Incoloy 825 Pipe Fittings Manufacturer & Supplier from Mumbai
We got a call last month from a plant engineer who’d just watched a batch of stainless fittings fail in under two years on a sulfuric acid line. That’s usually how the Incoloy 825 conversation starts — after something cheaper has already let someone down. It’s not the least expensive nickel alloy around, but for sulfuric and phosphoric acid service, chloride-heavy seawater, or sour gas with H2S in the mix, it holds up where plain stainless just doesn’t. Kalpataru Piping Solution keeps Incoloy 825 pipe fittings (UNS N08825, Werkstoff 2.4858) in stock at our Mumbai facility, made to ASTM B366 and dimensioned to ASME B16.9 and B16.11. We also stock Incoloy 825 flanges and Incoloy 825 tube fittings so you’re not stitching a piping package together from three different mill certificates. The molybdenum and copper in the alloy are doing the actual work against acid attack; the titanium is there so welding doesn’t sensitise the material later, which is the kind of detail a lot of spec sheets skip over. Elbows, tees, reducers, stub ends — we hold these from 1/2″ to 48″ NB, every batch backed by EN 10204 3.1 paperwork, with NACE MR0175 sorted out when sour service calls for it. Got a BOM for an acid plant or a sour-gas line? Send it over and we’ll quote the actual grade you need, not a guess.
- What Is Incoloy 825, and Why Does It Cost More Than Stainless?
- Which Fittings Do We Actually Keep in Stock?
- Incoloy 825 Pipe Fittings Specification
- Types of Incoloy 825 Pipe Fittings
- Incoloy 825 Pipe Fittings Chemical Composition (%)
- Incoloy 825 Pipe Fittings Mechanical Properties
- Incoloy 825 Pipe Fittings Equivalent Grade
- 90° Elbow Dimensions (ASME B16.9, Select Sizes)
- Where Does This Alloy Actually Earn Its Keep?
- Incoloy 825 vs Inconel 625 vs Incoloy 800: How Do You Actually Pick?
- What Happens Before a Fitting Actually Ships?
- What Should You Budget For?
- Frequently Asked Questions – Incoloy 825 Pipe Fittings
What Is Incoloy 825, and Why Does It Cost More Than Stainless?
Incoloy 825 is a nickel-iron-chromium alloy, but the numbers that actually matter are the additions: 2.5–3.5% molybdenum and 1.5–3.0% copper, both put there specifically to fight two of the most economically damaging corrosion problems in industrial piping sulfuric acid and phosphoric acid attack. Titanium stabilisation on top of that keeps the alloy resistant to intergranular corrosion after welding, which is the failure mode that quietly ruins a lot of cheaper stainless installations a few years down the line. It’s not the highest-performance nickel alloy available Inconel 625 pipe fittings beat it on raw temperature and corrosion resistance but for acid service specifically, 825 is usually the more sensible spend. Compared to general-purpose Incoloy 800 pipe fittings, 825’s copper and molybdenum additions are the whole reason it costs more you’re paying specifically for acid resistance that 800 doesn’t have.
Which Fittings Do We Actually Keep in Stock?
- 90° & 45° elbows (long radius and short radius)
- 180° return bends
- equal and reducing tees
- concentric and eccentric reducers
- stub ends (long and short pattern)
- end caps
- equal and unequal crosses
- socket-weld and threaded fittings — couplings, unions, nipples, bushings
If your project also calls for matching material in other forms, we stock Incoloy 825 flanges, Incoloy 825 tube fittings, Incoloy 825 tubes, and Incoloy 825 valves — all from the same mill lineage, so your documentation doesn’t end up scattered across three vendors.
