Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Patent
1991-06-12
1992-06-16
Dean, R.
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
148334, C21D 800
Patent
active
051221985
ABSTRACT:
A method of improving the resistance to H-induced stress-corrosion cracking of articles of low- to medium-alloy structural steels which come into contact with aqueous H.sub.2 S-containing fluids and which are manufactured by one of (i) hot rolling, with or without subsequent heat treatment, (ii) by TM-rolling, with or without accelerated cooling, and (iii) by cold rolling with subsequent heat treatment and which are then cold strained from 0% to less than 2%. In order to economically increase the resistance of articles of structural steel to H-induced stress-corrosion cracking, the articles are subjected to a final annealing for a period of at least two seconds at a temperature which is at least 540.degree. C. and the upper limit of which is as follows: In the case of hot rolled or TM-rolled or normalized articles, 30K below A.sub.C1 ; in the case of hardened and tempered articles, 30K below the tempering temperature last employed.
REFERENCES:
patent: 3830669 (1974-08-01), Matsuoka et al.
patent: 3947293 (1976-03-01), Takechi et al.
patent: 4105474 (1978-08-01), Nakasugi et al.
Heinz Gerd
Popperling Rolf K.
Schlerkmann Hubertus
von Hagen Ingo
Dean R.
Ip Sikyin
Mannesmann Aktiengesellschaft
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