INCOLOY® 825 (UNS N08825, W.Nr. 2.4858) is a registered trademark of Special Metals Corporation of the United States. It is a classic nickel‑iron‑chromium alloy with additions of molybdenum, copper and titanium.
It delivers outstanding corrosion resistance in both oxidizing and reducing environments. It offers particularly good resistance to sulfuric acid, phosphoric acid, and stress‑corrosion cracking (SCC) in chloride‑containing media.
Many buyers encounter this common issue when receiving engineering drawings:
The drawing specifies INCOLOY 825, while suppliers submit quotations referencing Alloy 825, UNS N08825 or W.Nr. 2.4858. Are these designations referring to the same material?
Yes. These are merely different designations for the same material under various standard systems. Nevertheless, always verify the chemical composition and mechanical properties shown on the material test certificate to prevent some manufacturers from substituting approximate grades.
Send us your drawings, and our nickel‑alloy engineers will check grade compatibility for free and provide you with an official quotation for INCOLOY 825 promptly.
Submit Your Drawing For Review
INCOLOY 825 / Alloy 825 Grade Designations by Region & Standard
Interchangeable Equivalent Grades：
These grades comply with matching chemical composition, mechanical property and heat‑treatment requirements. They are accepted for direct substitution in most international projects, subject to project‑spec document review.
| Region | Standard System | Grade / Designation | Main Product Specifications | Key Note |
|---|---|---|---|---|
| USA | ASTM / UNS | UNS N08825 (Incoloy 825) | ASTM B423(tube), B424(sheet/plate), B425(bar) | Base reference grade; NACE MR0175 / ISO 15156 approved for sour‑gas service |
| Europe | EN / DIN | W.Nr. 2.4858, NiCr21Mo | EN 10095 | Widely accepted for EU & global export projects |
| United Kingdom | BS | NA 16 | BS 3076 | Legacy British designation for 2.4858 |
| Japan | JIS | NCF 825 | JIS G4901 / G4902 | For Japanese‑origin equipment drawings |
| China | GB/T 15007 | NS1402(NS142, 0Cr21Ni42Mo3Cu2Ti) | GB/T 15007 | Fully chemistry‑matched; confirm 3.2 certificate for overseas tender |
| Russia | GOST | ЭП703 | GOST wrought nickel‑alloy standard | For CIS / Russian domestic projects |
Approximate Alternative Grades (Not Direct Replacement)：
These alloys share partial corrosion‑resistance performance, but have deviations in nickel, molybdenum, copper or titanium. They CANNOT replace Incoloy 825 if your drawing explicitly specifies Incoloy 825 / UNS N08825. Only evaluate for non‑critical, mild‑corrosion conditions with client written approval.
| Grade | Why it is not full equivalent | Risk if forced substitution |
|---|---|---|
| Alloy 904L | Super‑austenitic stainless steel, lower nickel, no titanium stabilization | Poor stress‑corrosion‑cracking resistance in chloride‑rich sour environments; fail in sulfuric‑acid service |
| Incoloy 800 / 800H | Focused on high‑temperature creep strength; lower molybdenum‑copper | Poor resistance to reducing acids (sulfuric, phosphoric) |
| Alloy 20 | Good sulfuric‑acid resistance but different Ti‑stabilization & Ni balance | Different inter‑granular corrosion behaviour after welding |
| 2205 Duplex | Lower nickel content; strength‑oriented duplex stainless | Not fit for reducing‑acid medium |
Common Procurement Pitfalls When Substituting Equivalent Alloy 825：
- Certificate requirement for export orders: Overseas end‑users mostly require MTC marked UNS N08825. Marking only NS142 or 2.4858 alone may be rejected in oil‑gas / international chemical projects. EN 10204 3.1 / 3.2 inspection certificate is strongly recommended.
- Trace element tolerance differences: Different standards allow minor deviation for S, C, Ti. Low‑sulfur heat is preferred for pickling & heavy‑welding fabrications. High carbon heats increase risk of inter‑granular corrosion after welding.
- NACE sour‑gas limitation: Only heats certified UNS N08825 in solution‑annealed condition satisfy NACE MR0175. Do not rely solely on trade‑name equivalent labels.
- NS142 domestic vs export: Domestic NS142 can match UNS N08825; always ask mill to certify compliance to UNS N08825 for cross‑border shipment.
