GEN 420 Overview
GEN 420 has a higher carbon content than GEN 410. This alloy is often used for surfacing applications which call for superior resistance to abrasion. It requires preheat and interpass temperatures of not less than 400°F, followed by slow cooling. Post weld heat treatment is used to temper the weld deposit.
AWS Chemical Composition (Typical)
| %C | %Cr | %Ni | %Mo | %Mn |
|---|---|---|---|---|
|
0.25 – 0.40 0.35 |
12.0 – 14.0 12.5 |
0.60 max 0.13 |
0.75 max 0.02 |
0.60 max |
| %Si | %P | %S | %Cu |
|---|---|---|---|
|
0.50 max 0.36 |
0.03 max 0.016 |
0.03 max 0.005 |
0.75 max 0.16 |
Typical Weld Metal Mechanical Properties
| Tensile Strength | 105,000 psi | 723 MPa |
| Yield Strength | 95,000 psi | 655 MPa |
| Elongation | 16 % |
Typical Welding Parameters
| Process | Diameter | Voltage | Amperage | Gas/Flux |
|---|---|---|---|---|
| TIG (GTAW) | 1/16” 1.6 mm | 12 – 15 | 80 – 150 | 100% Ar |
| 3/32” 2.4 mm | 13 – 16 | 150 – 250 | 100% Ar | |
| 1/8” 3.2 mm | 14 – 17 | 200 – 350 | 100% Ar | |
| MIG (GMAW) | .035” 0.9 mm | 24 – 29 | 150 – 220 | 98%Ar – 2%O2 |
| .045” 1.1 mm | 25 – 30 | 160 – 260 | 98%Ar – 2%O2 | |
| Sub Arc (SAW) | .093” 2.4 mm | 28 – 33 | 250 – 450 | |
| .125” 3.2 mm | 29 – 34 | 300 – 500 |