Alloys or metallic compositions – Ferrous – 1.7 percent or more carbon containing
Patent
1986-05-21
1987-08-11
Rosenberg, Peter D.
Alloys or metallic compositions
Ferrous
1.7 percent or more carbon containing
420 41, C22C 3300
Patent
active
046860819
ABSTRACT:
A method of adding a low-melting point metal (e.g. Pb or Bi) to liquid steel for producing a free-cutting steel in a consistent manner and in high yield of addition is disclosed. In accordance with the method, at least one member selected from said low-melting point metal and an oxide thereof, and at least one member selected from the group consisting of quick lime and a carbonaceous material are mixed in specified optimum proportions and the mixture is blown into the liquid steel through an injection lance. The liquid steel may be agitated while the mixture is added, and the appropriate conditions for the agitation of the steel are also specified.
REFERENCES:
patent: 3998625 (1976-12-01), Koros
patent: 4435210 (1984-03-01), Hirokawa
patent: 4462823 (1984-07-01), Fontaine
Journal of The Iron and Steel Institute of Japan, vol. 68, No. 4, Mar. 1982.
Ishii Hiromi
Kinoshita Kazuhiro
Masumitsu Noriyuki
Suzuki Isao
Takashima Kiyoshi
Nippon Steel Corporation
Rosenberg Peter D.
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