Inconel 625 pipes
Gnee Steel
Inconel 625 chemical industry process pipes
Inconel 625 alloy pipe is an ideal material for chemical process piping due to its exceptional resistance to high temperatures, high pressures, a wide range of chemicals, and corrosive environments. Its high nickel, chromium, and molybdenum content creates a protective layer against corrosion and erosion. The alloy's high strength, fatigue resistance, and excellent weldability enable the manufacture of robust and reliable pipes suitable for applications such as distillation columns, heat exchangers, reaction vessels, and chemical transfer lines.
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What is the difference between Inconel 625 Grade 1 and Grade 2?
Grade 1 is typically annealed at around 1600°F to 1800°F (approximately 871°C to 982°C) to provide good ductility and corrosion resistance while maintaining higher strength than Grade 2. Grade 2 is heat treated above 2000°F (approximately 1093°C) to enhance creep and stress-rupture resistance while maintaining corrosion resistance.
Inconel 625 pipe, a tubing material composed of nickel, chromium, and iron, is widely used in the chemical industry. It is suitable for applications such as chemical reactors, evaporators, and distillation equipment. It features a high density (8.44 g/cm³), a high coefficient of thermal expansion (12.8×10^(-6)/°C), a high thermal conductivity (13.3 W/(m·K)), and good ductility (45%). Its melting point is between 1290-1350°C, with a yield strength of 275 MPa and a tensile strength of 620 MPa. Inconel 625 pipe can withstand the corrosive chemicals and high temperatures encountered in the chemical industry and is used in critical applications such as chemical reactors, evaporators, and distillation equipment to ensure equipment reliability and performance. Overall, Inconel 625 pipe is an ideal piping material for the chemical industry, offering excellent corrosion resistance and high-temperature strength to meet the demands of extreme operating conditions.
UNS N06625 pipe ASTM Specification
| Inconel 625 pipe ASTM Specification | Details |
|---|---|
| Specifications | ASTM B167 / B829 / B517, ASTM B705, ASTM B444, ASTM B474 |
| AMS Standards | AMS 5581, AMS 5599, AMS 5666 |
| Manufacturing Types | Seamless, ERW, Welded, Fabricated, CDW, CDS, DOM, CEW, 100% X-Ray Welded |
| Thickness Range | SCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXH, SCH XXS, SCH XS |
| Industry Standards | SUS, JIS, AISI, ASTM, GB, DIN, EN |
| Annealed Condition Grades | ASTM B444 Grade 1, ASTM B444 Grade 2, ASME SB444 GR.1, ASME SB444 GR.2 |
| Value-Added Services | Cutting, Beveling, Threading, Destructive and Non-Destructive Testing, Ultrasonic Testing, Draw & Expansion to required sizes and lengths |
| End Types | Plain End, Beveled End, Treaded Alloy 625 Pipe |
| Marking | Specification, Material Grade, Nominal Size, Schedule or Wall Thickness, Manufacturing Method (Seamless/Welded), Heat Number, Manufacturer's Name/Logo |
| Example Marking | ASTM B444 UNS N06625 12" NB SCH 40S SEAMLESS HEAT NO. XXXX |
| Test Certificates | Manufacturer Test Certificate, 100% Radiography Report, DFARS Compliant, EN 10204/3.1B & 3.2 MTCs, Fumigation Certificates, Raw Materials Certificate, Third Party Inspection Report, Laboratory Test Certificate from Govt. Approved Lab, etc. |
| Packaging | Packed in PE Fabric Bundles, ply wooden box wrapped in plastic, or standard seaworthy export packaging |
Chemical Composition of UNS N06625 Cold Drawn Seamless Tube
Chemical Composition of 625 Nickel Pipe
| Element | C | Mn | Si | Fe | S | Cr | Al-Ti | Ni |
|---|---|---|---|---|---|---|---|---|
| min. | ----- | ----- | ----- | ----- | ----- | 20.0 | --- | 58.0 |
| max. | 0.10 | 0.50 | 0.50 | 5.00 | 0.015 | 23.0 | 0.40 | - |
Mechanical Properties of ASTM B444 Inconel 625 Pipe
| Alloy | Tensile Stress (min) | Yield Stress (0.2% Proof, min) | Elongation (% in 50mm, min) | Hardness (max) |
|---|---|---|---|---|
| 625 | 135,000 Psi / 930 MPa | 75,000 Psi / 517 MPa | 42.5 | -- |
Key Properties for Chemical Industry 625 Pipes
Corrosion Resistance: Inconel 625 chemical industry pipe exhibits excellent corrosion resistance in a wide range of corrosive environments, including seawater, various acids, and alkalines.
High-Temperature Strength: It maintains structural integrity and mechanical properties even at extreme temperatures, which is critical for high-temperature processes.
Mechanical Strength: The alloy's high tensile and fatigue strengths enable it to withstand high pressures and cyclic loading without failure, which is crucial for reliable long-term performance.
Weldability: Its excellent weldability and fabrication properties make it suitable for the fabrication of complex piping systems and assemblies.
