Super ferritic Stainless Steel has a structure and properties similar to the common ferritic alloys, but they contain enhanced levels of chromium and molybdenum to increase their resistance to high temperature and corrosive environments such as seawater.Stainless Steel – SuperferriticAlloy (UNS Designation) End UseComposition nominal wt%SpecificationsDensity lb/in3 (g/cm3)Tensile Strength ksi. (MPa)0.2%Yield Strength ksi. (MPa)Elong- ation %HardnessS44735 Welded stainless steel tubing used in seawater and other applications requiring extreme resistance to chloride pitting, crevice corrosion and stress corrosion crackingC 0.03 max, Mn 1.0 max, P 0.04 max, S 0.03 max, Si 1.0 max, Cr 28.0-30.0, Ni 1.0 max, Mo 3.6-4.2, N 0.045 max, (Ti+Cb) 0.2-1.0, (Ti+Cb) 6x(C+N) min, Fe BalanceASTM A2400.277 (7.67)80 min (550 min)60 min (415 min)18 min25 Rockwell C maxS44627 Solenoid valves, Pressure vessels, Coker components, Heat exchanger stainless steel tubing, Air preheaters, Heat recuperatorsC 0.01 max, Mn 0.4 max, Si 0.4 max, Cr 25.0-27.5, Ni 0.5 max, Mo 0.75-1.5, N 0.015 max, Cu 0.2 max, Cb 0.05-0.2, (Ni+Cu) 0.5 max, Fe BalanceASTM A-240 ASME SA-2400.280 (7.76)65 min (450 min)40 min (275 min)22 min
Source: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)
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