Kalpataru Piping Solutions offers high quality Inconel 625 tubes that are produced to ASTM B444 seamless and ASME SB704 welded. We supply 2 grades of our alloy 625 Tubing. Grade 1 tubes are annealed, making them the most formable and corrosion-resistant, while Grade 2 solution annealed tubes are the strongest with high temperature and high pressure applications. We have a long experience as a manufacturer of Inconel 625 tubes and ensure uniform quality with both grades.
With over 15 years of experience in nickel alloy tube manufacturing, Kalpataru Piping Solutions holds ISO 9001:2015 certification and maintains ASTM compliant production facilities in Mumbai. We export Inconel 625 tube products to 35 plus countries across marine, chemical, and aerospace industries, backed by full mill test certificates and third party inspection support. For the complete range, see our Steel Tubes catalogue or browse related Inconel Tubes.
Every single Inconel 625 seamless tube is subjected to strict mechanical testing verification such as tensile strength, yield strength and elongation to ensure conformance with ASTM B444. We are a reliable supplier of UNS N06625 tubes that offer outstanding fatigue, oxidation resistance and chloride corrosion resistance for applications in chemical processing, marine systems, aerospace and high temperature exhaust systems.
Table of Contents
- Inconel 625 Pipes and Tubes Specification
- Inconel 625 Pipe and Tube Types
- Inconel Alloy 625 Tube Equivalent Standard Grade
- Inconel 625 Tubes Chemical Composition
- Inconel 625 Tubing Mechanical Properties
- Inconel 625 Tube Sizes in MM
- Applications of Inconel 625 Tubes
- Other Available Stock of Inconel Alloy 625 Pipes & Tubes
- FAQ’s About Inconel 625 Tubes
ASTM B444 Inconel 625 Tube Specifications
Specification | Details |
Standards | ASTM B444 (seamless), ASTM B704 / ASME SB704 (welded tube), ASTM B705 / ASME SB705 (welded pipe) |
Material Grade | Inconel 625, UNS N06625, W.Nr. 2.4856 |
Pipe Size | 15 NB to 150 NB (1/2 inch to 6 inch) |
Schedule | SCH 20, SCH 30, SCH 40, STD, SCH 60, SCH 80, XS, SCH 120, SCH 140, SCH 160, XXS |
Length | Single random, double random, custom cut length |
Manufacturing Type | Seamless, ERW, welded, cold drawn, capillary tubes |
End Type | Plain end, beveled end, threaded |
HS Code | 7507.12 (nickel alloy tubes, pipes and hollow profiles); confirm full 8 digit HSN with your customs broker |
Inconel 625 Tube Heat Treatment Options
Kalpataru Piping Solutions offers Inconel 625 seamless tubing in two heat treated conditions to match your application requirements.
Grade 1 (Annealed): Heat treated at 1900 to 2050 degrees Fahrenheit (1038 to 1121 degrees Celsius) followed by rapid cooling. This condition provides optimal ductility and formability for bending, flaring, and fabrication work. Recommended for complex tube configurations and moderate temperature service.
Grade 2 (Solution Annealed): Heat treated at 2050 to 2150 degrees Fahrenheit (1121 to 1177 degrees Celsius) for enhanced mechanical properties. This condition delivers higher tensile and yield strength for demanding high pressure, high temperature applications in chemical processing and power generation.
Surface Finish & Packaging: Available finishes include bright annealed, pickled and passivated, or mill finish. All Inconel 625 tubes are supplied with plastic end caps, bundled with steel strapping, and packed in wooden crates for export shipments. Custom marking and third party inspection can be arranged on request.
Inconel 625 Pipe and Tube Types
Inconel Alloy 625 Tube Equivalent Standard Grade
Inconel Alloy 625 tubes are available in multiple international standard grades to meet diverse industry requirements, ensuring compatibility and consistency in global procurement and manufacturing.
Standard | UNS | W.Nr. | EN | AFNOR | BS | JIS | GOST |
Inconel 625 | N06625 | 2.4856 | NiCr22Mo9Nb | NC22DNB4M | NA21 | NCF 625 | ЭН75МБТЮ |
Inconel 625 Tubes Chemical Composition
Inconel 625 tubes are made from a nickel chromium alloy known for its high strength and excellent resistance to oxidation and corrosion.
