Type 329 stainless steel, previously found to have a corrosion resistance markedly greater than that of Types 316, 304L and 309SCb in the condensing vapors from solutions of 7.5N HNO3 and 0.2N HCl, has been found resistant in similar solutions with Cl− contents up to 0.38N. Welded specimens of Type 329 must be fully annealed to prevent severe intergranular attack in the heat-affected zone when immersed in boiling solutions of the above-mentioned compositions. The mechanism of the attack and the influence of accumulated chromic and ferric ions are discussed. The behavior of severely stressed specimens of this steel in these solutions was also investigated and compared with that of Type 316 specimens.

Subject
Weld attack, Steel surfaces, Corrosion rate, Welding, Magnification, Vapors, Condensers, Immersion, Corrosion resistance, Stainless steel, Chlorides, Pickling solutions, Heat affected zone
© 1963 National Association of Corrosion Engineers
1963
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