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The thermal effects of annealing, sensitization and welding on the resistance to corrosion by plant process solutions were determined for nine stainless steel alloys. Field corrosion information from exposure of 1200 test coupons is recorded and correlated with the 240-hour boiling 65 percent nitric acid test. The results show (1) general corrosion and pitting as well as intergranular corrosion can be accelerated in certain solutions by improper heat treatment and welding; many solutions do not cause accelerated corrosion of improperly heat treated stainless steels; (2) the boiling 65 percent nitric acid test is a satisfactory quality test for Types 302, 304, 304L, 347, 316 and 317 stainless steels, but is not a satisfactory quality test for Types 321, 316L and 318 stainless steels; and (3) single-pass welds on 1/8-inch thick material will cause severe intergranular corrosion in only a very few instances.
Auld, J. R.
Consultant, Engineering Department E. I. du Pont de Nemours & Co., Wilmington, Delaware