Incoloy 825 tubing is a nickel-iron-chromium alloy with additions of molybdenum, copper, and titanium. It is known for its excellent corrosion resistance 1 in a wide range of aggressive environments. Tubing made from Incoloy 825 is particularly valuable due to its ability to withstand harsh conditions while providing a reliable conduit for fluids or gases.
What is Incoloy 825 material?
Incoloy 825 (UNS N08825) – Overview
Incoloy 825 is a nickel-iron-chromium alloy with significant additions of molybdenum, copper, and titanium. It is designed for exceptional resistance to corrosion, particularly in acidic and high-temperature environments. This alloy is widely used in industries requiring protection against pitting, crevice corrosion, stress corrosion cracking (SCC), and oxidation.
Key Properties of Incoloy 825:
✔ Superior Corrosion Resistance – Excellent resistance to sulfuric acid, phosphoric acid, nitric acid, and organic acids.
✔ High-Temperature Strength – Can withstand temperatures up to 540°C (1000°F).
✔ Resistant to Stress Corrosion Cracking (SCC) – Performs well in chloride and acidic conditions.
✔ Good Weldability – Can be welded using standard welding techniques.
✔ Oxidation Resistance – Maintains structural integrity in oxidizing and reducing environments.
Is alloy 825 stainless steel?
Alloy 825 is a nickel-based alloy, which means that the largest element present is nickel at 38-46% of the total. It also contains iron, chromium and molybdenum, but at lower proportions.
A stainless steel is a type of steel that resists corrosion. The composition of a steel product is based upon iron, and a stainless steel needs at least 11.5% chromium in order to resist general corrosion. Increasing the level of chromium will increase the resistance to corrosion, whilst additions of nickel, molybdenum and other elements will improve mechanical properties and corrosion resistance further.
Why is Alloy 825 Not Considered Stainless Steel?
Higher Nickel Content – Stainless steels have lower nickel content (typically 10-25%), whereas Alloy 825 has 38-46% nickel, classifying it as a nickel-based alloy.
Superior Corrosion Resistance – Alloy 825 resists strong acids, chloride stress corrosion cracking, and seawater, far better than most stainless steels.
Different Industry Use – Stainless steels are used in general structural and industrial applications, while Alloy 825 is used in extreme environments (chemicals, acids, and high heat).
Nickel Alloy 825 Tubing Material Specification
| Standard | ASTM, AISI, GB, JIS, customers’ requests available |
| Size | Round Tube: OD: 16-119mm or customized |
| Thickness | 0.25mm-3.0mm |
| Length | 6m or according to customers’ request |
| Tolerance | Outer diameter: ±0.2mm |
| Thickness: ±0.05mm | |
| Length: ±0.5mm | |
| Ends | In plain end or bevelled ends or as your requirements |
| Welding Line Type | ERW (Electrical Resistance Weld) |
| Form | ‘U’ bent, Hollow, Hydraulic, LSAW, Boiler, Straight Tube, Tube Coil, Round, Rectangular, Square Etc |
| End | Plain End, Beveled End, Treaded Tube |
| Value Added Service | Draw & Expansion as per required Size & Length, Polish (Electro & Commercial) Annealed & Pickled Bending, Machining Etc. |
| Length | 6m or according to customer’s request |
| Process method | Code drawn, annealed with nitrogen protection, ultrasonic, automatic shape, polished |
Chemical Composition of Incoloy Alloy 825 Tube
| Grade | C | Mn | Si | S | Cu | Fe | Ni | Cr | Al | Ti |
| Incoloy 825 | 0.05 max | 1.00 max | 0.05 max | 0.03 max | 1.50 – 3.00 | 22.00 min | 38.00 – 46.00 | 19.50 – 23.50 | 0.02 max | 0.06 – 1.20 |
Nickel Alloy 825 Tube Mechanical Properties
| Element | Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 825 | 8.14 g/cm3 | 1400 °C (2550 °F) | Psi – 80,000 , MPa – 550 | Psi – 32,000 , MPa – 220 | 30% |
Inconel 825 Tube Equivalent
| STANDARD | WERKSTOFF NR. | UNS | JIS | BS | GOST | AFNOR | EN | OR |
| Incoloy 825 | 2.4858 | N08825 | NCF 825 | NA 16 | ЭП703 | NFE30C20DUM | NiCr21Mo | XH38BT |
What is the difference between Incoloy 825 and ss316?
