Title: Heat-treated cast grinding members

Abstract: Heat-treated cast grinding members for use in a grinding mills such as grinding balls, lining plates, crushing jaws, etc. are disclosed, which members are subjected to abrasion and repeated impact in the presence of a wet corrosive medium. These members consist essentially of 0.5 to 2.8% carbon, 15 to 35% chromium, and must satisfy the relationship percent Cr -- 8 .times. %C = 11 to 16%. These members are hardened without subsequent tempering from a temperature range of 1075.degree. to 1175.degree. C and evidence a metallographic structure of primary chromium carbides in a ferrite-free matrix which is a predominantly martensitic solid solution consisting essentially of from 0.3% to 0.45% of carbon and from 14% to 18% of chromium. The elements have a Rockwell "C" hardness of at least 60.

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Inventors: Feltz, Michel J.

Application Number: 688004
Filing Date: 1976-05-19
Publication_date: 1977-08-23
Assignee:
Primary Class(es): 148/324 148/325, 148/506, 148/578, 148/605, 148/612
Other Classes:
US Patent Ref:

1245552	Nov, 1917	Becket	75/126.
2201425	May, 1940	Berglund	45/125.
3334996	Aug, 1967	Foster	75/126.
3410682	Nov, 1968	Avery et al.	148/35.
3690957	Sep, 1972	Thompson	148/35.

Other Refs: 732,336438,179

Oct, 1969	BE
Nov, 1935	UK

Primary Examiner: Steiner, Arthur J.
Assistant Examiner:
Attorney: Holman & Stern