Effect of semi-finished products on the corrosion resistance of high-alloyed Ni-Cr-Mo materials

The corrosion resistance of different semi-finished products of six superau stenitic steels and nickel based alloys in the condition of delivery was in vestigated in some typical standard corrosion tests. The resistance of shee ts, plates, strips, seamless tubes and welded tubes to intercrystalline cor rosion was tested according to ASTM G 28 methods A and B, as well the resis tance to pitting corrosion according to ASTM G 48 method C. The nickel base d alloys 625, C-276 and alloy 59 are resistant to the FeCl3-test according to ASTM G 48 method C and therefore a differentiation of these types in reg ard to their localized corrosion resistance was achieved only in the more a ggressive 'Green-Death'-solution. The laboratory experiments confirmed that the corrosion resistance is identical for all semi-finished products and t hat it shows only a slight dependence of the surface condition of the mater ials tested. Additionally, some typical industrial and practical applicatio ns of the six high performance materials are presented to demonstrate the e xcellent corrosion resistance in the manufactured condition.