AWS A5.28 ER90S-B3
Chromium-Molybdenum Steel Electrodes and Rods — ER90S-B3
ER90S-B3
ER90S-B3 [ER62S-B3] is used to weld 2-¼Cr-1Mo steels used for high-temperature/high-pressure piping and pressure vessels. These may also be used for joining combinations of Cr-Mo and carbon steel. All GMAW modes may be used. Careful control of preheat, interpass temperatures, and postweld heat treatment is essential to avoid cracking. These electrodes are classified after postweld heat treatment. Special care must be used when using them in the as-welded condition due to higher strength levels.
| Nominal Chemical Composition (%) | Tensile Strength | Yield Strength | Elongation | Average Impact Strength | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| C | Mn | Si | P | S | Ni | Cr | Mo | V | Ti | Zr | Al | Cu | TOE | psi (min) | MPa (min) | psi (min) | MPa (min) | % (min) | 20 ft•lbf @ |
| 0.07-0.12 | 0.40-0.70 | 0.40-0.70 | 0.025 max | 0.025 max | 0.20 max | 2.30-2.70 | 0.90-1.20 | – | – | – | – | 0.35 max | 0.50 max | 90,000 | 620 | 78,000 | 540 | 17 | Not Required |