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08454 Stress Relaxation Cracking Of Welded Joints In Thick Sections Of Type-347 Stabilized Grade Of Stainless Steel

This paper discusses reactors in hydrocarbon service that experienced numerous cracking problems over a 8-year period, where cracks were confined to the welded zones.  The material is  TP347 stainless steel, welded with E347-16 consumables.

Product Number: 51300-08454-SG
ISBN: 08454 2008 CP
Author: Christian E. van der Westhuizen
Publication Date: 2008
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This paper discusses reactors that experienced numerous cracking problems, over a 8-year period, where cracks are confined to the welded zones. The reactors were in hydrocarbon service. The material of construction is solid TP347 stainless steel and the original construction welds as well as initial repair welds were done with E347-16 consumables. Other factors playing a role are: more than 60 transients resulting in creep-fatigue as well as the poor creep-rupture ductility of welds. Inner surfaces are subject to coke formation and a small degree of low temperature carburization and sulfidation at temperatures in the region of 560°C. Welded joints that have cracked are where the parent material is above 12mm in thickness and where grain sizes are coarser than ASTM no 3.5. Concerns of weld quality, triaxial stress raisers, heat treatment practices, melt practices and sigma phase formation is included.

Keywords: Stress relaxation cracking, TP347 stainless steel

This paper discusses reactors that experienced numerous cracking problems, over a 8-year period, where cracks are confined to the welded zones. The reactors were in hydrocarbon service. The material of construction is solid TP347 stainless steel and the original construction welds as well as initial repair welds were done with E347-16 consumables. Other factors playing a role are: more than 60 transients resulting in creep-fatigue as well as the poor creep-rupture ductility of welds. Inner surfaces are subject to coke formation and a small degree of low temperature carburization and sulfidation at temperatures in the region of 560°C. Welded joints that have cracked are where the parent material is above 12mm in thickness and where grain sizes are coarser than ASTM no 3.5. Concerns of weld quality, triaxial stress raisers, heat treatment practices, melt practices and sigma phase formation is included.

Keywords: Stress relaxation cracking, TP347 stainless steel

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