The Paton Welding Journal, 2000, №03

2000 №03 (12)

2000 №03 (01)

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The Paton Welding Journal, 2000, #3, 54-56 pages

Mode of fracture of welded joints of heat-resistant steel in gas medium of ammonia synthesis

V.A. Borisenko¹, Yu.Ya. Nikhaenko¹, A.N. Kusyukov¹, A.V. Tugolukov², S.V. Panchenko²

¹NIIKHIMMASH, Severodvinsk, Russia
²JSC Concern Stirol, Gorlovka, Ukraine

Abstract
The mode of fracture of welded joints in heat-resistant steel 18Kh3M under conditions of synthesis of ammonia is considered. It has been established that the main cause of fracture is a combined unfavourable effect of postweld heat treatment of welded joints and creep process. The cold cracks are initiated in the higher-hardness quenching structures and contribute to the initiation of creep microfractures. Atomic hydrogen formed under a pressure of 32 MPa and 340 C temperature causes the accelerated propagation of cracks until they penetrate through a parent metal.
Keywords: electric arc welding, heat-resistant steels, pipelines, site welds, cracks

References

1. 1974) Technology of electric welding of metals and alloys. Edited by B.E. Paton. Moscow: Mashinostroyeniye.
2. Archakov, Yu.I. (1985) Hydrogen corrosion of steel. Moscow: Metallurgia.

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Suggested Citation

V.A. Borisenko, Yu.Ya. Nikhaenko, A.N. Kusyukov, A.V. Tugolukov, S.V. Panchenko (2000) Mode of fracture of welded joints of heat-resistant steel in gas medium of ammonia synthesis. The Paton Welding J., 03, 54-56.

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