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ER409Nb is a ferritic stainless steel welding
alloy used to weld types 409 and 409Ti base
metals. The addition of columbium leads to
a preferential reaction with carbon which
interrupts chromium from forming carbides.
This improves corrosion resistance, increases
strength at high temperatures, and promotes
ferritic microstructure.
AWS Specification
AWS A5.9/A5.9M:2006
AWS Classification ER409Nb
Welding Current
DCEP
Typical Wire Chemistry
C 0.08
Cr 10.5 - 13.5
Ni 0.6
Mo 0.50
Mn 0.8
Si 1.0
P 0.04
S 0.03
Cu 0.75
Nb 10xCmin/0.75max
Typical Mechanical Properties
(As Welded)
Yield Strength, ksi 50
Tensile Strength, ksi 67
Elongation%, min 26
Welding Positions
F,V,OH,H
Available Diameters MIG with
Operating Range in Amps
.030" 50 - 100
.035" 160 - 210
.045" 180 - 250
Available Diameters TIG with
Operating Range in Amps
.035" 60 - 90
.045" 80 - 110
1/16" 90 - 130
3/32" 120 - 175
1/8" 150 - 220
5/32" 170 - 350
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