Incoloy 825 / Nickel Alloy 825 / UNS N08825 2.4858
Alloy 825 (UNS N08825) or Incoloy 825 is an austenitic nickel-iron-chromium alloy with additions of molybdenum, copper and titanium. It was developed to provide exceptional resistance to numerous corrosive environments, both oxidizing and reducing
The nickel content of Alloy 825 makes it resistant to chloride stress-corrosion cracking, and combined with molybdenum and copper, provides substantially improved corrosion resistance in reducing environments when compared to conventional austenitic stainless steels. The chromium and molybdenum content of Alloy 825 provides resistance to chloride pitting, as well as resistance to a variety of oxidizing atmospheres. The addition of titanium stabilizes the alloy against sensitization in the as-welded condition. This stabilization makes Alloy 825 resistant to intergranular attack after exposure in the temperature range which would typically sensitize un-stabilized stainless steels. Alloy 825 is resistant to corrosion in a wide variety of process environments including sulfuric, sulfurous, phosphoric, nitric, hydrofluoric and organic acids and alkalis such as sodium or potassium hydroxide, and acidic chloride solutions.
Incoloy 825 Equivalent Grades
| STANDARD | WERKSTOFF NR. | UNS | JIS | BS | GOST | AFNOR | EN | OR |
| Incoloy 825 | 2.4858 | N08825 | NCF 825 | NA 16 | ЭП703 | NFE30C20DUM | NiCr21Mo | XH38BT |
Incoloy 825 Chemical Composition
| Grade | C | Mn | Si | Al | S | Cr | Cu | Ni | Fe | Ti |
| Incoloy 800 | 0.05 max | 1.00 max | 0.05 max | 0.02 max | 0.03 max | 19.50-23.50 | 1.50-3.00 | 38.0-46.0 | 22.0 min | 0.06 – 1.20 |
Incoloy 825 Mechanical Properties
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 8.14 g/cm3 | 1400 °C (2550 °F) | Psi – 80,000 , MPa – 550 | Psi – 32,000 , MPa – 220 | 30 % |
1. Excellent Corrosion Resistance: Alloy 825 tube is highly resistant to corrosion, pitting, and stress corrosion cracking in various corrosive environments like nitric acid, sulfuric acid, phosphoric acid, and others.
2. High-Temperature Strength: The inconel 825 tube can withstand high temperatures up to 550°C (1020°F) and still maintain its excellent mechanical properties.
3. Good Weldability: Incoloy 825 pipe can be easily welded with various welding processes, including gas tungsten arc welding, gas metal arc welding, and shielded metal arc welding.
Alloy 825 N08825 Pipes are available according to standard ASTM B 163/ ASME SB 163 ASTM B 423/ ASME SB 423 ASTM B 704/ ASME SB 704 ASTM B 705/ ASME SB 705 ASTM B 751/ ASME SB 751 ASTM B 775/ ASME SB 775 ASTM B 829/ ASME SB 829
Alloy 825 N08825 Flanges according to ASTM B 564/ ASME SB 564
Alloy 825 N08825 Round bar according to ASTM B 425/ ASME SB 425 ASTM B 564/ ASME SB 564
Alloy 825 N08825 Pipe fittings (Elbow, Reducer, Tee, Cap, Stub End) ASTM B 366/ ASME SB 366
