ER70S-A1
AWS A5.28 ER70S-A1
70S-A1 is commonly a copper coated carbon steel that contains a well balance chemistry level and 0.5% molybdenum added to increase the strength at elevated temperatures while yielding an improved corrosion resistance. 70S-A1 has a cold cracking resistant weld deposit but will likely have reduced notch toughness. Common base metal includes ASTM 204, A213-T1, A217WC1, A182-F1 and A335-P1. Preheat and Interpass 275-325° F with Postweld heat treatment 1125-1175°F may be required.
TYPICAL WIRE CHEMISTRY (%)
- | ER70S-A1 | AWS Spec |
|---|---|---|
C | 0.12 | 0.12 max. |
Mn | 1.3 | 1.30 max. |
Si | 0.3-0.7 | 0.30-0.70 |
P | 0.025 | 0.025 max. |
S | 0.025 | 0.025 max. |
Mo | 0.4-0.65 | 0.40-0.65 |
Cu | 0.35 | 0.5 max. |
Typical mechanical properties of weld metal (C02 shielding gas)
- | ER70S-A1 | AWS Spec |
|---|---|---|
Yield Strength (psi) | 58,000-60,000 | 58,000 min |
Ultimate Tensile Strength (psi) | 78,000-81,000 | 75,000 min |
Elongation in 2" (%) | 21 | 19 min |
Charpy V-notch at 0 °F (ft. lbs) | N/A | |
Reduction of Area | N/A | |
Average Brinell Hardness | N/A |