Alloy 625, a nickel-chromium alloy, is popular for its exceptional corrosion resistance, improved fabricability and high strength from cryogenic temperatures to 1800° F (982° C). Precipitation hardening is not required, as the strength of Alloy 625 is derived from the stiffening effect of columbium and molybdenum on its nickel-chromium matrix. Alloy 625 also offers exceptional resistance to oxidation, carburization and a wide spectrum of severe and corrosive environments.
Availability – Alloy 625
Welded Pipe 1/2″ – 8″
Butt-Weld Fittings 1/2″ – 8″
Flanges 1/2″ – 8″
Specifications – Alloy 625
| ASTM | 8443, 8705, B366, B446, B546 |
| ASME | SB443, SB705, SB366, SB446, SB564 |
Chemical Composition – Alloy 625
| C | CR | FE | NI | AI | TI | CB+TA |
|---|---|---|---|---|---|---|
| Max | Max | Min | Max | Max | ||
| 0.10% | 20%-23% | 5% | 58.0% | .40% | 0.40% | 3.15% – 4.15% |
Design Features -Alloy 625
- Excellent resistance to pitting, crevice corrosion, impingement corrosion and intergranular attack.
- Virtually immune to chloride-induced stress corrosion cracking.
- Exceptional resistance to mineral acids, including: nitric, phosphoric, sulfuric and hydrochloric acids.
- Exceptional resistance to alkalis and organic acids
- Heightened mechanical properties.
Typical Applications – Alloy 625
- Structures in seawater applications and prone to high mechanical stress
- Chimney linings
- Components for flue gas scrubbers
- Equipment used in the production of superphosphoric acid
- Sour gas production tubes
- Marine equipment
- Aerospace industry
Tensile Requirements – Alloy 625
Tensile Strength (KSI): 120
Yield Strength (KSI): 60
KSI can be converted to MPA (Megapascals) by multiplying by 6.895.