Incoloy 825 welded pipe is a widely used nickel-iron-chromium alloy. Its United Nations (UNS) designation is N08825, and its German standard is 2.4858. It is renowned for its excellent resistance to a wide range of acids (both oxidizing and reducing) and chloride stress corrosion cracking. Available in both seamless and welded versions, and conforming to standards such as ASTM B423, Incoloy 825 pipe is widely used in demanding applications such as chemical processing, oil and gas recovery, and nuclear fuel reprocessing due to its high mechanical strength and thermal stability.
What is Incoloy 825 alloy made of?
Inconel 825 is a nickel-iron-chromium alloy with the following chemical composition: nickel (Ni) 38.0-46.0%, iron (Fe) at least 22.0%, chromium (Cr) 19.5-23.5%, molybdenum (Mo) 2.5-3.5%, copper (Cu) 1.5-3.0%, and titanium (Ti) 0.6-1.2%. It also contains carbon (C) 0.05%, manganese (Mn) 1.0%, silicon (Si) 0.5%, aluminum (Al) 0.2%, and sulfur (S) 0.03%.
Standard Specification of Incoloy 825 Tube
| Thickness | 0.3mm – 50 mm, SCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXS, SCH XS |
| Outer Diameter | 6.00 mm OD up to 914.4 mm OD, Sizes up to 24" NB |
| Type | Seamless / ERW / Welded / Fabricated / CDW |
| Form | Round Tubes, Square Tubes, Rectangular Tubes, Coiled Tubes, "U" Shape, Pan Cake Coils, Hydraulic Tubes |
| Length | Single Random, Double Random & Required Length |
| End | Plain End, Beveled End, Treaded. |
Incoloy alloy 825 Seamless Tube Size Range
Incoloy alloy 825 ERW Tubes : 1/2″ NB – 24″ NB
Nickel Alloy 825 Seamless Pipe : 1/2″ NB – 16″ NB
Incoloy 825 UNS N08825 EFW Pipe : 6″ NB – 100″ NB
Incoloy 825 din 2.4858 Tubes : 1/8″NB TO 30″NB IN
Chemical Equation of Nickel Alloy 825 Tubing
| Grade | C | Mn | Si | Fe | S | Cr | Cu | Ti | |
| 825 | min. | – | – | – | 22.0 | – | 19.5 | 1.5 | 0.6 |
| max. | 0.05 | 1.0 | 0.5 | – | 0.015 | 23.5 | 3.0 | 1.2 | |
Mechanical Characteristics of Nickel 825 Welded Tube
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness | |
| Rockwell B (HR B) max | Brinell (HB) max | ||||
| 825 | Psi - 80,000 , MPa - 550 | Psi - 32,000 , MPa -220 | 30 | – | – |
Equivalent Material of Incoloy 825 UNS N08825 seamless Tube
| Grade | UNS No | Old British | Euronorm | GOST | Japanese JIS | ||
| BS | En | No | AFNOR | ||||
| Incoloy 825 | N08825 | NA 16 | NiCr21Mo | 2.4858 | NFE30C20DUM | --703 | NCF 825 |
UNS N08825 seamless Tube Key Properties:
Corrosion Resistance: Excellent resistance to a wide range of acids (sulfuric acid, phosphoric acid, nitric acid) and alkalis in both oxidizing and reducing environments.
Stress Corrosion Cracking Resistance: The high nickel content makes it resistant to chloride-induced stress corrosion cracking.
Pitting and Crevice Corrosion: Due to its molybdenum content, it resists localized attack such as pitting and crevice corrosion.
Mechanical Properties: It exhibits good high-temperature strength, ductility, and tensile strength, and maintains its austenitic structure at high temperatures.
Weldability and Formability: The alloy is easily welded and fabricated, making it suitable for a variety of manufacturing processes.
UNS N08825 seamless Tube Applications:
Chemical Processing: Used in equipment handling sulfuric acid, nitric acid, and other corrosive chemicals.
Oil and Gas Recovery: Its high strength and corrosion resistance make it suitable for oil and gas well piping.
Nuclear Industry: Used in nuclear fuel reprocessing and applications involving radioactive waste.
Pollution Control: Due to its durability, it can be used in various pollution control equipment.
Marine and Other Applications: It is also used in ship exhaust systems and food/water heating vessels.
Gnee Steel specializes in the production and sale of various nickel-based alloys, including Nickel 201, Nickel 202, Hastelloy C-276, Hastelloy C-22, Hastelloy B, Hastelloy C-4, Inconel Alloy 600, Inconel 625, Inconel 718, Inconel X-750, Incoloy Alloy 800, Incoloy 800H/HT, Incoloy 825, Monel Alloy 400, Monel K500, and high-temperature alloys. Gnee Steel's products are widely used in aerospace, chemical, electric power, automotive, and nuclear energy applications, and we can provide customized alloy solutions tailored to customer needs. For alloy pricing inquiries or customized alloy solutions, please contact us for a quote at ss@gneemetal.com.