1. Chemical Composition
| Element | Incoloy 825 (UNS N08825) | SS316 (UNS S31600) |
| Nickel (Ni) | 38.0 – 46.0% | 10.0 – 14.0% |
| Iron (Fe) | Balance | Balance |
| Chromium (Cr) | 19.5 – 23.5% | 16.0 – 18.0% |
| Molybdenum (Mo) | 2.5 – 3.5% | 2.0 – 3.0% |
| Copper (Cu) | 1.5 – 3.0% | – |
| Titanium (Ti) | 0.6 – 1.2% | – |
| Carbon (C) | ≤ 0.05% | ≤ 0.08% |
Key Difference: Incoloy 825 has a higher nickel content, along with copper and titanium, which SS316 lacks.
2. Corrosion Resistance
Incoloy 825 is a nickel-iron-chromium alloy with additional molybdenum, copper, and titanium. It resists various corrosive media such as sulfuric acid, phosphoric acid, and seawater. Moreover, it is resistant to stress corrosion cracking and pitting corrosion. On the other hand, SS316 is a stainless steel alloy containing molybdenum, enhancing its corrosion resistance. It is particularly suited for applications involving acetic acid, sulfuric acid, and hydrochloric acid. However, it is vulnerable to pitting corrosion in chloride environments.
3. Strength & Temperature Resistance
| Property | Incoloy 825 | SS316 |
| Tensile Strength | 585 MPa | 515 MPa |
| Yield Strength | 220 MPa | 205 MPa |
| Melting Point | 1370–1400°C | 1375–1400°C |
| Max Service Temperature | 540°C (1000°F) | Approx. 870°C (1600°F) in dry air |
Key Difference: Incoloy 825 is stronger and performs better in extreme chemical conditions, while SS316 handles higher dry-air temperatures better.
4.Which One Should You Choose?
✅ Choose Incoloy 825 if you need:
✔ Superior corrosion resistance (especially in acidic and chloride-rich environments)
✔ High strength and stress corrosion cracking resistance
✔ Performance in aggressive chemical processing, marine, or oil & gas industries
✅ Choose SS316 if you need:
✔ Good corrosion resistance for general applications
✔ Easier welding, machining, and fabrication
✔ A cost-effective material for standard marine, food, and pharmaceutical industries
UNS N08825 Pipe and Tube Dimension
| NOTE 1—The decimal thickness listed for the respective pipe sizes represents their nominal or average wall dimensions. | ||||||||||
| NPS | Outside Diameter | Nominal Wall Thickness | ||||||||
| Designator | in. | mm | Schedule 5SA | Schedule 10SA | Schedule 40S | Schedule 80S | ||||
| in. | mm | in. | mm | in. | mm | in. | mm | |||
| 1/8 | 0.405 | 10.29 | 0.049 | 1.24 | 0.068 | 1.73 | 0.095 | 2.41 | ||
| 1/4 | 0.540 | 13.72 | 0.065 | 1.65 | 0.088 | 2.24 | 0.119 | 3.02 | ||
| 3/8 | 0.675 | 17.15 | 0.065 | 1.65 | 0.091 | 2.31 | 0.126 | 3.20 | ||
