Process for the production of tubular bodies

Details Process for the production of tubular bodies Process for the production of tubular bodies

1989-08-03

1991-06-25

Yee, Deborah

Metal treatment

Compositions

Heat treating

148 12E, 148 12R, C21D 908, C21D 810

Patent

active

050264362

ABSTRACT:
In a process for the production of tubular bodies that are resistant to stress corrosion cracking, in particular non-magnetizable drill stems and rod sections of austenitic steels, after solution treatment, quenching, and after deformation at a temperature of under 500.degree. C., in order to increase the mechanical properties of the material, and after processing and incorporation of a drilling, the body is heated to a temperature of 220.degree. to 600.degree. C., at least to temperature equalization with a temperature differential of at most 10.degree. C. in the walls of the body. The body is then maintained for at most a time t in minutes at a temperature T in degrees Celsius in accordance with the expression

REFERENCES:
patent: 4472207 (1984-09-01), Kinoshita et al.
patent: 4919728 (1990-04-01), Kohl et al.

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