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2000 №03 (12) 2000 №03 (01)

The Paton Welding Journal 2000 №03


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.

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.