| 1/2 | 0.840 | 21.34 | 0.065 | 1.65 | 0.083 | 2.11 | 0.109 | 2.77 | 0.147 | 3.73 |
| 3/4 | 1.050 | 26.67 | 0.065 | 1.65 | 0.083 | 2.11 | 0.113 | 2.87 | 0.154 | 3.91 |
| 1 | 1.315 | 33.40 | 0.065 | 1.65 | 0.109 | 2.77 | 0.133 | 3.38 | 0.179 | 4.55 |
| 1 1/4 | 1.660 | 42.16 | 0.065 | 1.65 | 0.109 | 2.77 | 0.140 | 3.56 | 0.191 | 4.85 |
| 1 1/2 | 1.900 | 48.26 | 0.065 | 1.65 | 0.109 | 2.77 | 0.145 | 3.68 | 0.200 | 5.08 |
| 2 | 2.375 | 60.33 | 0.065 | 1.65 | 0.100 | 2.77 | 0.154 | 3.91 | 0.218 | 5.54 |
| 2 1/2 | 2.875 | 73.03 | 0.083 | 2.11 | 0.120 | 3.05 | 0.203 | 5.16 | 0.276 | 7.01 |
| 3 | 3.500 | 88.90 | 0.083 | 2.11 | 0.120 | 3.05 | 0.216 | 5.49 | 0.300 | 7.62 |
| 4 | 4.000 | 101.60 | 0.083 | 2.11 | 0.120 | 3.05 | 0.226 | 5.74 | 0.318 | 8.08 |
| 4 | 4.500 | 114.30 | 0.083 | 2.11 | 0.120 | 3.05 | 0.237 | 6.02 | 0.337 | 8.56 |
| 5 | 5.563 | 141.30 | 0.109 | 2.77 | 0.134 | 3.40 | 0.258 | 6.55 | 0.375 | 9.52 |
| 6 | 6.625 | 168.28 | 0.109 | 2.77 | 0.134 | 3.40 | 0.280 | 7.11 | 0.432 | 10.97 |
| 8 | 8.625 | 219.08 | 0.109 | 2.77 | 0.148 | 3.76 | 0.322 | 8.18 | 0.500 | 12.70 |
| 10 | 10.750 | 273.05 | 0.134 | 3.40 | 0.165 | 4.19 | 0.365 | 9.27 | 0.500B | 12.70B |
| 12 | 12.750 | 323.85 | 0.156 | 3.96 | 0.180 | 4.57 | 0.375B | 9.52B | 0.500B | 12.70B |
Nickel 825 Tubing Wall Thickness & Outer Diameter
| Types of Incoloy 825 Tube | Out diameter (OD) | Wall thickness | Length |
| NB Sizes (in stock) | 1/8” ~ 8” | SCH 5 / SCH 10 / SCH 40 / SCH 80 / SCH 160 | Upto 6 Meters |
| Incoloy 825 Seamless Tube (Custom Sizes) | 5.0mm ~ 203.2mm | As per requirement | Upto 6 Meters |
| Incoloy 825 Welded Tube (in Stock + Custom Sizes) | 5.0mm ~ 1219.2mm | 1.0 ~ 15.0 mm | Upto 6 Meters |
Is Inconel and Incoloy the same?
No, Inconel and Incoloy are not the same. While both are nickel-based alloys produced by Special Metals Corporation, they have distinct compositions, properties, and applications.
| Feature | Inconel | Incoloy |
| Nickel Content | High (50-72%) | Lower (30-46%) |
| Main Alloying Elements | Nickel, Chromium, Molybdenum | Nickel, Iron, Chromium |
| Temperature Resistance | Excellent (High-Temperature Strength, up to 1200°C) | Good (Moderate-Temperature Performance, up to 540°C) |
| Corrosion Resistance | Superior in extreme environments (oxidation, acids, seawater, high heat) | Good resistance to general corrosion and oxidation |
| Strength | Higher tensile and creep strength | Moderate strength |
| Typical Applications | Aerospace, gas turbines, nuclear reactors, heat exchangers | Chemical processing, marine applications, pipelines |
When to Use Inconel vs. Incoloy?
