Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1989-01-23
1991-01-08
Yee, Deborah
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148156, 266103, 266111, 266110, C21D 9573, C21D 963, C21D 1613
Patent
active
049832271
ABSTRACT:
Carbon steel wire, which has been maintained at a temperature above the Ac3 ransformation temperature, is heat-treated to obtain a fine pearlitic structure by passing it through a tube containing a gas practically without forced ventilation and surrounded by a heat-exchange fluid. Certain relationships between the diameter of the wire, the diameter of the tube and the conductivity of the gas are to be satisfied to ensure cooling of the wire to a temperature below the Acl transformation temperature in a time prior to the time of the pearlitic nose and to effect pearlitization to completion under a nearly isothermal state.
REFERENCES:
patent: 4581512 (1986-04-01), McGinn et al.
patent: 4786338 (1988-11-01), Anzawa et al.
patent: 4830684 (1989-05-01), Reiniche
Reiniche Andre
Sauvage Philippe
Compagnie Generale des Etablissements Michelin--Michelin & Cie
Yee Deborah
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