Einfluss der Halbzeugform auf die Korrosionsbeständigkeit hochlegierter Ni-Cr-Mo-Werkstoffe

The corrosion resistance of different semi-finished products of six superaustenitic steels and nickel based alloys in the condition of delivery was investigated in some typical standard corrosion tests. The resistance of sheets, plates, strips, seamless tubes and welded tubes to intercrystalline corrosion was tested according to ASTM G 28 methods A and B, as well the resistance to pitting corrosion according to ASTM G 48 method C. The nickel based alloys 625, C-276 and alloy 59 are resistant to the FeCl 3 -test according to ASTM G 48 method C and therefore a differentiation of these types in regard to their localized corrosion resistance was achieved only in the more aggressive Green-Death'-solution. The laboratory experiments confirmed that the corrosion resistance is identical for all semi-finished products and that it shows only a slight dependence of the surface condition of the materials tested. Additionally, some typical industrial and practical applications of the six high performance materials are presented to demonstrate the excellent corrosion resistance in the manufactured condition.