Inconel 625 Pipe Fittings
Teshi Group manufactures Inconel 625 pipe fittings (ASTM B366 WPNCMC, B564 N06625) as an OEM in India — butt weld fittings to ASME B16.9 and forged socket weld and threaded fittings to ASME B16.11, with heat-number traceability on every piece.
Nickel–chromium alloys hold their strength and resist oxidation, carburisation and chloride stress corrosion cracking from cryogenic temperatures to well above 900 °C.
Inconel 625 pipe fittings at a glance
| Material | Inconel 625 |
|---|---|
| Specification | Butt weld: ASTM B366 WPNCMC · Forged: ASTM B564 N06625 |
| UNS / W.Nr. | N06625 / 2.4856 |
| Sizes | Butt weld NPS ½"–48", Sch 5S–XXS · Forged NPS ⅛"–4" |
| Pressure class | Wall to pipe schedule (B16.9) · Class 2000, 3000, 6000, 9000 (B16.11) |
| Facing / ends | Bevelled ends to ASME B16.25; socket weld and NPT threaded ends |
| Certification | EN 10204 3.1 standard · 3.2 with third-party inspection · IBR on request |
| Testing | PMI, hardness, dimensional; UT, IGC, impact and ferrite as specified |
Inconel 625 chemistry and mechanical properties
Chemical composition of Inconel 625 (weight %, maximum unless a range)
| Grade | C | Cr | Ni | Mo | Nb | Fe |
|---|---|---|---|---|---|---|
| Alloy 625 | 0.10 | 20.0–23.0 | 58.0 min | 8.0–10.0 | 3.15–4.15 (Nb+Ta) | 5.0 |
Mechanical properties of Inconel 625 (minimum, room temperature)
| Grade | Tensile strength | Yield strength (0.2 %) | Elongation | Note |
|---|---|---|---|---|
| Alloy 625 | 827 MPa (120 ksi) | 414 MPa (60 ksi) | 30 % | Annealed |
Matching specifications by product form
| Grade | Forged flanges & fittings | Butt weld fittings | Plate | Pipe |
|---|---|---|---|---|
| Alloy 625UNS N06625 · W.Nr. 2.4856 | ASTM B564 N06625 | ASTM B366 WPNCMC | ASTM B443 | ASTM B444 |
Limits and minimums from the governing ASTM / ASME specifications, summarised for convenience; the current edition takes precedence.
Pressure rating
Butt weld fittings carry the same pressure rating as straight seamless pipe of the same material and wall thickness, so the fitting schedule is matched to the line pipe (ASME B16.9). Forged socket weld and threaded fittings are rated by class — 3000 and 6000 for socket weld, 2000, 3000 and 6000 for threaded — per ASME B16.11.
Types we manufacture
Dimension charts
Where Inconel 625 is used
- Furnace, heater and high-temperature process piping
- Sour gas and oil well equipment (825, 625)
- Sulphuric and phosphoric acid service (825)
- Seawater and chloride service (625)
- Chemical and petrochemical reactors
Testing & certification
- PMI on every piece
- Intergranular corrosion testing to ASTM G28 when specified
- Ultrasonic testing of forgings when specified
- EN 10204 3.1 certificate; 3.2 on request
FAQ
Inconel 625 pipe fittings: common questions
What specification covers Inconel 625 pipe fittings?
Inconel 625 butt weld fittings are made to ASTM B366 WPNCMC with dimensions to ASME B16.9; forged socket weld and threaded fittings are made to ASTM B564 N06625 with dimensions to ASME B16.11.
What is the chemical composition of Alloy 625?
Alloy 625 (UNS N06625): C 0.10, Cr 20.0–23.0, Ni 58.0 min, Mo 8.0–10.0, Nb 3.15–4.15 (Nb+Ta), Fe 5.0 (weight %; single values are maximums).
What are the minimum mechanical properties of Alloy 625?
Tensile strength 827 MPa (120 ksi), yield strength 414 MPa (60 ksi), elongation 30 %.
Is Teshi Group a manufacturer of Inconel 625 pipe fittings in India?
Yes. Teshi Group has manufactured flanges and fittings in India since 1971 and is ISO 9001:2015 certified and IBR approved. Every Inconel 625 piece is hard-stamped with its heat number and supplied with an EN 10204 3.1 certificate; 3.2 with third-party inspection on request.
Which specification covers Inconel flanges?
Nickel alloy forgings including Inconel 600, 625 and 825 flanges are made to ASTM B564 / ASME SB564; butt weld fittings to ASTM B366 / ASME SB366.
What is the strength of Inconel 625?
Annealed alloy 625 (UNS N06625) forgings to ASTM B564 have a minimum tensile strength of 827 MPa and yield strength of 414 MPa.
Nickel alloys grade data sheets
Nickel alloys overview →Chemical composition, mechanical properties and PDF data sheet for each grade.
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