Use & Application
This type is the same as ER409, except that niobium is added to form niobium carbides (NbC), preventing the formation of chromium carbides (Cr3C2), thus improving corrosion resistance. The addition of niobium also increases strength at high temperature and promotes a ferritic micro-structure. Consumables used for welding similar 12% Cr ferritic steels in exhaust system components such as manifolds, mufflers, catalytic converters, and tubing. For the best results, welding must be done in a low heat input procedure and is not recommended for multi-pass applications.
Alloy type
Ferritic stabilized stainless solid welding wire of 12% Cr and 0,4% Nb type.
Microstructure
Ferrite.
Materials to be welded

Used for welding similar 12% Cr ferritic steels.
ASTM: 409, 409Ti, 409Nb, 439, 430.

Products of the line 409Nb

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