| Equivalent Grade | ● UNS: N07740 ● W.Nr.: 2.4663 ● Chinese Standard: GH4742 |
| Standard | ● Sheet/Plate: ASTM B622 ● Seamless Pipe: ASTM B619 ● Bar: ASTM B637 ● Complies with ASME Code Case 2702 |
| Alloy Type | Nickel-Chromium-Cobalt Based Precipitation Hardening Superalloy (γ' Phase Strengthened) |
| Standard | Sheet, Bar, Pipe, Tube, Fittings, Flange, Welding Products, etc. |
| Key Properties | ● Excellent high-temperature strength, outstanding creep rupture strength at 700-760℃ ● Good resistance to coal ash corrosion, oxidation, carburization and sulfidation ● Good hot and cold forming performance, excellent weldability, proper post-weld heat treatment required |
| Applicable Environment | Advanced Ultra-Supercritical (A-USC) power station environment, high-temperature and high-pressure steam environment, coal-fired boiler scenarios, high-temperature flue gas environment, SCO₂ cycle systems |
| Typical Applications | Power Station Boiler Superheater/Reheater Tubes, Main Steam Headers, High-Temperature Heat Exchangers, Fgd Equipment, Nuclear And New Energy Power Generation Equipment Components, Thick-Walled Pipes, etc. |