Semi-finished steel article and method for producing same

Details Semi-finished steel article and method for producing same Semi-finished steel article and method for producing same

1979-01-24

1980-12-02

Rutledge, L. Dewayne

Metal treatment

Compositions

Heat treating

75123AA, 75123F, 148 12F, C22C 3860

Patent

active

042369398

ABSTRACT:
A steel billet is produced having free machining properties and substantially devoid of surface-cracking in the as-deformed condition and without surface conditioning. The steel contains bismuth and tellurium and may contain lead but in a smaller amount than is conventional in leaded, free machining steels. The billet was hot deformed at a temperature above about 920.degree. C. (1700.degree. F.) and below 1150.degree. C. (2100.degree. F.). The steel contains inclusions of MnTe and Bi.sub.2 Te.sub.3 as well as elemental Bi.

REFERENCES:
patent: 3679400 (1972-07-01), Nachtman
patent: 3723103 (1973-03-01), Kato et al.
patent: 3973950 (1976-08-01), Itoh et al.
patent: 3981752 (1976-09-01), Kranenberg et al.
patent: 4004922 (1977-01-01), Thivellier et al.
patent: 4060428 (1977-11-01), Wilson et al.

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