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

C - Chemistry, Metallurgy

22

C

148/10, 75/150

C22C 38/02 (2006.01) B22D 7/00 (2006.01) C21D 7/13 (2006.01) C22C 38/60 (2006.01)

Patent

CA 1139969

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 convectional in leaded, free machining steels. The billet was hot deformed at a temperature above about 920°C (1700°F) and below 1150°C (2100°F). The steel contains inclusions of MnTe and Bi2Te3 as well as elemental Bi.

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