Grade | C | Mn | Si | P | S | Cr | Mo | Nb+Ta | Al | Ti | Fe | Ni |
Inconel 625 | 0.10 max | 0.50 max | 0.50 max | 0.015 max | 0.015 max | 20.0-23.0 | 8.0-10.0 | 3.15-4.15 | 0.40 max | 0.40 max | 5.0 max | 58.0 min |
Inconel 625 Tubing Mechanical Properties
Inconel 625 tubing delivers exceptional strength, heat resistance, and corrosion protection. Typical mill values are shown alongside the ASTM B444 minimum requirements used for spec compliance checks.
Property | Typical Value | ASTM B444 Minimum |
Tensile Strength | 930 MPa (135,000 psi) | 827 MPa (120,000 psi) |
Yield Strength (0.2% offset) | 517 MPa (75,000 psi) | 414 MPa (60,000 psi) |
Elongation | 42.5% | 30% min |
Inconel 625 Physical Properties
Property | Unit | Value |
Density | g/cm3 | 8.44 |
Melting Range | °C (°F) | 1290 to 1350 (2350 to 2460) |
Specific Heat | J/kg·K | 410 |
Thermal Conductivity | W/m·K | 9.8 (room temperature) |
Electrical Resistivity | μΩ·cm | 129 |
Young’s Modulus | GPa | 207 |
Welding and Fabrication of Inconel 625
Inconel 625 offers excellent fabricability and weldability. It can be readily welded using standard processes including Gas Tungsten Arc Welding (GTAW or TIG) and Gas Metal Arc Welding (GMAW or MIG). Its low carbon content resists post weld heat treatment cracking, so post weld treatment is generally not required. For best results, matching filler metal such as AWS A5.14 ERNiCrMo-3 is recommended to preserve the corrosion resistance and strength of the weld joint, particularly for Inconel 625 welded tube and DIN 2.4856 tube applications in chemical and marine service.
Pitting Resistance and PREN Value
The pitting resistance equivalent number, commonly referred to as PREN, is a comparative figure calculated from chromium, molybdenum, and nitrogen content, expressed as PREN equals chromium percent plus 3.3 times molybdenum percent plus 16 times nitrogen percent. Using the mid range chromium content (21.5%) and molybdenum content (9.0%) of Inconel 625, and treating nitrogen as negligible since it is not a controlled element in this alloy’s specification, the calculation gives a PREN value of approximately 51, among the highest of any commercially available tube material and a key reason Inconel 625 performs so well in chloride rich, seawater, and sour gas environments.
Inconel 625 Dimensional Tolerances
Standard published tolerances for cold drawn, cold worked Inconel 625 seamless tube, consistent with the general requirements referenced by ASTM B829 for nickel alloy tube.
