Method of making a steel wire adapted for cold drawing

Details Method of making a steel wire adapted for cold drawing Method of making a steel wire adapted for cold drawing

1977-09-01

1979-12-25

Stallard, W.

Metal treatment

Compositions

Heat treating

148 12B, C21D 952

Patent

active

041804180

ABSTRACT:
A steel wire after coming from the mill is brought to a temperature between 850.degree. and 910.degree. C. This is followed by multi-stage water-cooling of the wire in such a manner that the surface of the wire is cooled to below the martensite start temperature while austenite is retained in the core of the wire. The heat retained in the core of the wire serves to partially temper the martensite formed at the surface of the wire. The wire is coiled while the temperature remains substantially constant so that the retained austenite in the core of the wire undergoes an isothermal transformation to fine pearlite. The heat of transformation serves to complete tempering of the martensite. After coiling, the wire is air-cooled to room temperature. The final wire exhibits a structure consisting of an outer layer of tempered martensite and a core of fine pearlite. This structure imparts excellent cold-working characteristics to the wire.

REFERENCES:
patent: 3756870 (1973-09-01), Kasper et al.
patent: 4016009 (1977-04-01), Economopoulos et al.
patent: 4016015 (1977-04-01), Respen et al.
patent: 4042423 (1977-08-01), Van den Sype

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