Incoloy 825 Pipes & Pipe Fittings
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Incoloy 825 Pipes & Fittings Supplier in Mumbai, India
Nicorex Alloys is an ISO 9001 / ISO 14001 certified supplier, importer, and stockist of Incoloy 825 pipes and fittings based in Mumbai, India. We supply seamless pipes as per ASTM B423 / ASME SB423, welded pipes as per ASTM B705/B775, condenser tubes as per ASTM B163, and buttweld fittings as per ASTM B366 (WPNICMC).
Incoloy 825 was designed for environments with sulfuric acid, phosphoric acid, and nitric acid in the same plant. This titanium-stabilised nickel-iron-chromium alloy resists both reducing and oxidising acids from a single composition. They consist of 38–46% Ni, 19.5–23.5% Cr, 2.5–3.5% Mo, 1.5–3.0% Cu, and 0.6–1.2% Ti. Molybdenum plus copper handle reducing media (H₂SO₄, H₃PO₄), chromium resists oxidising environments (HNO₃), and titanium prevents intergranular corrosion during welding and elevated-temperature service. Alloy 825 pipes and fittings are NACE MR-01-75 listed for sour gas (H₂S) environments.
Incoloy 825 is also known as UNS N08825 and Werkstoff 2.4858. It has a minimum tensile strength of 586 MPa (85 ksi), a yield strength of 241 MPa (35 ksi), and an elongation of 30%. Hardness is 90 HRB max. UNS N08825 pipe sizes range from NPS 1/2″ to 24″, SCH 5S through XXS. Buttweld fittings sizes range from NPS 1/2″ to 48″ (elbows, tees, reducers, caps, stub ends). Incoloy 825 is solution annealed at 940-980°C (1725-1800°F). Key industries include chemical processing, oil and gas, pollution control, nuclear fuel reprocessing, acid production, and marine.
Incoloy 825 Pipes & Fittings – Specifications
Specifications of Incoloy 825 (UNS N08825) pipes and fittings, including standards, dimensions, schedules, sizes and conditions, are covered in the table below:
| Pipes Specifications | |
|---|---|
| Parameter | Details |
| Pipe & Tube Standards | ASTM B423, B705, B704, B775, B751, B163 / ASME SB423, SB705, SB704, SB775, SB751, SB163 |
| Size Range | NPS 1/2″ to 24″; OD 6.35–609.6 mm |
| Wall / Schedule | SCH 5S, 10S, 40S, 40, 80S, 80, 120, 160, XXS |
| Condition | Solution annealed at 940°C (1725°F) |
| Fittings Specifications | |
| Parameter | Details |
| Fittings Standards | Buttweld Fittings: ASTM B366 / ASME SB366 (WPNICMC) |
| Dimensions | ASME B16.9, B16.28, MSS SP-43 |
| Size | BW Size: NPS 1/2″ to 48″ (Seamless to 24″, Fabricated beyond) |
Chemical Composition of Incoloy 825 Pipes & Fittings
As per ASTM B423, the chemical composition of Incoloy 825 pipes and fittings, and its key alloying elements are covered in the table below:
| Material / Element | Nickel (Ni) | Iron (Fe) | Chromium (Cr) | Molybdenum (Mo) | Copper (Cu) | Titanium (Ti) | Carbon (C) | Manganese (Mn) | Silicon (Si) |
|---|---|---|---|---|---|---|---|---|---|
| Min (%) | 38.0 | 22.0 | 19.5 | 2.5 | 1.5 | 0.6 | – | – | – |
| Max (%) | 46.0 | – | 23.5 | 3.5 | 3.0 | 1.2 | 0.05 | 1.0 | 0.5 |
Nickel at 38–46% provides good resistance to chloride SCC. Chromium (19.5–23.5%) resists oxidising acids, including nitric acid. Mo (2.5–3.5%) plus Cu (1.5–3.0%) together resist reducing acids: sulfuric and phosphoric. Titanium (0.6–1.2%) stabilises the alloy against sensitisation and intergranular corrosion during welding and service at elevated temperatures.
Mechanical Properties of Incoloy 825 Pipes & Fittings
The mechanical properties of Incoloy 825 pipes and fittings in the annealed condition as per ASTM B423 are covered in the table below:
| Property | Tensile Strength (min) | Yield 0.2% Offset (min) | Elongation (min) | Hardness (max) |
|---|---|---|---|---|
| Value | 586 MPa (85 ksi) | 241 MPa (35 ksi) | 30% | 90 HRB |
Typical mill values exceed minimums: bar 690 MPa tensile, tubing 772 MPa. Charpy keyhole impact at –196°C: 91 J (longitudinal), confirming cryogenic toughness. Long-term service above approximately 540°C may reduce ductility due to microstructural changes.
