ER90S-B9
AWS A5.28 ER90S-B9
ER90S-B9 is a 9% Cr & 1 Mo wire modified with niobium (CB) and vanadium designed to provide creep-rupture strength, toughness, fatigue life, oxidation and corrosion resistance at elevated service temperature and high pressures. This wire is suitable for 9% Chromium steels such as P91, T91, F91 and ASTM A-213, A-335, A-387. Applications include fabrication of turbines, header systems, steam piping, electric generation, and petrochemical equipment. Controlled preheat, interpass and postheat treatment may be needed to avoid cracking.
TYPICAL WIRE CHEMISTRY (%)
- | ER90S-B9 | AWS Spec |
|---|---|---|
C | 0.09 | 0.07-0.13 |
Mn | 0.54 | 1.20 max. |
Si | 0.22 | 0.15-0.50 |
P | 0.008 | 0.10 max. |
S | 0.002 | 0.10 max. |
Mo | 0.90 | 0.85-1.20 |
Cr | 8.90 | 8.00-10.50 |
N | 0.044 | 0.03-0.07 |
Nb | 0.046 | 0.02-0.10 |
V | 0.22 | 0.15-0.30 |
Ni | 0.46 | 0.80 max. |
Cu | 0.13 | 0.20 max. |
Al | 0.016 | 0.04 max. |
Typical mechanical properties of weld metal (C02 shielding gas)
- | ER90S-B9 | AWS Spec |
|---|---|---|
Yield strength (psi) | 95,500 | 60,000 min |
Ultimate tensile strength (psi) | 110,500 | 90,000 min |
Elongation in 2" (%) | 17.3 | 16 min |
Charpy V-notch at 0 F (ft. lbs) | N/A |