C75 corrosion

Hi everybody, I need a suggestion, how is the resistance of C75 quenched steel (C 0,700,80 % Mn 0,600,80 % Si 0,150,40
% P 0,035 % max S 0,035 ) to corrosion. How many hours it can stay in salt spary fog (DIN50021-SS) chamber without any corrosion point?
Thank you for help!
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