Semi-finished steel article

Details Semi-finished steel article Semi-finished steel article

1981-06-08

1982-06-08

Skiff, Peter K.

Metal treatment

Compositions

Heat treating

C22C 3800

Patent

active

043337767

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: 2378548 (1945-06-01), Gregg et al.
patent: 3152889 (1964-10-01), Holowaty
patent: 3365922 (1968-01-01), Conces et al.
patent: 3723103 (1973-03-01), Kato et al.
patent: 3973950 (1976-08-01), Itoh et al.
patent: 4004922 (1977-01-01), Thivellier et al.
patent: 4032333 (1977-06-01), Josefsson
patent: 4279646 (1981-07-01), Kato et al.

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