Automatic Welding, 2016, №03



2016 №03 (05)

DOI of Article 10.15407/as2016.03.06

2016 №03 (07)

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Avtomaticheskaya Svarka (Automatic Welding), #3, 2016, pp. 44-48
 

Extension of service life of welded tanks of stainless steel by increasing pitting resistance

V.M. Kulik, S.A. Osadchuk, L.I. Nyrkova, V.P. Elagin And S.L. Melnichuk

E.O. Paton Electric Welding Institute, NASU. 11 Kazimir Malevich Str., 03680, Kiev, Ukraine. E-mail: office@paton.kiev.ua
 
Abstract
During long service of the tanks, manufactured of stainless steel, the pits are formed on the surface contacting with periodically preheated aggressive liquid, mainly in welded joints, and the danger of through fracture of wall arises. The aim of the work was to increase the reliability and longevity of tanks for storage of aggressive liquid, first of all, by increasing the resistance of welded joints against pitting formation. The specimens, being untreated and mechanically treated in different ways with penetration of the untreated surface and polished sheet steel 12Kh18N10T were subjected to accelerated tests for resistance against pitting corrosion at room temperature and preheatings of FeCl₃ solution similar to the technological ones. The resistance against pitting corrosion of welded joints is significantly increased after abrasive treatments, surface peening to a lesser extent and is independent of the surface roughness. The pitting resistance is also increased by replacing the indirect preheating of solution through the specimen to its direct preheating by the immersed heater. The results of the work are advisable for using in manufacture, repair and service of chemical, petrochemical, food and other equipment. 9 Ref., 2 Tables, 5 Figures.
 
Keywords: tank, stainless steel, welded joint, pitting corrosion, abrasive treatment, peening, preheating, surface roughness
 
Received:                02.02.16
Published:               28.04.16
 
 
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