Incoloy 825 UNS N08825 2.4858 Corrosion-Resisting Superalloy Bars and Plates
This nickel-iron-chromium-molybdenum-copper-based corrosion-resistant alloy achieves outstanding overall performance through a carefully balanced composition. It exhibits exceptional corrosion resistance in reducing media such as sulfuric acid and phosphoric acid, boasts excellent resistance to chloride-ion stress-corrosion cracking, and demonstrates good resistance to pitting and crevice corrosion (PREN ≥ 35). Additionally, it combines superior mechanical properties with excellent formability and machinability.
Applications of Incoloy 825
In the oil and gas sector, this material is particularly suitable for downhole tools, oil pipelines, and acidic gas treatment systems used in the extraction of high-sulfur oil and gas. In the chemical industry, it is commonly employed in core equipment such as sulfuric acid and phosphoric acid production units, pickling lines, and mixed-acid reactors. In marine engineering, it is an ideal material choice for seawater heat exchangers, subsea pipelines, and desalination equipment.
Equivalent Grades and Commonly Used Specifications of Incoloy 825
| Steel Grade | Specification | Specification Name |
| NS1402 /
0Cr21Ni42Mo3Cu2Ti NS142 |
GB/T 15007 | Designations of corrosion-resisting alloy |
| YB/T 5353 | Hot-rolled plates of corrosion-resisting alloys | |
| YB/T 5354 | Cold-rolled plates of corrosion-resisting alloys | |
| YB/T 5355 | Cold-rolled strips of corrosion resisting alloy | |
| GB/T 15008 | Corrosion resistant alloy bars | |
| UNS N08825 / Incoloy825 | ASTM B424 | Standard Specification for Ni-Fe-Cr-Mo-Cu Alloy Plate, Sheet, and Strip |
| ASTM B423 | Standard Specification for Nickel-Iron-Chromium-Molybdenum-Copper Alloy Seamless Pipe and Tube | |
| ASTM B425 | Standard Specification for Nickel-Iron-Chromium-Molybdenum-Copper Alloys Rod and Bar | |
| ASTM B564 | Standard Specification for Nickel Alloy Forgings | |
| ASTM B163 | Standard Specification for Seamless Nickel and Nickel Alloy Condenser and Heat-Exchanger Tubes | |
| NCF825 | JIS G 4901 | Corrosion-Resistant and Heat-Resistant Superalloy, Nickel and Nickel Alloy—Bars |
| JIS G 4902 | Corrosion-Resistant and Heat-Resistant Superalloy, Nickel and Nickel Alloy—Plate, Sheet and Strip | |
| 2.4858/
NiCr21Mo |
DIN 17750 | Wrought Nickel and Nickel Alloy Sheet, Plate and Strip |
| DIN 17752 | Rods and Bars of Wrought Nickel and Nickel Alloys-Properties | |
| DIN 17744 | Wrought Nickel Alloys with Molybdenum and Chromium-Chemical Composition | |
| Products produced as per other specifications or technical agreements (if need) are available. | ||
Typical Chemical Composition of Incoloy 825
|
Elements |
C | Si | Mn | Ti | S | P | Cr | Ni | Fe | Al | Cu |
Mo |
|
Mass Fraction% |
≤0.05 | ≤0.50 | ≤1.00 | 0.60~1.20 | ≤0.03 | ≤0.03 | 19.50~23.50 | 38.00~46.00 | ≥22.00 | ≤0.20 | 1.50~3.00 |
2.50~3.50 |
Typical Heat Treatment Condition and Mechanical Properties of Incoloy 825
|
Delivery Condition |
Mechanical Properties and Hardness of Heat-Treated Specimens | ||||||
| Rp0.2/(N/mm2) | Rm/(N/mm2) | A/% | Zb/% | Aku2d/J | HBW |
HRC |
|
|
Solution-treated Condition1000℃-1050℃ |
≥240 | ≥590 | ≥30 | / | / | / |
/ |
| Products produced as per other specifications or technical agreements (if need) are available. | |||||||
Product Forms and Size Range of Incoloy 825
| Product forms |
Size range |
|
Bars |
Diameter or side length: 5.0mm~1000mm |
| Flats |
thickness: 4.0mm~1000mm width: 300mm~2200mm |
| Produce as other form and size according to technical requirements are available. | |
