Process for the production of ferritic stainless steel sheets or

Details Process for the production of ferritic stainless steel sheets or Process for the production of ferritic stainless steel sheets or

1981-01-06

1983-02-15

Skiff, Peter K.

Metal treatment

Compositions

Heat treating

148 123, 148135, C21D 802, C21D 946

Patent

active

043739717

ABSTRACT:
In a process for the production of cold rolled ferritic stainless steel sheets or strips, a hot rolled strips has been annealed by a long time batchwise annealing and cold rolling and recrystallization annealing have been repeated usually twice. In the present invention, a hot rolled steel strip of an Al-containing ferritic stainless steel is heated by continuous annealing to a temperature of from 850.degree. to 1100.degree. C., AlN (aluminum nitride) is precipitated in the dispersed state and then cooling the strip to a temperature of 700.degree. to 900.degree. C., performing subsequent cooling to a level not higher than 200.degree. C. at such a cooling rate that a chromium depletion layer, which causes a gold dust defect, is not formed around the chromium carbonitride. Single cold rolling and recrystallization annealing are carried out in combination until the thickness is reduced to the gauge thickness.

REFERENCES:
patent: 2808353 (1957-10-01), Leffingwell et al.
patent: 3607237 (1971-09-01), Kalita
patent: 3655459 (1972-04-01), Brickner et al.
patent: 4078919 (1978-03-01), Kado et al.
Peckner et al, Handbook of Stainless Steels, "Structure and Constitution _of Wrought Ferretic Steels", McGraw-Hill Book Co., 1977, pp. 5-1 to 5-40 & 14-2.

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