Method and apparatus for direct heat treatment of medium- to hig

Details Method and apparatus for direct heat treatment of medium- to hig Method and apparatus for direct heat treatment of medium- to hig

1984-05-24

1985-07-02

Skiff, Peter K.

Metal treatment

Compositions

Heat treating

148156, 266106, 266131, C21D 808, C21D 164

Patent

active

045266271

ABSTRACT:
A method and apparatus for the direct heat treatment of medium- to high-carbon steel rods which provides an increased tensile strength and drawability by subjecting hot-rolled steel rods to controlled cooling with a coolant. Expanded spiral coils of hot-rolled medium- to high-carbon steel rod having an austenitic structure and which is continuously transported in a generally horizontal direction is cooled by passing the spiral coils through a vessel containing a coolant of a gas bubble-water mixed fluid under a strong turbulent action. The coolant fluid contains a uniform dispersion of oxidizing gas bubbles and is maintained at a temperature of not higher than 95.degree. C. Preferably, the coolant is caused to flow in the same direction as the direction of movement of the coil in the vessel. The surface of the rod may be oxidized by allowing it to cool in air before it is immersed in the coolant fluid.

REFERENCES:
patent: 3494603 (1970-02-01), Hill
patent: 3718024 (1973-02-01), Vitelli
patent: 3788618 (1974-01-01), Van der Bulcke
patent: 4150816 (1979-04-01), Properzi
patent: 4170494 (1979-10-01), Fujii et al.
patent: 4313898 (1982-02-01), Schurch
patent: 4395022 (1983-07-01), Paulus et al.
patent: 4415143 (1983-11-01), Ebata

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