I was wondering if anyone could give some advice on what is the best stainless bolting material for long term subsea use in a CP environment. Basically I am required to bolt to a M20 female threaded component made from 431S29 (UNS S43100). I was thinking of using the same material but was unsure of its performance subsea. If I was to use another grade of bolt the female thread would still be 431 and I am most likely stuck with this anyway. Any advice would be much appreciated.