Products

Rolled Steel Balls

The major advantage of precision ball rolling, compared with traditional forging methods, is the uninterrupted grain flow. Grinding balls are rolled from selected carbon and alloy steels, produced to a customer’s precise specifications.

A special feature of The Steel Ball Company’s manufacturing process is the computerised quench facility, giving uniform surface hardness and controlled cross-sectional hardness essential for very even wear.

Specifications:

  • Rolled direct from round bar, followed by in-line heat treatment and uniform quenching, tailored to give even hardness throughout.
  • Hardness: ranging up to and including 739 Brinell.
  • Ball sizes: 10 diameters available, from 16 mm to 70 mm.
  • Other sizes may be available on request, subject to volume and lead time.
Nominal ball dia. mm Approx. mass per ball g Approx. surface area mm² Average number of balls/m³ Average number of balls/t (1000 kg)
16 17 805 274999 59374
20 33 1257 140795 30400
22 44 1521 105782 22840
25 64 1964 72087 15565
30 111 2829 41717 9007
40 263 5029 17599 3800
50 514 7857 9011 1946
60 888 11314 5215 1126
65 1129 13279 4101 886
70 1410 15400 3284 709

Forged Steel Balls

The Steel Ball Company’s forged steel balls are essentially for semi-autogenous and primary milling, where balls over 70 mm diameter are required for impact grinding.

Specifications:

  • Hammer forged from selected carbon and alloy steels.
  • Hardness: maximum 500 Brinell.
  • Ball sizes: 6 diameters available, from 75 mm to 150 mm.
  • Other sizes may be available on request.
Nominal ball dia. mm Approx. mass per ball g Approx. surface area mm² Average number of balls/m³ Average number of balls/t (1000 kg)
75 1735 17679 2670 576
80 2105 20114 2200 475
90 2998 25457 1545 334
100 4112 31429 1126 243
120 7105 45257 652 141
150 13878 70714 334 72