Nickel Based Alloy 625 Pipe Schedule Chart
| Size | Schedule |
|---|---|
| 1/8" (.405" O.D.) | SCH 40, 80 |
| 3/8" (.675" O.D.) | SCH 10, 40, 80 |
| 1/2" (.840" O.D.) | SCH 5, 10, 40, 80, 160, XXH |
| 1/4" (.540" O.D.) | SCH 10, 40, 80 |
| 3/4" (1.050" O.D.) | SCH 10, 40, 80, 160, XXH |
| 1" (1.315" O.D.) | SCH 5, 10, 40, 80, 160, XXH |
| 1-1/4" (1.660" O.D.) | SCH 10, 40, 80, 160, XXH |
| 1-1/2" (1.900" O.D.) | SCH 10, 40, 80, 160, XXH |
| 2" (2.375" O.D.) | SCH 10, 40, 80, 160, XXH |
| 2-1/2" (2.875" O.D.) | SCH 10, 40, 80, 160, XXH |
| 3" (3.500" O.D.) | SCH 5, 10, 40, 80, 160, XXH |
| 3-1/2" (4.000" O.D.) | SCH 10, 40, 80, 160, XXH |
| 4" (4.500" O.D.) | SCH 10, 40, 80, 160, XXH |
| 5" (5.563" O.D.) | SCH 10, 40, 80, 160, XXH |
| 6" (6.625" O.D.) | SCH 5, 10, 40, 80, 120, 160, XXH |
| 8" (8.625" O.D.) | SCH 5, 10, 40, 80, 120, 160, XXH |
| 10" (10.750" O.D.) | SCH 10, 20, 40, 80 (.500), TRUE 80 (.500) |
Types of Alloy 625 Pipes
Inconel 625 Seamless Pipe
Inconel 625 seamless pipe is forged from a single solid metal billet, which is then heated and extruded or drawn through a mandrel to form a hollow tube. The absence of welds makes these pipes extremely strong and reliable, making them particularly suitable for high-pressure, high-temperature applications. Their structural integrity is crucial for critical industries such as oil and gas, chemicals, and power generation.
Inconel 625 Welded Pipe
Inconel 625 welded pipe, by contrast, is made from flat metal sheets or plates that are rolled into a cylindrical shape. The edges are then fused together using a welding process, forming a seam along the length of the pipe. This method is generally more cost-effective and allows for the production of larger diameter pipes that would be impossible with seamless production.
Alloy 625 ERW (Electric Resistance Welded) Pipe
ERW pipe is a special type of welded pipe. Its manufacturing process involves forming a flat metal strip into a tube and then fusing the edges together using a high-frequency electric current. An electric current heats the edges to a molten state, then forges them together under pressure, creating a strong, consistent, and clean weld without the use of filler metal.
Inconel 625 EFW (Electric Fusion Welded) Pipe
EFW pipe is another type of welded pipe produced using the fusion welding process. In the EFW process, filler metal is added to the seam between the edges of the rolled metal sheets. Once the filler material melts, it forms a strong, durable joint. This method is typically used for pipes with thicker walls or larger diameters.
Available Forms of Inconel 625 Pipes
Inconel 625 pipe is available in a variety of forms and tempers to suit different industrial needs. These include:
Applications of 625 Pipes
The exceptional properties of Inconel 625 pipe make it an ideal high-temperature alloy for some of the harshest, most critical environments. Its high strength, excellent corrosion resistance, and exceptional resistance to extreme temperatures make it a must-have for a wide range of industries and applications.
Aerospace: Due to its excellent strength-to-weight ratio and high-temperature oxidation resistance, 625 alloy tubing is used in components such as exhaust systems, engine parts, and piping.
Marine: Due to its excellent resistance to pitting and crevice corrosion, 625 alloy tubing is well-suited for use in seawater environments. Common applications include marine exhaust systems, propulsion motors, and submarine components.
Chemical Processing: Used in reactors, distillation columns, and heat exchangers, these equipment must withstand a variety of corrosive acids and chemicals.
Oil and Gas: Used in downhole equipment, wellhead components, and piping in sour gas environments, 625 alloy tubing effectively resists corrosion and sulfide stress cracking in these environments.
Nuclear: Used in nuclear reactor core and control rod components, 625 alloy tubing offers excellent resistance to corrosion and radiation damage.
About Gnee Steel
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Gnee Steel is a supplier of Inconel alloy 625, offering a wide range of products including seamless pipes (sizes: 4-219 mm, thickness: 0.5-20 mm); welded pipes (sizes: 5.0-1219.2 mm, thickness: 0.5-20 mm); plates (sizes: 0.1-100 mm, width: 10-2500 mm); strip; round bars (sizes: 3-800 mm, diameter: 3-800 mm); flat bars (sizes: 2-100 mm, thickness: 10-500 mm); hexagonal bars (sizes: 2-100 mm); wire rod; and extruded sections. We partner with steel mills to provide our customers with 625 alloy that meets or exceeds numerous leading industry standards, including ASTM, ASME, SAE, AMS, ISO, DIN, EN, and BS.
Gnee Steel stocks and sells Inconel 625 alloy, pipe, tube, plate, strip, sheet, round bar, flat bar, forging billet, hexagon, wire and extruded sections. Please feel free to contact us for a quote at ss@gneesteel.com ss@gneemetal.com