Incoloy 825 Equivalent Grades
Incoloy 825 standard equivalent designation is UNS N08825, and its Werkstoff Nr. is 2.4858. Other international designations are covered in the table below:
| Property | UNS | Werkstoff Nr. | EN / DIN | AFNOR |
|---|---|---|---|---|
| Designation | N08825 | 2.4858 | NiFe30Cr21Mo3CuTi / 17751 | NC 20 D Nb |
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Types of Incoloy 825 Pipes & Fittings
At Nicorex Alloys, we stock the following types of Incoloy 825 pipes and fittings designed for sour gas tubing, acid processing piping, and seawater systems:
Incoloy 825 Seamless Pipe
Incoloy 825 Welded Pipe
Incoloy 825 Condenser Tube
Incoloy 825 ERW / EFW Pipe
Incoloy 825 Elbow (45° / 90° / 180°)
Incoloy 825 Tee (Equal / Reducing)
Incoloy 825 Reducer (Concentric / Eccentric)
Incoloy 825 Cap & Stub End
Industries Using Incoloy 825 Pipes & Fittings
Incoloy 825 pipes and fittings are specified for 7 key applications where piping must resist both reducing and oxidising acids:
- Chemical Processing: Reactor piping and transfer lines for sulfuric, phosphoric, and nitric acid environments. Heat exchanger tubing for acid coolers. Evaporator piping in chemical plants. Fittings connect reactor vessels, columns, and heat exchangers handling mixed acid streams.
- Oil & Gas / Sour Service: Sour gas gathering lines and production tubing (NACE MR-01-75 compliant). Downhole tubing in H₂S/CO₂/chloride environments. Flowlines and process piping in refineries handling sulfur-containing feeds.
- Pollution Control / FGD: FGD scrubber piping handling sulfur-containing flue gases. Acid-waste treatment piping. Incineration scrubber lines where mixed acid condensation occurs.
- Nuclear Fuel Reprocessing: Piping in fuel dissolvers handling mixed nitric/sulfuric acid. Radioactive waste systems.
- Acid Production: Phosphoric acid production piping (wet process). Sulfuric acid plant piping at various concentrations and temperatures. Pickling tank heating coils, baskets, and transfer lines in steel pickling operations.
- Marine & Offshore: Seawater-cooled heat exchanger tubes (ASTM B163). Offshore platform process piping. Subsea production systems where chloride SCC immunity is required.
- Power Generation: Power plant condenser tubing in freshwater and brackish water cooling circuits. Boiler feedwater heater piping. Geothermal plant piping handling hot, corrosive brines.
How to Order Incoloy 825 Pipes & Fittings from Nicorex Alloys
Provide the following details to place an order for Incoloy 825 pipes and fittings:
- Product Form — Seamless Pipe / Fittings (Elbow, Tee, Reducer, End Cap)
- Size — OD x WT or NPS x Schedule
- End Type — PE / BE / BW
- Material Grade — Incoloy 825 / UNS N08825 / W.Nr. 2.4858
- Quantity — Pieces or total weight in kg / MT
- Standard — ASTM B423 (pipe) / ASTM B366 (fittings), ASME B16.9
- Additional Requirements — NACE, PMI, stabilising anneal, IGC per ASTM A262 Practice E
- Documentation — MTC 3.1/3.2, PMI Report, IGC Report, TPI Certificate
- Packaging — VCI wrap, ISPM 15 compliant export crating
- Delivery — Domestic / International (specify destination)
We supply with full traceability and third-party inspection options.
Frequently Asked Questions
What ASTM Standard Covers Incoloy 825 Seamless Pipe?
ASTM B423 / ASME SB423 covers seamless pipe and tube for N08825. Welded pipe: B705. Condenser tube: B163. Fittings: B366 (buttweld WPNICMC).
Is Incoloy 825 Pipe NACE Compliant for Sour Service?
Yes. Listed in NACE MR-01-75 / ISO 15156 for H₂S environments. Seamless and welded forms approved in the annealed or stabilised condition.
What Welding Filler Metal is Used for Incoloy 825 Pipe?
ERNiCrMo-3 (FM 625) for GTAW. ENiCrMo-3 (Electrode 112) for SMAW. INCO-WELD 686CPT for the highest corrosion resistance. No preheat; interpass ≤150°C.
How Does Incoloy 825 Compare to Inconel 625 for Pipe Applications?
825 (42% Ni) offers dual acid resistance at moderate temperatures up to 540°C and a lower cost. 625 (62% Ni) provides higher tensile (827 vs 586 MPa), wider temperature range (to 982°C), and superior marine/pitting resistance (9% Mo). Choose 825 for acid service at moderate temperatures; 625 for higher strength or severe chloride environments.
What Pipe Schedules are Available for Incoloy 825?
SCH 5S through XXS. Commonly stocked schedules at Nicorex Alloys include SCH 10S, 40S, 40, 80S, 80, 120, 160, XXS. Custom wall thicknesses can be provided on request.
Does Incoloy 825 Pipe Resist Sulfuric Acid?
Yes. The combination of nickel, molybdenum, and copper gives superior resistance to sulfuric acid across a broad range of concentrations and temperatures, subject to service conditions. Used in H₂SO₄ piping, pickling tank coils, and chemical processing equipment.