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US 5,855,701 AGranted
Method of manufacture high carbon content steel
AssigneesMagotteaux International S.A., Amic Industries Limited, Scaw Metals Division
InventorMichel Bonnevie
Life of this patent
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Abstract
Alloyed steel with high carbon content having a composition, expressed in percentage weight: carbon from 1.1 to 2.0%, manganese from 0.5 to 3.5%, chromium from 1.0 to 4.0%, silicon from 0.6 to 1.2%, the remainder being iron with the usual impurity content, such that it provides a metallographic structure mainly of non-equilibrium fine pearlite and that its hardness is between 47 Rc and 54 Rc.
Claims5
Process for the production of grinding media, made of alloyed steel of the composition, (expressed in percentage weight):
- ______________________________________ carbon from 1.1 to 2.0% manganese from 0.5 to 3.5% chromium from 1.0 to 4.0% silicon from 0.6 to 1.2% ______________________________________
- the remainder being iron with the usual impurity content, wherein after casting, they are subjected to a stage consisting of cooling from a temperature above 900.degree. C. to a temperature of above 500.degree. C. at a cooling rate of between 0.30 and 1.90.degree. C./s, to provide a metallographic structure mainly of non-equilibrium fine pearlite and having a hardness between 47 Rc and 54 Rc.
Dependencies are inferred from the claim text.