Material Grade: Incoloy 825 Nickel-based Alloy
United States grade: UNSN08825
German grade: W.Nr.2.4858
Chinese grade: NS142
Introduction and properties of Incoloy825 (n08825, 2.4858) nickel-based alloy
Incoloy825 (n08825, 2.4858) alloy is a fully austenite Ni-Fe-Cr alloy that is stable with Cu and mo with Ti.
Incoloy825 has the following features
(1) Good stress corrosion cracking resistance.
(2) Have good pitting and crevice corrosion resistance
(3) Good antioxidant and non-oxidative thermal acid properties
(4) Have good mechanical properties at room temperature and high temperature of 550℃
(5) Manufacturing temperature below 450℃ for pressure vessel certification
Incoloy825 (n08825, 2.4858) Alloy Chemical Composition
| C≤ | Si≤ | Mn≤ | P≤ | S≤ | Cr≥ | Ni≥ | Mo≥ | Cu≤ |
| 0.05 | 0.50 | 1.00 | 0.035 | 0.030 | 19.5-23.5 | 38.0-46.0 | 2.5-3.5 | 1.5-3.0 |
| other | N≤ | Al≤ | Ti≤ | Fe≤ | Co≤ | V≤ | W≤ | Nb≤ |
| - | 0.20 | 0.6-1.2 | margin | - | - | - | - |
Physical properties of Incoloy825 (n08825, 2.4858) alloy
Density: ρ=8.1g/cm3
Melting temperature range: 1370~1400℃
| Temperature ℃ | Specific heat capacity J/KgK | Thermal conductivity W/mK | Resistivity μΩcm | Elastic modulus KN/mm2 | Thermal expansion coefficient 10-6/K |
| 20 | 440 | 10.8 | 112 | 195 |
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| 93 |
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| 100 | 462 | 12.4 | 114 | 190 | 14.1 |
| 200 | 488 | 14.1 | 118 | 185 | 14.9 |
| 204 |
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| 300 | 514 | 15.6 | 120 | 179 | 15.2 |
| 316 |
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| 400 | 540 | 16.9 | 124 | 174 | 15.6 |
| 427 |
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| 500 | 565 | 18.3 | 126 | 168 | 15.8 |
| 538 |
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| 600 | 590 | 19.6 | 126 | 161 | 16.0 |
| 649 |
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| 700 | 615 | 21.0 | 127 | 154 | 16.7 |
| 760 |
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| 800 | 655 | 23.2 | 128 | 142 | 17.2 |
| 871 |
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| 900 | 680 | 25.7 | 129 | 130 | 17.6 |
| 982 |
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| 1000 | 710 | 28.1 | 130 | 119 | 17.9 |
The mechanical properties of Incoloy825 (n08825, 2.4858) alloy are as follows
The properties listed in the table below are suitable for products after softening annealing (stable annealing). Special properties of non-standard size materials can be provided according to the specific application requirements.
●Mechanical properties at room temperature (*** minimum value)
| product | Specification | Yield strength RP0.2N/mm2 | Yield strength RP1.0N/mm2 | Tensile strength RmN/mm2 | Elongation A50% |
| Thin sheet strip/cold rolled sheet/hot rolled | 0.5-6.4 | 240 | 265 | 585 | 30 |
| 5-100 |
| Cold processing of bars | 1.6-64 |
| 25-100 |
| >100-240 | 220 | 250 | 550 | 35 |
| Cold processing of pipes | 64-240 | 180 | - | 530 | 30 |
| 5-100 | 240 | 265 | 585 | 30 |
| Condensing and heat exchangers | 16-76 |
●High temperature mechanical properties (*** minimum value)
| product | Specification | Yield strength RP0.2N/mm2 | Yield strength RP1.0N/mm2 | Tensile strength RmN/mm2 | Elongation A50% |
| Thin sheet strip/cold rolled sheet/hot rolled | 0.5-6.4 | 240 | 265 | 585 | 30 |
| 5-100 |
| Cold processing of bars | 1.6-64 |
| 25-100 |
| >100-240 | 220 | 250 | 550 | 35 |
| Cold processing of pipes | 64-240 | 180 | - | 530 | 30 |
| 5-100 | 240 | 265 | 585 | 30 |
| Condensing and heat exchangers | 16-76 |
●Incoloy825ISOV type notch impact test
Average room temperature: axial >=150J/cm2, radial >=100J/cm2, time-temperature-sensitization curve.
| Welding process | Heat input per unit length kJ/cm | Welding process | Heat input per unit length kJ/cm |
| GTAW, manual/full mechanized | ≤ 10 | MIG/MAG, manual/full mechanized | ≤11 |
| Hot Wire GTAW | ≤ 6 | Manual arc welding (SMAW) | ≤ 7 |
| Plasma arc | ≤ 10 |
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Incoloy825 variety specifications and supply status
1. Variety classification: Danyang Xinmao Alloy can produce various specifications of Incoloy825 seamless pipe, Incoloy825 steel plate, Incoloy825 round steel, Incoloy825 forgings, Incoloy825 flanges, Incoloy825 rings, Incoloy825 welded pipes, Incoloy825 steel strips, Incoloy825 wire and supporting welding materials.
2. Delivery status: seamless pipe: solid solution + acid white, length can be determined; plate: solid solution, pickling, edge cutting; welded pipe: solid solution acid white + RT% flaw detection, forgings: annealing + car light; rods are in forged, surface polished or car light; strips are delivered by cold rolling, solid solution soft, de-oxidation; silk is delivered in solid solution pickling disk shape or straight strip shape, solid solution straight strip fine polished state.