Description
Characteristics:
LKT/LKM-409Nb is a ferritic stainless steel filler wire suitable to weld 409 or 409Ti base stainless steels. The addition of niobium results in a preferential reaction with carbon, which prevent the chromium from forming carbides. This improves corrosion resistance, increases strength at elevated temperatures and promotes a ferritic microstructure. It is used primarily in the automotive industry for welding catalytic converters and other parts of the exhaust system. For best results, welding must be done in a low heat input procedure and is not recommended for multi-pass applications.
Notes on Usage:
1. For TIG process, use DC(-) current , Argon Shield and Tungsten Electrode.
2. For MIG process, use Spray Transfer or Short Circuit Transfer mode.
3. 98%Argon – 2%O₂ shielding gas is recommended in MIG process.
Classification:
AWS A5.9 ER409Nb
Typical chemical composition of weld metal (wt%)
| C | Cr | Ni | Mn | Mo |
| 0.024 | 11.5 | 0.47 | 0.68 | 0.77 |
Typical mechanical properties of weld metal
| TS N/mm2 | EL % |
| 520 | 38 |
Sizes available
| TIG Rods(mm) | 1.6 | 2.0 | 2.4 | 3.2 |
