Free machining steel with bismuth and manganese sulfide

Details Free machining steel with bismuth and manganese sulfide Free machining steel with bismuth and manganese sulfide

1979-08-29

1981-03-10

Rutledge, L. Dewayne

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75123R, 75123A, 75123F, 75123G, 75123N, 75129, 148 2, 148 12R, C22C 3860

Patent

active

042551889

ABSTRACT:
A free machining cast steel shape has in its microstructure, both bismuth-containing inclusions and manganese sulfide inclusions. The manganese sulfide inclusions act as microcrack initiators, and the bismuth-containing inclusions act as liquid metal embrittlers, propagating the microcracks. The mean size and spacing of the manganese-sulfide inclusions are controlled.

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patent: 3152889 (1964-10-01), Holowaty
patent: 3152890 (1964-10-01), Holowaty
patent: 3634074 (1972-01-01), Ito et al.
patent: 3679400 (1972-07-01), Nachtman
patent: 3705020 (1972-12-01), Nachtman
patent: 3723103 (1973-03-01), Kato et al.
patent: 3973950 (1976-08-01), Itoh et al.
patent: 4004922 (1977-01-01), Thivellier et al.
Watson et al., "Metallurgy of Free Machining Steels," BHP Tech. Bull., 21(1), May 1977, pp. 22-32.

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