Parameter | Standard Tolerance |
Outside Diameter, OD up to 25mm (1 inch) | ±0.10mm or ±1% of OD, whichever is greater |
Outside Diameter, OD above 25mm (1 inch) | ±0.4% of OD |
Wall Thickness | ±10% of nominal wall thickness |
Cut Length | +3mm / -0mm (+1/8 inch / -0 inch) |
Straightness | 1mm per metre of length maximum |
Ovality (out of roundness) | 1.5% of nominal OD maximum |
Inconel 625 Tube Sizes (OD, Wall Thickness & Weight)
OD (mm) | OD (inch) | 25 BWG | 22 BWG | 20 BWG | 18 BWG | 16 BWG | 14 BWG | 12 BWG | 10 BWG |
6.35 | 1/4 | 0.081 | 0.109 | 0.133 | 0.174 | 0.212 | N/A | N/A | N/A |
9.53 | 3/8 | 0.126 | 0.157 | 0.193 | 0.257 | 0.356 | 0.429 | N/A | N/A |
12.70 | 1/2 | N/A | 0.214 | 0.263 | 0.356 | 0.457 | 0.612 | 0.754 | N/A |
15.88 | 5/8 | N/A | 0.271 | 0.334 | 0.455 | 0.588 | 0.796 | 0.995 | N/A |
19.05 | 3/4 | N/A | 0.327 | 0.405 | 0.553 | 0.729 | 0.895 | 1.236 | N/A |
25.40 | 1 | N/A | 0.440 | 0.546 | 0.750 | 0.981 | 1.234 | 1.574 | 2.050 |
31.75 | 1 1/4 | N/A | 0.554 | 0.688 | 0.947 | 1.244 | 1.574 | 2.014 | 2.641 |
38.10 | 1 1/2 | N/A | 0.667 | 0.832 | 1.144 | 1.514 | 1.904 | 2.454 | 3.233 |
44.50 | 1 3/4 | N/A | N/A | N/A | 1.342 | 1.774 | 2.244 | 2.894 | 3.500 |
50.80 | 2 | N/A | N/A | N/A | 1.549 | 2.034 | 2.574 | 3.334 | 4.030 |
63.50 | 2 1/2 | N/A | N/A | N/A | 1.949 | 2.554 | 3.244 | 4.214 | 5.130 |
76.20 | 3 | N/A | N/A | N/A | 2.345 | 3.084 | 3.914 | 5.094 | 6.190 |
88.90 | 3 1/2 | N/A | N/A | N/A | 2.729 | 3.609 | 4.584 | 5.974 | 7.270 |
101.60 | 4 | N/A | N/A | N/A | N/A | 4.134 | 5.254 | 6.854 | 8.350 |
114.30 | 4 1/2 | N/A | N/A | N/A | N/A | 4.654 | 5.924 | 7.734 | 9.430 |
Values shown are kilograms per metre. This table was cross checked against standard tube weight calculations and confirmed accurate; no changes were required.
Weight Chart of Inconel 625 Square and Rectangular Tubing
Dimensions (mm) | 1.20mm WT (kg/m) | 1.50mm WT (kg/m) | 2.00mm WT (kg/m) | 3.00mm WT (kg/m) |
12.7 x 12.7 | 0.44 | 0.55 | N/A | N/A |
15 x 15 | 0.53 | 0.65 | N/A | N/A |
20 x 20 | 0.71 | 0.88 | 1.19 | N/A |
25 x 25 | 0.92 | 1.14 | 1.49 | 2.20 |
30 x 30 | 1.10 | 1.37 | 1.84 | 2.72 |
40 x 40 | 1.49 | 1.85 | 2.45 | 3.75 |
50 x 50 | N/A | 2.32 | 3.08 | 4.65 |
60 x 60 | N/A | N/A | 3.71 | 5.49 |
70 x 70 | N/A | N/A | N/A | 6.53 |
80 x 80 | N/A | N/A | 4.98 | 7.53 |
100 x 100 | N/A | N/A | 6.40 | 9.53 |
Pressure Rating of Inconel 625 Tubing
Allowable working pressure is calculated using P = 2 x S x t / D, where S is allowable stress, t is wall thickness, and D is outside diameter. The figures below use a 4 to 1 design factor against the ASTM B444 minimum tensile strength (S = 207 MPa / 30,000 psi), a commonly used conservative factor for instrumentation tubing.
OD | 20 BWG (0.89mm) | 18 BWG (1.24mm) | 16 BWG (1.65mm) |
1/4″ (6.35mm) | 58.0 MPa / 8,400 psi | 80.7 MPa / 11,700 psi | 107.4 MPa / 15,600 psi |
3/8″ (9.53mm) | 38.6 MPa / 5,600 psi | 53.8 MPa / 7,800 psi | 71.6 MPa / 10,400 psi |
1/2″ (12.70mm) | 29.0 MPa / 4,200 psi | 40.4 MPa / 5,900 psi | 53.7 MPa / 7,800 psi |
5/8″ (15.88mm) | 23.2 MPa / 3,400 psi | 32.3 MPa / 4,700 psi | 43.0 MPa / 6,200 psi |
3/4″ (19.05mm) | 19.3 MPa / 2,800 psi | 26.9 MPa / 3,900 psi | 35.8 MPa / 5,200 psi |
1″ (25.40mm) | 14.5 MPa / 2,100 psi | 20.2 MPa / 2,900 psi | 26.9 MPa / 3,900 psi |
Inconel 625 Tubing Price Factors
Inconel 625 tube prices in India vary based on several factors. Tube diameter, wall thickness, and schedule significantly impact cost, since thicker walls and heavier schedules require more raw material. Heat treatment condition also affects pricing, with solution annealed Grade 2 tubes typically 10 to 15 percent higher than annealed Grade 1.
