AWS A5.9
AWS Class ER409Nb
UNS S40940 

ER409Nb is a filler wire that has a ferritic microstructure and is used to join similar base metals. This alloy has the addition of niobium, which creates niobium carbides and prevents chromium carbides, therefore giving ER409Nb a better resistance to corrosion. ER409Nb is typically used in the production of exhaust system parts such as mufflers and catalytic converters.

Tensile Strength: 67,000 psi
Yield Strength: 50,500 psi
Elongation: 26%

Available in multiple sizes and diameters

                                                                                 Chemical Composition (Wt%):

SiMnCuMoSNiCrPCNb + Ta
1.00.900.750.500.030.6010.5- x C) min - 0.75 max
Note: Single values are maximum unless otherwise noted.

View/Download Data Sheet

ER409Nb stainless steel data sheet