- PMI inspection: Third‑party PMI spot‑check is standard practice for nickel‑alloy incoming‑material QC; ensure every equivalent grade batch passes PMI verification.
INCOLOY 825 / Alloy 825 Common ASTM / ASME Product Specifications
- Seamless Pipe & Tube: ASTM B163, ASTM B423, ASTM B704
- Welded Pipe & Tube: ASTM B704, ASTM B705
- Plate, Sheet & Strip: ASTM B424
- Rod & Bar: ASTM B425
- Fittings & Forgings: ASTM B564
INCOLOY 825 Availability：
Alloy 825 is available in Sheet, Plate, Strip, Pipe, Tube, Rod, Round Bar, Flat Bar, Hexagon, Wire and Forging Stock. View Stock List, Plate Stock List or contact Sales for further availability.
Incoloy 825 / UNS N08825：Chemical Composition
| andard | Grade | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chemical composition % | |||||||||||||
| Fe: | Ni: | Cr: | Mo: | Cu: | Ti: | Mn: | Al: | C: | S: | P: | Uwagi: | ||
| ASTM, UNS | Alloy 825, N08825, Incoloy 825 | ||||||||||||
| Balance | 38.0-46.0 | 19.5-23.5 | 2.5-3.5 | 1.5-3.0 | 0.6-1.2 | <1.0 | <0.2 | <0.05 | <0.03 | <0.03 | <0.01 | ||
| DIN | NiCr21Mo, 2.4858 | ||||||||||||
| Balance | 38.0-46.0 | 19.5-23.5 | 2.5-3.5 | 1.5-3.0 | 0.6-1.2 | <1.0 | <0.2 | <0.025 | <0.015 | <0.02 | Co: <1.0; Si: <0.5 | ||
| BS | NA 16 | ||||||||||||
| Balance | 38.0-46.0 | 19.5-23.5 | 2.5-3.5 | 1.5-3.0 | 0.6-1.2 | <1.0 | <0.2 | <0.05 | <0.03 | - | Ni: Ni + Co; Si: <0.5 | ||
| GB/T | NS142 | ||||||||||||
| Reszta | 38.0-46.0 | 19.5-23.5 | 2.5-3.5 | 1.5-3.0 | 0.6-1.2 | <1.0 | <0.2 | <0.05 | <0.03 | <0.03 | Si: <0.5 | ||
| GOST | 02Ch21N42M3 | ||||||||||||
| Reszta | 42.0 | 21.0 | 3.0 | - | - | - | - | 0.02 | - | - | - | ||
| ISO | NiFe30Cr21Mo3 | ||||||||||||
| Balance | 38.0-46.0 | 19.5-23.5 | 2.5-3.5 | 1.5-3.0 | 0.6-1.2 | <1.0 | <0.2 | <0.05 | <0.03 | <0.03 | ET: <0.5; Ni: Ni + Co; Si: <0.05 | ||
Incoloy 825 / UNS N08825： Typical Mechanical Properties
| Material | Form and Condition | Tensile Strength MPa | Yield Strength (0.2% Offset) MPa | Elongation (%) |
| Alloy 825 Tube | Annealed | 772 | 441 | 36 |
| Alloy 825 Tube | Cold Drawn | 1000 | 889 | 15 |
| Alloy 825 Bar | Annealed | 690 | 324 | 45 |
| Alloy 825 Plate | Annealed | 662 | 338 | 45 |
| Alloy 825 Sheet | Annealed | 758 | 421 | 39 |
Incoloy 825 / UNS N08825：Reference Price List (2026)
All values are for market reference only. Final unit price depends on LME nickel & molybdenum prices, order volume, certificate type (3.1/3.2), and cut‑to‑length requirements. Submit an inquiry for live quotations.
| Item | Tabulated Price Range |
|---|---|
| Hot‑rolled round bar Φ10‑200 mm, domestic material | 160‑230 CNY/kg |
| Medium & heavy plate 6‑50 mm | 170‑240 CNY/kg |
| Cold‑rolled thin sheet 0.5‑3 mm | 220‑300 CNY/kg |
| Seamless tube Φ19‑114 mm, wall thickness 1‑5 mm | 220‑320 CNY/kg |
| Ring & forgings, outer diameter ≤500 mm | 280‑350 CNY/kg |
| Large‑size forgings, outer diameter ＞1500 mm | 350‑420 CNY/kg |
| Imported VDM/ATI with 3.2 test certificate | 15‑30 % premium over domestic grade |
Note: For reference only. Actual prices vary with nickel‑raw‑material fluctuations, dimensions, quantity and certification requirements. Contact GNEE STEEL for up‑to‑date official quotation.
