Oerlikon Cromocord 91 description: CROMOCORD 91 is a basic coated 9%Cr 1%Mo V-Nb-N electrode suitable for welding creep resistant steels like X10CrMoVNb9-1, SA387 Gr91 Cl1 and Cl2, SA 182 Gr F91, SA 335 Gr P91 and similar. Excellent tensile strength at high temperature, approved up to +650C. The fine tuning of the weld metal chemistry allows to guarantee very low impurities. Mn+Si restriction (<1,5%) lower Ac1 to avoid harmful microstructure transformation during PWHT. Very low diffusible hydrogen (HD<4ml/100g).