GEN 320LR Overview
GEN 320LR has a chemical composition similar to GEN 320 with lower level of carbon, silicon, phosphorus and sulfur. Additionally, niobium (columbium) and manganese content are controlled at narrower ranges. These modifications minimize the occurrence of hot cracking and micro‐fissuring (while maintaining the corrosion resistance) frequently encountered in fully austenitic stainless steel weld metals.
AWS Chemical Composition (Typical)
| %C | %Cr | %Ni | %Mo | %Mn |
|---|---|---|---|---|
|
0.025 max 0.007 |
19.0 – 21.0 20.02 |
32.0 – 36.0 32.82 |
2.0 – 3.0 2.38 |
1.5 ‐ 2.0 1.84 |
| %Si | %P | %S | %Cu | %Nb (Cb) |
|---|---|---|---|---|
|
0.15 max 0.07 |
0.015 max 0.012 |
0.02 max 0.001 |
3.0 – 4.0 3.35 |
8x%C – 0.4 0.23 |
Typical Weld Metal Mechanical Properties
| Tensile Strength | 86,000 psi | 593 MPa |
| Yield Strength | 57,000 psi | 393 MPa |
| Elongation | 34% |
Typical Welding Parameters
| Process | Diameter | Voltage | Amperage | Gas/Flux |
|---|---|---|---|---|
| TIG (GTAW) | 1/16” (1.6 mm) | 14 – 17 | 90 – 130 | 100% Ar |
| 3/32” (2.4 mm) | 15 – 20 | 120 – 175 | 100% Ar | |
| MIG (GMAW) | .035” (0.9 mm) | 29 – 33 | 160 – 190 | 98%Ar – 2%O2 |
| .045” (1.1 mm) | 29 – 33 | 180 – 220 | 98%Ar – 2%O2 | |
| Sub Arc (SAW) | .093” (2.4 mm) | 29 – 32 | 300 – 375 | |
| .125” (3.2 mm) | 29 – 32 | 400 – 550 |