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

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Title: Grinding members

Abstract: Heat-treated cast grinding members such as grinding balls and lining plates for use in a grinding mill, which members are subjected to abrasion and repeated impacts are disclosed. The members have a composition of chromium and carbon within the quadrilateral diagram seen in FIG. 1 and have been subjected to a hardening heat-treatment from 950.degree. to 1100.degree. C and a tempering heat-treatment from 440.degree. to 530.degree. C. The members evidence the metallographic structure constituted by eutectic carbides and a matrix which matrix is free of pearlite and includes a martensitic solid solution containing less than 3% of residual austenite, and pro-eutectoidic carbides, the members having a Rockwell "C" of at least 59.

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Inventors: Joiret, Victor L. J.

Application Number: 665292
Filing Date: 1976-03-09
Publication_date: 1977-08-23
Assignee:
Primary Class(es): 148/324
Other Classes:
US Patent Ref:

1245552	Nov, 1917	Becket	75/126.
2201425	May, 1940	Berglund	75/126.
2773761	Dec, 1956	Fugua et al.	75/126.
2934430	Apr, 1960	Klaybor et al.	75/126.
3334996	Aug, 1967	Foster et al.	148/35.
3410682	Nov, 1968	Avery et al.	75/128.
3690957	Sep, 1972	Thompson	148/35.
3692515	Sep, 1972	Fletcher et al.	75/126.

Other Refs: 693,6696,800,375438,179

Feb, 1967	BE
Jul, 1968	NL
Nov, 1935	UK

Other References: Transactions of ASM, June 1935, pp. 469-494.
Alloys of Fe and Cr; vol. II, Kinzel et al., 1940, pp. 157-165, 182, 183, 189, 190-195.
Norman et al., "Martensitic White Cast Irons for Abrasion-Resistant Castings," Trans Amer. Foundrymen's Soc., vol. 67, 1959 pp. 242 & 246-256.