Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1980-05-14
1984-02-28
Sheehan, John P.
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
75123F, 75123G, 75123N, 75126B, 75126L, 75126M, 75128A, 75128C, 75128E, C22C 3300
Patent
active
044340060
ABSTRACT:
Mechanical anisotropy of a free cutting steel having excellent machinability can be effectively decreased by controlling inclusions so that the steel may contain inclusion A which softens at a temperature below 1000.degree. C. and inclusion B which has a melting point above 1300.degree. C. but exhibits plasticity at a temperature between 900.degree. and 1300.degree. C., that the inclusion A and the inclusion B may exist in a mutually adhered form, and that the areal percentage of the inclusion A may be at least 1% of areal percentage of the inclusion B.
Typical compositions of the inclusion A are: Pb, Bi, MnS--MnTe, SiO.sub.2 --K.sub.2 O, SiO.sub.2 --Na.sub.2 O, SiO.sub.2 --K.sub.2 O--Al.sub.2 O.sub.3, SiO.sub.2 --Na.sub.2 O--Al.sub.2 O.sub.3 and SiO.sub.2 --Na.sub.2 O--CaO--MnO; and typical compositions of the inclusion B are: MnS, MnSe and Mn(S,Se).
REFERENCES:
patent: 2182759 (1939-12-01), Harder
patent: 2215734 (1940-09-01), Harder
patent: 3634074 (1972-01-01), Ito et al.
patent: 3811875 (1974-05-01), Goda et al.
patent: 3846189 (1974-11-01), Tipnis
patent: 4115111 (1978-09-01), Itoh et al.
patent: 4210444 (1980-07-01), Bellot
patent: 4255188 (1981-03-01), Riekels
patent: 4279646 (1981-07-01), Kato et al.
Abeyama Shozo
Kato Tetsuo
Kimura Atsuyoshi
Nakamura Sadayuki
Sekiya Shigenobu
Daido Tokushuko Kabushiki Kaisha
Sheehan John P.
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