Hot strips or heavy plates from a denitrated steel and method fo

Details Hot strips or heavy plates from a denitrated steel and method fo Hot strips or heavy plates from a denitrated steel and method fo

1980-12-03

1983-08-09

Skiff, Peter K.

Metal treatment

Compositions

Heat treating

148 124, 148 36, C21D 802

Patent

active

043976972

ABSTRACT:
An improved method for the manufacture of hot strips or heavy plates from a denitrated steel composed of 0.04 to 0.16% carbon, 1.25 to 1.90% manganese, 0.2 to 0.55% silicon, 0.004 to 0.020% phosphorus, 0.002 to 0.015% sulfur, 0.02 to 0.08% aluminum, 0.02 to 0.08% niobium, the remainder iron and possibly contaminants, including the steps of having the hot strips or plates leaving the last finishing stand of rolls at a temperature of 750.degree. C. to 820.degree. C., cooling the hot strips or plates to an intermediates temperature of 450.degree. C. to 500.degree. C. at a cooling rate of 2.degree. to 10.degree. C./s and then slowly cooling the hot strips or plates in air to room temperature in a coil or in a pile.

REFERENCES:
patent: 3704180 (1972-11-01), Heitmann et al.
patent: 3849209 (1974-11-01), Ishizaki et al.
patent: 3918999 (1975-11-01), Sekine et al.
patent: 3976514 (1976-08-01), Matsukura et al.
patent: 4137104 (1979-01-01), Nashiwa et al.
patent: 4184898 (1980-01-01), Ouchi et al.
patent: 4219371 (1980-08-01), Nakasugi et al.

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