Repair of a 2{1/4}Cr-1Mo petrochemical reactor
This paper describes the evaluation of materials properties, planning, and the repair of cracks in the bottom head of a normalized and tempered 2{1/4}Cr-1Mo steel reactor R-530. The nondestructive examination during the January 1993 shutdown revealed that cracking had occurred around both sides of the weld buildup under the catalyst support cone and extended into the 2{1/4}Cr-1Mo base metal. A significant part of this effort involved metallurgical evaluation of the base metal to determine whether sufficient PWHT time was available for stress relieving the bottom head after the repairs. The temper-embrittled 2{1/4}Cr-1Mo base metal and sigmatized stainless weld overlay required the use of controlled deposition weld repair techniques to avoid cracking during the repair welding and subsequent stress relieving. This paper describes the repair procedures, preheat and postweld heat treatments of the bottom head, nondestructive examination, engineering evaluation, and documentation used to achieve a satisfactory repair.
- OSTI ID:
- 471168
- Journal Information:
- Bulletin - Welding Research Council, Journal Name: Bulletin - Welding Research Council Journal Issue: 412; ISSN 0043-2326; ISSN WRCBA2
- Country of Publication:
- United States
- Language:
- English
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