Incoloy 825 Pipe Fittings Specification
Parameter | Details |
|---|---|
Governing Specification | ASTM B366 / ASME SB366 |
UNS No. | N08825 |
Werkstoff No. | 2.4858 |
Size Range | 1/2″ NB to 48″ NB |
Schedules | SCH 10 to XXS |
Dimensional Standards | ASME B16.9, ASME B16.11, MSS SP-43 |
Construction | Seamless & Welded |
End Finish | BE, PE, TE |
Certification | EN 10204 3.1, NACE MR0175 on request |
Incoloy 825 Pipe Fittings Chemical Composition (%)
Element | Range |
|---|---|
Nickel (Ni) | 38 – 46 |
Chromium (Cr) | 19.5 – 23.5 |
Molybdenum (Mo) | 2.5 – 3.5 |
Copper (Cu) | 1.5 – 3.0 |
Titanium (Ti) | 0.6 – 1.2 |
Carbon (C, max) | 0.05 |
Iron (Fe) | Balance |
Incoloy 825 Pipe Fittings Mechanical Properties
Property | Value |
|---|---|
Tensile Strength (min) | 586 MPa (85,000 psi) |
0.2% Yield Strength (min) | 241 MPa (35,000 psi) |
Elongation (min) | 30% |
Hardness (max) | Rb 100 |
Density | 8.14 g/cm³ |
Melting Point | 1370 – 1400°C (2500 – 2550°F) |
Incoloy 825 Pipe Fittings Equivalent Grade
| UNS | Werkstoff Nr. | BS | Common Name |
|---|---|---|---|
| N08825 | 2.4858 | NA 16 / NA 21 | Incoloy 825 / Alloy 825 |
90° Elbow Dimensions (ASME B16.9, Select Sizes)
NPS (inch) | O.D. (mm) | 90° LR Elbow C-to-F (in) | 45° LR Elbow C-to-F (in) | 180° Return C-to-C (in) |
|---|---|---|---|---|
1/2 | 21.3 | 1 1/2 | 5/8 | 2 |
1 | 33.4 | 1 1/2 | 7/8 | 3 |
2 | 60.3 | 3 | 1 3/8 | 6 |
4 | 114.3 | 6 | 2 1/2 | 12 |
6 | 168.3 | 9 | 3 3/4 | 18 |
8 | 219.1 | 12 | 5 | 24 |
12 | 323.9 | 18 | 7 1/2 | 36 |
Approximate Weight — Schedule 40S (kg per piece)
DN | 90° Elbow | 45° Elbow | Equal Tee |
|---|---|---|---|
15 | 0.08 | 0.04 | 0.10 |
25 | 0.15 | 0.11 | 0.29 |
40 | 0.40 | 0.23 | 0.86 |
50 | 0.70 | 0.40 | 1.28 |
80 | 2.20 | 1.08 | 3.31 |
100 | 4.47 | 2.09 | 5.27 |
150 | 10.89 | 5.44 | 10.99 |
200 | 21.54 | 10.77 | 20.91 |
300 | 59.42 | 29.71 | 62.14 |
Incoloy Alloy 825 Pipe Fittings Types
Where Does This Alloy Actually Earn Its Keep?
- sulfuric acid plants — alkylation unit piping, acid cooler headers, absorption tower connections
- phosphoric acid manufacturing — reactor connections, heat exchanger piping, filtrate handling
- marine and offshore — seawater piping, flue gas scrubbers, desalination plant connections
- oil and gas production — sour gas processing, well-completion piping, NACE MR0175 gas treatment
- pollution control — flue gas desulfurisation (FGD) scrubber piping, SO2 scrubber headers
If your service is more about raw temperature or extreme chloride exposure than acid attack specifically, it’s worth comparing against Inconel 625 pipe fittings — a step up in both performance and price. And if the corrosion concern is more general oxidising service without the acid component, Incoloy 800 pipe fittings is often the more economical choice.
Incoloy 825 vs Inconel 625 vs Incoloy 800: How Do You Actually Pick?
This is the question that comes up most, so here it is straight rather than buried in a spec sheet:
Property | Incoloy 825 | Inconel 625 | Incoloy 800 |
|---|---|---|---|
Base Composition | Ni-Fe-Cr + Mo + Cu | Ni-Cr-Mo | Ni-Fe-Cr |
Acid Resistance | Excellent (sulfuric, phosphoric) | Good, but overkill for pure acid duty | Limited |
Temperature Resistance | Moderate (to ~538°C) | Very high (to ~1000°C+) | Good (to ~800°C) |
Relative Cost | Moderate | High | Lower |
Typical Use | Chemical processing, marine, sour gas | Aerospace, extreme service | Furnace, heat-treatment equipment |
What Happens Before a Fitting Actually Ships?
- ISO 9001:2015 — Quality Management
- ASTM B366 / ASME SB366 — Manufacturing Standard
- ASME B16.9 & B16.11 — Dimensional Standards
- NACE MR0175 / ISO 15156 — Sour Service Compliance
- EN 10204 3.1 — Mill Test Certification
What Should You Budget For?
Pricing on Incoloy 825 Pipe Fittings moves with size, schedule, seamless-versus-welded construction, and whether NACE or third-party inspection is specified. As a rough anchor, a 2″ SCH 40 90° elbow typically runs in a moderate mid-range bracket compared to standard stainless — expect a meaningful premium over 316L given the nickel and molybdenum content, but well below Inconel 625 pricing for the same size. We quote ex-Mumbai in both INR and USD, and can turn around a firm quote same-day once we have your size list.
Frequently Asked Questions – Incoloy 825 Pipe Fittings
Incoloy 825 (UNS N08825) is a nickel-iron-chromium alloy with added molybdenum and copper, designed for excellent corrosion resistance in acidic environments. “Inconel 825” is often a misnomer — the correct designation is Incoloy 825. Inconel alloys generally have higher nickel content and are used for high-temperature applications.
Incoloy 825 pipe fittings are manufactured as per ASTM B366, which covers factory-made wrought nickel and nickel alloy buttweld fittings. These fittings comply with ASME B16.9 dimensional standards.
Incoloy 825 pipe fittings can typically be used in temperatures up to 540°C (1000°F) depending on the application environment. It performs exceptionally well in both oxidizing and reducing conditions.
Yes, Incoloy 825 offers excellent resistance to chloride-induced stress corrosion cracking, making it suitable for marine and seawater environments, including offshore platforms and desalination plants.
Yes, Kalpataru Piping Solution supplies NACE MR0175 / ISO 15156 compliant Incoloy 825 pipe fittings for sour service applications in oil and gas industries.
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