C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
148/48
C21D 1/62 (2006.01) B21B 45/02 (2006.01) C21D 1/84 (2006.01)
Patent
CA 1038269
ABSTRACT OF THE DISCLOSURE: 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 (t1'), typically 830°C - 900°C, at which it is still sufficiently ductile to be readily coiled, in which it is then forced air cooled to a temperature (t1), typically 700°C - 750°C, not less than that at which transforma- tion of the body of the bar from austenite begins, in which it is then free air cooled to a temperature (t2), typically 480°C - 500°C, 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. Bar treated in accordance with this invention has a considerably reduced scale thickness, it tends to be more uniformly disposed and it is much easier to remove than hitherto.
211207
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