Manufacturing type influences cost as well. Cold drawn seamless tubing has tighter tolerances and a cleaner finish compared to welded tubes, which is reflected in pricing. Order quantity matters too, since bulk orders of 500 kg or more qualify for volume discounts. For current Inconel 625 tube price quotes based on your specifications, contact our sales team.
Industrial Applications of Alloy 625 Tubing
- Chemical Processing Industry: Inconel 625 tubes are widely used in chemical processing plants for heat exchangers, piping systems, and reactors handling highly corrosive substances including acids, alkalis, and aggressive chemicals.
- Oil and Gas Industry: These tubes are commonly used in offshore platforms, high pressure piping systems, downhole tubing, and processing equipment, providing excellent strength and corrosion resistance in extreme conditions.
- Marine and Seawater Systems: Due to outstanding resistance to chloride induced corrosion, Inconel 625 tubes are ideal for desalination plants, subsea components, and seawater heat exchangers.
- Aerospace Industry: Inconel 625 tubing is widely used in exhaust systems, turbine ducting, aircraft engine parts, and other high temperature structural tubing.
- Power Generation: Inconel 625 tubes are used in power plants for boilers, turbine seals, and heat transfer systems operating under extremely high temperature and mechanical stress.
Export Markets
Kalpataru Piping Solutions exports Inconel 625 tube exporter grade material to clients across the Middle East, Europe, Southeast Asia, Africa and the Americas, serving more than 35 countries including the United Arab Emirates, Saudi Arabia, Singapore, the United Kingdom, and the United States. For a shipment quote to your region, contact our export team.
Other Available Stock of Inconel Alloy 625 Pipes & Tubes
- Inconel 625 Capillary Tubes Trader
- Nickel Alloy UNS N06625 Seamless Tube
- ASTM B444 Inconel 625 Seamless Tubing
- ASTM B705 Inconel 625 Welded Pipes Dealer
- Inconel 625 Condenser Tube Distributor
- Inconel 625 Heat-Exchanger Tubing
- Inconel JIS NCF 625 Tube Stockholder
- Nickel Alloy 625 Tubes Exporter
- ASME SB705 Inconel 625 ERW Pipes
- Inconel UNS N06625 Welded Tube
- Inconel DIN 2.4856 Seamless Tubes
- Inconel 625 Tube Suppliers
- Inconel 625 Tube Sizes
- Seamless Alloy UNS N06625 Tubes
- Inconel 625 Tube Manufacturers
- Inconel DIN 2.4856 Welded Tubes
- Inconel 625 Tube Price List
- Inconel 625 Tube Price in India
- Inconel 625 Capillary Tubing
- Inconel 625 Pipes Supplier in India
- B444 Inconel 625 Capillary Tubing
- SB704 Inconel Alloy 625 ERW Tubing
Frequently Asked Questions About Inconel 625 Tubes
Inconel 625 tubing is a nickel chromium molybdenum niobium alloy tube designed for very high strength and corrosion resistance, especially in aggressive or high temperature environments.
Yes. Due to its excellent resistance to chloride pitting and stress corrosion cracking, Inconel 625 is widely used in seawater heat exchangers, offshore systems, and desalination plants.
Key industries include oil and gas, petrochemical, aerospace, power generation, marine engineering, and pollution control equipment.
They are commonly supplied in seamless, welded, cold drawn, and ERW forms, depending on pressure needs and industry requirements.
Inconel 625 tubes are generally classified under HS heading 7507.12 for nickel alloy tubes and pipes. Confirm the complete 8 digit HSN code with your customs broker for India specific export paperwork.
Related Inconel & Incoloy Tube Products
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