Steel for cold forging and method of making

Details Steel for cold forging and method of making Steel for cold forging and method of making

1984-10-19

1987-01-06

Stallard, Wayland

Alloys or metallic compositions

Ferrous

Vanadium, tantalum or niobium containing

148 121, 148319, C21D 714

Patent

active

046345736

ABSTRACT:
An improved steel for cold forging for machine structural use, particularly, case hardening steel, contents of Al, N and Nb are selected to satisfy a specific corelation therebetween, and the amounts of O and S are controlled. The steel is resistant to cracking at the cold forging, and growth of austenite crystals to coarse grains during carburizing or carbonitriding is prevented.
Disclosed are preferable structure of the steel and rolling conditions to obtain the structure, and conditions for continuous casting of the steel.

REFERENCES:
patent: 3897279 (1975-07-01), Shaughnessy et al.
patent: 3997372 (1976-12-01), Matas et al.
patent: 4137104 (1979-01-01), Nashiwa et al.
patent: 4332630 (1982-06-01), Economopolous et al.
patent: 4375378 (1983-03-01), Ohtani et al.

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