Patent ID: 6709528
Filing Date: 2004-03-23
Classification: C21D,C22C,C23F,C23G

Abstract:
A method for enhancing the corrosion resistance of an austenitic stainless steel having the composition of UNS N08367 and a first critical crevice corrosion temperature that is no more than 5Â° C. greater than x, where x is based on the composition of the steel and x(Â° C.)=3.2 (weight % Cr)+7.6 (weight % Mo)+10.5 (weight % N)âˆ’88.5, the method comprising pickling at least a portion of a surface of the steel by an acid pickling, wherein sufficient material is removed from the portion of the surface of the steel during pickling such that after pickling the pickled portion of the surface has a second critical crevice corrosion temperature that is at least 16Â° C. greater than x.