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US 12,655,493 B2Granted
Forged grinding balls for semi-autogenous grinder
AssigneeMagotteaux International S.A.
InventorsMarc Babineau, Michel Bonnevie
Life of this patent
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Abstract
An improved grinding ball may include a carbon content of 1.1 to 1.4 wt %, a chromium content of 10 to 14 wt %, a manganese content of 0.8 to 1.5 wt %, a silicon content of 0.6 to 1 wt %, a molybdenum content of less than 1 wt %, a nickel content of less than 1 wt %, any impurities with a total content of less than 0.5 wt %, the balance to obtain 100% being iron. The grinding ball includes a discrete distribution of chromium carbides as opposed to a network distribution.
Claims9
A grinding ball, wherein the grinding ball prior to use comprises, by weight:
- a carbon content comprised between 1.1 and 1.4%,
- a chromium content comprised between 10 and 14%,
- a manganese content comprised between 0.8 and 1.5%,
- a silicon content comprised between 0.6 and 1%,
- a molybdenum content of less than 1%,
- a nickel content of less than 1%,
- manufacturing impurities with a total content of less than 0.5%,
- the balance to obtain 100% being iron,
- wherein the grinding ball comprises a discrete distribution of chromium carbides, and wherein the grinding ball has a microstructure comprising a martensite percentage greater than 50% by volume, a residual austenite percentage between 7 and 25% by volume, a total percentage of perlite and bainite between 2 and 10% by volume, and a chromium carbide percentage of greater than 0% and less than or equal to 22% by volume.
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Dependencies are inferred from the claim text.