ASTM B444 UNS N06625 / Inconel 625 Grade 2 Nickel Alloy Seamless U-Tube
ASTM B444 UNS N06625 / Inconel 625 Grade 2 Nickel Alloy Seamless U-Tube
ASTM B444 UNS N06625 Inconel 625 Grade 2 Nickel Alloy Seamless U-Tubing is a high-strength, corrosion-resistant nickel-base alloy manufactured seamlessly to ASTM B444 and supplied in the solution annealed condition (Grade 2). This material resists a wide range of corrosive conditions, exhibits high fatigue strength, and has excellent toughness, making it an ideal choice for high-temperature and high-pressure applications in chemical processing, aerospace, and marine environments.
What is the ASTM standard for Inconel 625 pipe?
Nickel-based Inconel 625 pipe conforming to ASTM B444 is cold-worked seamless structural pipe. UNS N06625 alloy (also known as Inconel 625 pipe) is available in two grades. Inconel 625 Grade 1 seamless pipe is supplied in the annealed condition.
Inconel 625 Tube Spec Chart
| 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. |
Composition Chart of Inconel 625 DIN 2.4856 Tube
| Grade | C | Mn | Si | Fe | S | Cr2 | Al-Ti | Ni | |
| 625 | min. | – | – | – | – | – | 20.0 | – | 58.0 |
| max. | 0.10 | 0.50 | 0.50 | 5.0 | 0.015 | 23.0 | 0.40 | – | |
Mechanical Properties Chart of Inconel alloy 625 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 | ||||
| 625 | Psi – 1,35,000 , MPa -930 | Psi – 75,000 , MPa – 517 | 42.5 | – | – |
Fabrication and Grades
Seamless: U-tubes are manufactured without welding, offering excellent strength and pressure resistance.
Grade 2: This grade indicates the tube is supplied in a solution annealed condition, resulting in increased ductility and performance suitable for high-temperature applications.
U-tube: Standard U-tube for U-tube heat exchangers and other similar applications.
Applications
Chemical Processing: Due to its broad corrosion resistance, it is well-suited for heat exchangers, transfer piping, and thin-walled vessels.
Aerospace and Marine: Its high strength, seawater resistance, and high-temperature performance make it suitable for marine applications, submarine exhaust systems, and aircraft components.
Nuclear: Used in nuclear reactor components, including pumps and other high-pressure equipment.
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.
