AWS A5.9/A5.9M: ER 409Nb
StarBlaze TIG 409Nb is a ferritic stainless steel TIG wire designed for welding AISI 409 and 409Ti base metals. The addition of niobium enhances corrosion resistance, increases strength at elevated temperatures, and promotes a stable ferritic microstructure by minimising chromium carbide formation. It is widely used in automotive exhaust systems, particularly for catalytic converters. Best results are achieved with a low heat input technique, and it is not recommended for multi-pass welding.
Diameter: 1.60 mm, 2.00 mm, 2.40 mm, 3.20 mm, 4.00 mm
Pack Sizes: 5 kg/tube, 20 kg/box
Typical Chemical Composition (%)
| C | Mn | Si | Cr | Ni | Mo | Cu | S | P | Nb |
| 0.08 max | 0.80 max | 1.00 max | 10.50 – 13.50 | 0.60 max | 0.50 max | 0.75 max | 0.03 max | 0.03 max | 10*C min – 0.75 max |
Typical All-Weld Mechanical Properties
| Yield Strength (N/mm²) | Tensile Strength (N/mm²) | Elongation A5 (%) |
| ≥ 300 | ≥ 450 | ≥ 25% |
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