinding Balls, Pig Iron
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Balls, cylpebs and shaped pieces of stainless steel used to grind, mix and polish where iron contamination or rust must be avoided — laboratory and planetary mills, food, pigment and pharmaceutical milling, and mass finishing of parts. Bulk mineral grinding uses forged steel and high-chromium cast iron instead, which are sometimes loosely called 'chrome' or 'stainless' but are not stainless steel.
Grinding media are the loose bodies that tumble inside a ball mill and break the material down by impact and attrition. For ore, cement and coal the media is consumed by the tonne and has to be cheap and hard, so it is forged or rolled carbon-manganese steel or high-chromium white cast iron (typically 11–30% Cr, covered by ASTM A532). These 'high-chrome' balls resist wear well, but they are cast iron, not stainless steel, and they do rust.
Stainless grinding media are used where the product must not pick up iron oxide or where the mill is wet and corrosive: laboratory ball mills and planetary mills for sample preparation, milling of food ingredients, pigments, inks, ceramics, battery materials and pharmaceuticals, and attritors and bead mills. Hardened martensitic 440C and 420 balls wear least; austenitic 304 and 316 are softer but more corrosion resistant and non-magnetic in the annealed state.
The same family includes burnishing and tumbling media — small stainless balls, pins, cones and ball-cones run with water and compound in vibratory or rotary barrels to deburr, polish and burnish metal parts. Stainless media do not rust in the wet barrel, last almost indefinitely and leave a bright finish on jewellery, cutlery, watch parts and machined components.
In the GCC, bulk grinding media for cement plants and mining are bought in large volumes as forged steel and high-chromium cast balls; stainless media are a small, specialist purchase by laboratories, universities, food and chemical producers and metal finishers, imported from Asia and Europe.
Order grinding media by shape, diameter (or size range), material and hardness, and quantity by weight. For laboratory mills, match the ball material to the jar material so neither contaminates the sample.
No standard covers stainless grinding media as such; they are bought on the ball grade, hardness and size. The standards below cover the cast-iron media they are compared with, and precision balls.
| Region | Standard | What it covers |
|---|---|---|
| USA | ASTM A532/A532M ASTM |
Abrasion-resistant cast irons — the high-chromium white irons used for mining grinding balls (not stainless steel) |
| China | GB/T 17445 SAC |
Cast grinding balls — high- and medium-chromium and low-chromium cast iron grinding media |
| International | ISO 3290-1 ISO |
Steel balls — accuracy grades, used where precision stainless balls serve as grinding media |
Grade equivalents and the standards bodies: Steel grades & standards
Local Steel Mills · Steel Mills - Agents & Traders · Coil Service Center · Tube Manufacturer · Stockist - Distributor · Fabrication · Other Steel Users · Design - Engineering · Surface Treatment · Equipment & Software · Transport & Warehousing · Consultants · Changzhou
Steel Mills - Agents & Traders · Stockist - Distributor · Doha
Local Steel Mills · Steel Mills - Agents & Traders · Coil Service Center · Tube Manufacturer · Stockist - Distributor · Fabrication · Other Steel Users · Design - Engineering · Surface Treatment · Equipment & Software · Transport & Warehousing · Consultants · Changzhou
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