Cooling of hot rolled steel stock

Details Cooling of hot rolled steel stock Cooling of hot rolled steel stock

1974-10-07

1976-02-24

Stallard, W.

Metal treatment

Compositions

Heat treating

C21D 714

Patent

active

039402940

ABSTRACT:
This invention relates to a method of cooling hot rolled coiled bar in which the bar is water-cooled immediately after rolling to a temperature (t.sub.1 ') at which it is still sufficiently ductile to be readily coiled, in which it is then forced air cooled to a temperature (t.sub.1) not less than that at which transformation of the body of the bar from austenite begins, in which it is then free air cooled to a temperature (t.sub.2) not less than that at which scale transformation from wustite begins and in which the coiled bar is finally water-cooled to quench-in and suppress the transformation of the scale to magnetite.
Typical temperature ranges for mild steel, low/high carbon steels (up to 1%C), low alloy steels and semi/free-cutting steels would be

REFERENCES:
patent: 3231432 (1966-01-01), McLean et al.
patent: 3389021 (1968-06-01), Easter et al.
patent: 3645805 (1972-02-01), Hoffman et al.

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