ER70S-B2L
AWS A5.28 ER70S-B2L
70S-B2L is a low alloy filler designed to produce high strengths on 1 1/4 & Cr-1/2 Mo steels found in high temperature/high pressure piping and vessels. This alloy is identical to the ER80S-B2 except it has a lower carbon content maximum that may lower the strength & hardness and exhibits greater resistance to cracking and used more often when welds are left in the as-welded condition. It may also be used on carbon steels to Cr-Mo base metals. Controlled preheat, interpass and postheat treatment may be needed to avoid cracking.
TYPICAL WIRE CHEMISTRY (%)
- | ER70S-B2L | AWS Spec |
|---|---|---|
C | 0.042 | 0.05 max. |
Mn | 0.58 | 0.40-0.70 |
Si | 0.45 | 0.40-0.70 |
P | 0.01 | 0.025 max. |
S | 0.006 | 0.025 max. |
Mo | 0.45 | 0.40-0.65 |
Cr | 1.28 | 1.20-1.50 |
Cu | 0.21 | 0.35 max |
Ni | 0.05 | 0.20 max |
Typical mechanical properties of weld metal (C02 shielding gas)
- | ER70S-B2L | AWS Spec |
|---|---|---|
Yield strength (psi) | 58,000 | 58,000 min |
Ultimate tensile strength (psi) | 75,000 | 75,000 min |
Elongation in 2" (%) | 19 | 19 min |
Charpy V-notch at 0 F (ft. lbs) | N/A |