Incoloy 825 / UNS N08825 Applications
Incoloy 825 is used in the following applications:
- Oil & Gas: Sour‑service downhole components, wellhead parts, piping and heat exchangers (compliant with NACE MR0175)
- Chemical Processing: Heat exchangers, reactors & piping for sulfuric / phosphoric acid service
- Marine & Desalination: Seawater coolers, offshore platform equipment, desalination system parts
- Pollution Control (FGD): Scrubber internals, flue‑gas treatment equipment
- Pickling & Hydrometallurgy: Pickling racks, leaching‑process corrosion‑resistant components
- Nuclear & Special Process: Fuel reprocessing and aggressive‑medium handling equipment
How Does GNEE STEEL Help You Mitigate Procurement Risks?
As a long‑term nickel‑alloy supplier serving global chemical, environmental‑protection, power‑generation and offshore‑engineering projects, GNEE STEEL supplies not only Alloy 825 plates, but also the following offerings：
✅️Products complying with ASTM B424 / ASME SB424 standards
✅️EN 10204 3.1 material test certificates ‑ PMI positive‑material‑identification inspection
✅️Ultrasonic Testing (UT)
✅️One‑stop machining services including cutting, beveling, drilling and mechanical processing
✅️Third‑party inspection support by SGS, BV, TÜV
✅️Custom‑size supply to minimize processing waste
✅️Rich export experience to meet delivery requirements for worldwide projects
Contact GNEE STEEL for stock, machining options and quotations for INCOLOY 825 / UNS N08825 / W.Nr. 2.4858. Our engineers deliver cost‑optimized material recommendations based on your media, temperature and service conditions.
📦Packaging and Shipping
All Incoloy 825 products are packaged using the following methods:
Wooden pallets or crates
Moisture-proof packaging
Labels with furnace number, standard, and size labels
Shipped worldwide by sea, air, or express
Gnee Alloy Alloy 825 Product Packing
⚒️Gnee Alloy Production Line Equipment and Product Testing
Gnee Alloy Inconel 825 Product Testing And Production Equipment
Contact us for the latest export price quote for 825 Alloy
FAQ:
What is the difference between alloy 20 and INCOLOY 825?
Alloy 20 offers moderate strength, good ductility, and excellent weldability. It can be easily formed into pipes, sheets, and fittings, making it versatile for chemical processing equipment. Incoloy 825 provides higher tensile and yield strength, superior toughness, and excellent performance at elevated temperatures.
What is the difference between INCOLOY 825 and AISI 316?
In summary, both Incoloy 825 and SS316 are high-performance stainless steel alloys with broad applications. Incoloy 825 offers exceptional corrosion resistance, particularly in reducing environments, while SS316 excels in marine and chemical environments.
What is the difference between Inconel 925 and 825?
Alloy 825 (Incoloy 825, UNS N08825, 2.4858) and Alloy 925 (Incoloy 925, UNS N09925) are nearly identical in composition, and therefore provide very similar corrosion resistance and physical properties. However, Alloy 925 provides significantly higher levels of strength as it benefits from precipitation strengthening.
What is the difference between INCOLOY 800 and 825?
Incoloy 800 offers reliable high-temperature stability at a lower cost, making it suitable for applications where corrosion risk remains moderate. Incoloy 825, with its superior resistance to acids and chlorides, becomes the preferred choice for harsh chemical environments, even if it means a higher upfront expense.
What does INCOLOY mean?
Incoloy is a brand name for a group of metal mixes, called superalloys, made mostly of nickel, iron, and chromium. It is designed to stay strong and resist rust or damage in very hot places and harsh chemicals.
Does Inconel 825 rust?
The outstanding attribute of INCOLOY 825 is its high level of corrosion resistance. In both reducing and oxidize environments, the alloy resists general corrosion, pitting, crevice corrosion, intergranular corrosion, and stress-corrosion cracking.
