Incoloy 825 Pipe Fittings
Incoloy 825 Pipe Fittings Manufacturer & Supplier
Incoloy 825 Pipe Fittings are high-performance nickel–iron–chromium alloy components designed for exceptional resistance to corrosion, oxidation, pitting, stress-corrosion cracking, and reducing/oxidizing environments. Stabilized with titanium, Incoloy 825 delivers superior performance in highly corrosive chemical and petrochemical applications.
This alloy offers outstanding resistance to sulfuric acid, phosphoric acid, seawater, organic acids, and alkaline solutions, making it one of the most versatile corrosion-resistant materials available. Its excellent weldability, high strength, and thermal stability allow it to perform reliably in extreme service conditions.
Key Features
Superior resistance to sulfuric, phosphoric & nitric acids
Excellent performance in seawater and chloride-rich environments
High resistance to stress-corrosion cracking & pitting
Outstanding oxidation & carburization resistance
Stable mechanical strength up to 540°C (1000°F)
Titanium-stabilized for enhanced corrosion resistance
Excellent weldability & fabricability
Suitable for aggressive chemical processing conditions
Specifications
| Category | Details |
|---|---|
| Material | Incoloy 825 |
| UNS Number | N08825 |
| WNR Number | 2.4858 |
| Standard | ASTM B366 / ASME SB366 |
| Type | Seamless, Welded, Buttweld, Forged |
| Fitting Types | Elbow, Tee, Reducer, Cap, Stub End, Cross, Nipple |
| Size Range | ½” to 48” |
| Schedule | SCH 10s–XXH |
| Dimensions | ASME B16.9, ASME B16.28, MSS SP-43 |
| Connection Type | Buttweld, Socket Weld, Threaded |
| Manufacturing | Hot Formed / Cold Formed / Fabricated |
Equivalent Grades
| Grade | UNS | Werkstoff Nr. |
|---|---|---|
| Incoloy 825 | N08825 | 2.4858 |
Available Sizes
Pipe Fittings Size: ½” to 48”
Wall Thickness: SCH 10 to XXH
Custom dimensions available on request
Chemical Composition
| Element | Percentage (%) |
|---|---|
| Nickel (Ni) | 38.0 – 46.0 |
| Chromium (Cr) | 19.5 – 23.5 |
| Iron (Fe) | Balance |
| Molybdenum (Mo) | 2.5 – 3.5 |
| Copper (Cu) | 1.5 – 3.0 |
| Titanium (Ti) | 0.6 – 1.2 |
| Manganese (Mn) | ≤ 1.0 |
| Silicon (Si) | ≤ 0.5 |
| Carbon (C) | ≤ 0.05 |
| Sulfur (S) | ≤ 0.03 |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 690 MPa |
| Yield Strength (0.2% Proof) | 275 MPa |
| Elongation | 30% |
| Hardness | 90 HRB (Max) |
Physical Properties
| Property | Value |
|---|---|
| Density | 8.14 g/cm³ |
| Melting Point | 1370 – 1400°C |
| Thermal Conductivity | 11.2 W/m·K |
| Electrical Resistivity | 1.03 µΩ·m |
| Specific Heat | 450 J/kg·K |
| Modulus of Elasticity | 195 GPa |
Types of Incoloy 825 Pipe Fittings
Elbow (45°, 90°, SR/LR)
Equal & Reducing Tee
Concentric & Eccentric Reducer
End Cap
Stub End (Short & Long)
Cross Fittings
Pipe Nipple
Custom Fabricated Fittings
Corrosion Resistance
Incoloy 825 provides outstanding resistance to:
Reducing & oxidizing acids
Sulfuric, phosphoric & nitric acid
Hydrochloric acid (moderate conditions)
Stress-corrosion cracking (chloride environments)
Pitting & crevice corrosion
Seawater & brine water
Wet corrosion & organic acids
Its titanium stabilization prevents sensitization and weld decay, ensuring long-term durability.
Heat Resistance
Good performance up to 540°C (1000°F)
High resistance to oxidation & scaling
Excellent creep-rupture strength
Stable mechanical properties in fluctuating temperatures
Suitable for heat exchangers, furnace components & high-temperature chemical processing
Heat Treatment
Annealing Temperature: 940–980°C
Cooling Method: Air cool or rapid water quenching
Titanium stabilization enhances resistance to intergranular corrosion
Welding
Incoloy 825 Pipe Fittings can be welded using:
GTAW / TIG Welding
GMAW / MIG Welding
SMAW (Stick Welding)
Submerged Arc Welding
Recommended filler metals:
Inco-Weld 55 / 65
Nickel Alloy 625 fillers for higher strength joints
Fabrication
Good hot & cold forming capability
Machining similar to stainless steels but slower due to work hardening
Requires rigid tools and slower cutting speeds
Easily shaped into complex fittings
Maintains mechanical strength after fabrication
Applications
Chemical Processing Industry
Petrochemical Plants
Oil & Gas Refineries
Pollution Control Equipment
Acid Production Units (Sulfuric & Phosphoric Acid)
Pickling Tanks & Heat Exchanger Systems
Marine & Offshore Engineering
Nuclear Fuel Reprocessing
Waste Treatment Systems