ASTM B983 Inconel 740H N07740 Nickel Alloy Steel Seamless Tube for Boiler
ASTM B983 Inconel 740H N07740 Nickel Alloy Steel Seamless Tube for Boiler
INCONEL alloy 740H (UNS N07740) is derivation of NIMONIC alloy 263. With its higher content of chromium (24.5%),
alloy 740H offers a significant improvement is resistance to high temperature corrosion mechanisms. Alloy 740H is
age hardened by the precipitation of a second phase, gamma prime (γ’). By balancing the hardener content (niobium,
aluminum and titanium), alloy 740H exhibits good thermal stability in addition to high strength.
Physical Properties
| Density | g/cm3 | 8.05 | |
|---|---|---|---|
| lb/in.3 | 0.291 | ||
| Melting Range | °F | 2350 - 2484 | |
| °C | 1288 - 1362 | ||
| Electrical Resistivity | Ω-circ mil/ft | 702.7 | |
| μ Ω -m | 1.168 | ||
Mechanical Properties
| Test Temperature °F (°C) |
0.2% Yield Strength, Ksi (MPa) |
Ultimate Tensile Strength, Ksi (MPa) |
Elongation % | Reduction of Area % |
|---|---|---|---|---|
| Transverse Orientation | ||||
| Room Temp. | 105 (724) | 154.6 (1066) | 23.7 | 28.1 |
| 1292°F (700°C) | 82.2 (567) | 124.9 (861) | 17 | 23.1 |
| 1337°F (725°C) | 85.4 (589) | 125 (862) | 22.8 | 37.4 |
| 1382°F (750°C) | 86.4 (596) | 118.6 (818) | 23.9 | 28.7 |
| 1424°F (775°C) | 80.8 (557) | 110.1 (759) | 22.1 | 30.7 |
| 1472°F (800°C) | 86.2 (594) | 100.2 (691) | 23.5 | 31.2 |
| Longitudinal Orientation | ||||
| Room Temp. | 107.7 (742) | 164.4 (1133) | 24.3 | 39.8 |
| 1292°F (700°C) | 88.2 (608) | 132.3 (912) | 31.9 | 35.7 |
| 1337°F (725°C) | 87 (560) | 126.3 (871) | 28.4 | 34.4 |
| 1382°F (750°C) | 83.5 (576) | 118.2 (815) | 22.9 | 24 |
| 1424°F (775°C) | 81.8 (564) | 111.1 (766) | 27.9 | 37.1 |
| 1472°F (800°C) | 79.3 (547) | 100 (689) | 31.5 | 40.9 |
INCONEL alloy 740H is quite an impressive material with its high strength, creep resistance at elevated temperatures, and resistance to coal ash corrosion! It's interesting to know that it was initially intended for A-USC boiler tubes but found applications in steam headers as well due to its remarkable properties.
The wide size range of applications, from conventional sizes for boiler tubes to much larger sizes for main steam header pipes and even seamless steam reheat piping, showcases the versatility and suitability of INCONEL alloy 740H for various high-temperature and corrosive environments within power plants.
Overall, it seems like a high-performance material that plays a crucial role in ensuring the efficiency and durability of equipment in power generation facilities.
Application
- Petro Processing
- Power Generation
- Welding Products
- more.
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