Welding UNS S31603 and NACE MR0175, welds need to be solution annealed and quenched again?
NACE MR0175/ISO15156 Table A.2 footnote (b) states that UNS S31603 shall be in the solution-annealed and quenched condition.
Question: Do welds need to be solution annealed after welding if the base metals were all solution annealed and the filler metal is of an ER/E316L type?
The operating condition is around 1000 psig at 80F. The H2S partial pressure is 40 psi, chloride content around 2000 ppm, pH around 4.85.
Question 1: Regarding UNS S31603 and 15156-3 Table A.2 Footnote (b), this footnote states that the UNS S31603 shall be in the solution annealed and quenched condition. Do welds need to solution anneal after welding if the base metals were all solution annealed and the filler metal is of the E/ER316L type? The operating condition is 1000 psig at 80F with 40 psi partial pressure H2S, 2000 ppm chloride and pH about 4.5.
The 15156-3 Table A.2 does not specifically address the requirements for weldments. Note Clause 18.104.22.168 that states that “the metallurgical changes that occur when welding CRAs and other alloys can affect their susceptibility to SSC, SCC and/or GHSC. Welded joints can have greater susceptibility to cracking than the parent material(s) joined.” The required documented evidence for welding PQRs is defined in Clause 6.2.2 sub-clauses. You may want to employ a consultant to assist you with your application.
Reference MP Inquiry 2017-05 NACE MR0175 Part 3 A.2