Heat treatment process for wire rods

Details Heat treatment process for wire rods Heat treatment process for wire rods

1995-06-06

1996-11-26

Ip, Sikyin

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

148596, 148600, E21D 100, C21D 1607

Patent

active

055781500

ABSTRACT:
A conveyor moves forward an unconcentrically spiralled loose coil of steel wire rod having a temperature not lower than Ar.sub.3 into a retention bath of molten salt for heat treatment. Just before entering the retention bath, the coil is quenched by spraying a solution of molten salt kept at a temperature between 400.degree. and 600.degree. C. and not higher than the temperature of the retention bath either from above and below or from only above the coil. Then, the quenched coil is retained in the retention bath of molten salt kept at a temperature between 400.degree. and 600.degree. C., thereby causing pearlite transformation and forming a fine pearlite structure in the wire rod.

REFERENCES:
patent: 3340109 (1967-09-01), Keough
patent: 3615926 (1971-10-01), Taylor
patent: 3785878 (1974-01-01), Economopoulos
patent: 4314860 (1982-02-01), Tominaga

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