Metal treatment – Compositions – Heat treating
Patent
1976-03-09
1977-08-23
Steiner, Arthur J.
Metal treatment
Compositions
Heat treating
148134, 148138, 148141, C22C 3706, C21D 500
Patent
active
040438422
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.
REFERENCES:
patent: 1245552 (1917-11-01), Becket
patent: 2201425 (1940-05-01), Berglund
patent: 2773761 (1956-12-01), Fugua et al.
patent: 2934430 (1960-04-01), Klaybor et al.
patent: 3334996 (1967-08-01), Foster et al.
patent: 3410682 (1968-11-01), Avery et al.
patent: 3690957 (1972-09-01), Thompson
patent: 3692515 (1972-09-01), Fletcher et al.
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.
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