Effects of Heat Treatment on Corrosion Attack of Stainless Steel (SEC 15) Weld Parts

Abstract

The relation between corrosion attack in boiling Strauss' solution and heat treatment of stainless steel (SEC 15) parts was investigated. The results obtained are as follows.
(1) In the corrosion tests, having no change of dimension but indicating the differential effect of corrosion due to heat treatment, Strauss' solution as corrosive is superior to HNO3.
(2) Though it is the most desirable for corrosion resistivity that solution treatment above 1, 000°C is designed after welding, as-welded or stress relieved condition below 500°C is tolerable, and weldment shall not be treated at temperatures from 600°C to 900°C.
(3) In corrosion test by Strauss' solution the line of fusion is more corroded than the heat affected zone, and the welded specimen treated at 700°C is attacked most severely.