Nickel and nickel alloys · Alloy 800H / Incoloy 800H / UNS N08810 / 1.4958
Incoloy 800H Alloy (UNS N08810): Characteristics and Supplies
Technical Characteristics of Incoloy 800H
| Product Form | Parameter | Value |
|---|---|---|
| strip, | 163, | |
| strip, | 163, | |
| strip, | 366, | |
| strip, | 366, | |
| wire, | 407, | |
| wire, | 407, | |
| forgings | 408, | |
| forgings | 408, | |
| 409, | ||
| 409, | ||
| 514, | ||
| 514, | ||
| 515, | ||
| 515, | ||
| 564, | ||
| 564, | ||
| 751, | ||
| 751, | ||
| 775, | ||
| 775, | ||
| 800 | ||
| bar, | 800H, | |
| alloys | plate, | 800H, |
| 924 | ||
| 924 | ||
| hex, | 3220 | |
| N08810 | ||
| B | ||
| B | ||
| B | ||
| B | ||
| B | ||
| B | ||
| B | ||
| H, | ||
| SB | ||
| SB | ||
| SB | ||
| SB | ||
| SB | ||
| SB | ||
| SB | ||
| UNS | ||
| Name | Sheet, | Alloy |
| Main | Sheet, | ASME: |
| Main | Sheet, | ASTM: |
| forgings | Alloy | |
| strip, | Nicrofer | |
| wire, | H, | |
| bar, | B | |
| bar, | SB | |
| specifications | plate, | B |
| specifications | plate, | SB |
| pipe, | B | |
| pipe, | SB | |
| pipe, | VDM | |
| hex, | B | |
| hex, | SB | |
| strip, | Incoloy |
Incoloy 800H alloy (UNS N08810) is an improved modification of Incoloy 800, developed for operation under high temperatures and significant mechanical loads. A key distinguishing feature is the strict control of carbon content in the range of 0.05–0.10%. This feature ensures increased stability of the microstructure and mechanical properties during prolonged exposure to high temperatures and creep, which is critically important for demanding applications in the energy and chemical industries. The optimized chemical composition guarantees excellent resistance to deformation and failure in extreme conditions.
Chemical Composition of Alloy 800H in %
| Ni | Parameter | Value |
|---|---|---|
| 30,0-35,0 | Al | 0,15-0,60 |
| 30,0-35,0 | Al+Ti | 0,85-1,20 |
| 30,0-35,0 | C | 0,05-0,10 |
| 30,0-35,0 | Cr | 19,0-23,0 |
| 30,0-35,0 | Fe | ≥39,5 |
| 30,0-35,0 | Ti | 0,15-0,60 |
Mechanical Properties of Alloy 800H
| Creep Rupture Strength (1000h) | Parameter | Value |
|---|---|---|
| 650 | Limit | 165 |
| 650 | Limit | 24,0 |
| 705 | Limit | 105 |
| 705 | Limit | 15,0 |
| 760 | Limit | 10,0 |
| 760 | Limit | 70 |
| 870 | Limit | 32 |
| 870 | Limit | 4,7 |
| 980 | Limit | 14 |
| 980 | Limit | 2,0 |
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| (1000h) | ||
| (1000h) | ||
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| (1000h) | ||
| (1000h) | ||
| (1000h) | ||
| (1000h) | ||
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| (1000h) | ||
| (1000h) | ||
| °С | long-term | |
| °С | long-term | |
| °С | long-term | |
| °С | long-term | |
| °С | long-term | |
| °С | long-term | |
| °С | long-term | |
| °С | long-term | |
| °С | long-term | |
| °С | long-term | |
| long-term | ||
| long-term | ||
| strength | ||
| strength | ||
| strength | ||
| strength | ||
| strength | ||
| strength | ||
| strength | ||
| strength | ||
| strength | ||
| strength | ||
| strength | ||
| strength | ||
| Temperature | Limit | ksi |
| Temperature | Limit | MPa |
Physical and Thermal Properties
The density of Incoloy 800H is 7.94 g/cm³. This alloy is characterized by outstanding metallurgical stability, which ensures the preservation of operational characteristics during long-term operation in high-temperature regimes. An additional advantage is the low coefficient of thermal expansion, which minimizes thermal stresses in structures and increases their reliability and durability.
| Melting Range | Parameter | Value |
|---|---|---|
| Thermal Conductivity | 1357-1385 °С | 11,5 W/m*°С |
| Specific Heat | 1357-1385 °С | 460 J/kg*°С |
| Electrical Resistivity | 1357-1385 °С | 0,989 µohm*m |
EV Group China supplies rolled metal products made of Alloy 800H, specifically designed for critical components of petrochemical equipment, power plants, and high-temperature reactors. Thanks to optimal nickel and chromium alloying, the material demonstrates exceptional resistance to carburization, nitriding, and oxidation in aggressive gaseous environments, ensuring durability and operational safety.
Welding Characteristics and Corrosion Resistance
Incoloy 800H alloy is perfectly amenable to all standard industrial welding methods, including TIG/GTAW and PAW. To ensure maximum strength and corrosion resistance of welded joints, EV Group China recommends using specialized filler materials, such as ERNiCr-3 or its analogs. This guarantees equivalent strength of the weld seam to the base metal and prevents localized corrosive processes in the heat-affected zone, which is critically important for the long-term reliability of structures.
Industrial Applications
- Production of tubes for pyrolysis furnaces and ethylene plants, where high heat resistance and resistance to carburization are required.
- Components of heat exchange equipment operating in environments with chloride gases, due to high corrosion resistance.
- Components of coal gasification systems, exposed to aggressive gas mixtures and high temperatures.
- Pipelines and reactor assemblies operating in steam and helium atmospheres at elevated temperatures and pressures.