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FV520B  Technical Data FV520B is an improved martensitic stainless steel. The characterisitics of FV520B are its good corrosion resistance, weldability and capacity of being hardened by low temperature treatment. FV520B is recommended for steam turbine blades and aircraft components. FV520B is a precipitation hardening stainless steel with excellent antigalling characteristics. FV520B has useful resistance to some acid conditions and rusting rate in marine and industrial atmospheres is low. FV520B is subject to pitting corrosion under marine organism growths and crevice corrosion on prolonged immersion  Typical Analysis FV520B            C. Cr. Cu. Mn. Mo. Nb. Ni. Si. 0.07% 13.20- 1.20- 1.00% 1.20- 0.20- 5.00- 0.70% max  14.70%    2.00%. max..   2.00%   0.70%   6.00% max. West Yorkshire Steel can supply round bar in this grade in 2 conditions: FV520B Double Overaged 750/550°C FV520B Primary Hardened Condition. Firth Vickers Silver Fox 520B FV520B 1.4594 X5CrNiMoCuNb145PH X5CrNiMoCuNb14 5 PH F V 520 B FV 520 B overaged peak hardened primary hardened