✅ Use Inconel if you need:
✔ Extreme heat resistance (e.g., aerospace, jet engines, heat exchangers)
✔ Superior corrosion resistance (e.g., seawater, nuclear, and chemical plants)
✔ High strength in aggressive environments
✅ Use Incoloy if you need:
✔ Good corrosion resistance at moderate temperatures
✔ More cost-effective alternative to Inconel
✔ Strong material for chemical and marine applications
Incoloy 825 Material Testing
Flattening Test
Pitting Resistance Test
Intergranular Corrosion (IGC) Test
Mechanical Testing Such as Tensile of Area
Positive Material Identification – PMI Testing
Hardness Test
Micro and MacroTest
Chemical Analysis – Spectro Analysis
Flaring Test
What is Incoloy used for?
1. Chemical Processing Industry 🏭
✔ Used in heat exchangers, piping, reactors, and tanks
✔ Resists sulfuric acid, phosphoric acid, and nitric acid
✔ Handles highly corrosive solutions
2. Marine & Offshore Industries 🌊
✔ Piping and heat exchangers in seawater environments
✔ Offshore oil platforms and shipbuilding
✔ Resistant to chloride stress corrosion cracking
3. Oil & Gas Industry ⛽
✔ Used in downhole tubing, sour gas pipelines, and wellhead components
✔ Withstands high-pressure, high-temperature (HPHT) environments
✔ Excellent resistance to sulfur-containing environments
4. Power Generation & Nuclear Industry⚡
✔ Components in nuclear reactors, steam generators, and boiler tubing
✔ Handles radiation and extreme thermal conditions
✔ Maintains mechanical strength in high temperatures
5. Aerospace & Automotive ✈🚗
✔ Jet engine exhaust systems and heat shields
✔ Turbocharger components in performance vehicles
✔ Resists oxidation and carburization at high temperatures
6. Pollution Control & Environmental Protection 🌿
✔ Used in scrubber systems, flue-gas desulfurization (FGD) units, and ducting
✔ Withstands acidic and high-temperature gases
Incoloy 825 Products
Steel Sheet
Steel Plate
Bars
Pipe & Tube (welded & seamless)
Pipe Fittings
Elbows, tees, stub-ends, returns, caps, crosses, reducers, pipe nipples. etc.
You can get an offer for products in below material forms:
-Pipe and Tube (EN 10216-5, ASTM A213, ASTM A249, A312, A790,)
-Forged Fitting and Flange (ASTM A182 , ASTM A105,ASTM B564 )
-Butt Weld Fittings (ASTM A234, ASTM A403,ASTM A815)
-Round bar , Billet (ASTM A276, ASTM A479)
– Plate, Sheet, Strip(ASTM A240, EN 10028-7, A480)
-Bolting, Nuts（ASTM A193, A194, A320）
Incoloy 825 Tubing Exported Countries
We Export Incoloy 825 Tubing to Saudi Arabia, United Arab Emirates, Qatar, Bahrain, Oman, Kuwait, Turkey, Egypt, Yemen , Syria, Jordan, Cyprus, Singapore, Malaysia, Indonesia, Thailand, Vietnam, South Korea, Japan, Sri Lanka, Maldives, Bangladesh, Cambodia, Argentina, Bolivia, Brazil, Venezuela, Colombia, Ecuador, Guyana, Paraguay, Uruguay, United States Of America, Canada, Mexico, Panama, Jamaica, Bahamas, Denmark, Norway, Germany, France,Italy, United Kingdom, Spain, Belgium, Greece, Czech Republic, Portugal, Hungary, Albania, Austria, Finland, Ireland, Croatia, Malta, Nigeria, Algeria, Angola, South Africa, Libya, Egypt, Sudan, Europe, Africa, Asia, North America, South America, Middle East.etc