Rolled steel rod or bar

Details Rolled steel rod or bar Rolled steel rod or bar

1975-09-26

1977-04-05

Steiner, Arthur J.

Metal treatment

Compositions

Heat treating

148 124, 148144, 148145, 148156, 148157, C22C 3500

Patent

active

040160157

ABSTRACT:
Steel rod or bar at the exit of the finishing stand of a hot rolling mill is superficially quenched, so that the surface layer of the rod or bar is given a bainitic or martensitic structure. Immediately after quenching, the core of the rod or bar is at about 850.degree. C and, therefore, still austenitic. Subsequent air cooling allows the austenite to transform to ferrite and carbides, while the surface layer is tempered by the heat transferred to it from the core.

REFERENCES:
patent: 2753260 (1956-07-01), Payson
patent: 3345220 (1967-10-01), Haynes
patent: 3489620 (1970-01-01), Current

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