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Inconel 625 Socket Weld Fittings | UNS N06625 SB-564
Inconel 625 socket weld fittings (UNS N06625) forged to ASME SB-564 and dimensioned to ASME B16.11. Socket weld is preferred over butt weld for small bore, high pressure and instrument lines where access to the pipe ID is limited.
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This page covers the alloy dimension. For the full range of socket weld fitting forms in any nickel alloy, see our nickel alloy socket weld fittings overview.
Specification
| Designation | Value |
|---|---|
| UNS number | N06625 |
| Material specification | ASME SB-564 (Nickel Alloy Forgings) |
| Dimensional standard | ASME B16.11 |
| Material class | Nickel-chromium-molybdenum-columbium |
Note on specifications: SB-564 is the correct ASME Section II specification for forged nickel alloy fittings. SA-182 covers low alloy and stainless steel only and does not include any nickel alloy grades.
Product Range
| Fitting | Types |
|---|---|
| Socket weld elbow | 45°, 90°, 180° / reducing |
| Socket weld tee | Equal and reducing, straight and branch |
| Socket weld cross | Equal and reducing |
| Socket weld reducer | Concentric and eccentric |
| Socket weld coupling | Standard |
| Socket weld cap | Standard and heavy |
| Plug | Square head and hex head |
Chemical Composition (ASME SB-564)
| Element | Composition, % | Element | Composition, % |
|---|---|---|---|
| Nickel | Remainder | Carbon | 0.10 max |
| Chromium | 21.5 min | Manganese | 0.50 max |
| Molybdenum | 8.0 min | Silicon | 0.50 max |
| Niobium (Cb) | 3.15 – 4.15 | Phosphorus | 0.015 max |
| Iron | 5.0 max | Sulfur | 0.015 max |
| Aluminium | 0.40 max | Cobalt (if determined) | 1.0 max |
Composition consistent with the N06625 limits of ASME SB-444 Table 2, which defines the same alloy.
Dimensional Range
| Parameter | Range |
|---|---|
| Nominal size | DN15 – DN600 (NPS 1/2" – 24") |
| Wall thickness | SCH 5S, 10S, 40S, 80S, 160, XXS |
| Socket bore | To ASME B16.11, machined to suit pipe OD/tolerance |
| Forming route | Seamless pushing (DN ≤ 600) or plate forming/welding (DN > 600 or non-standard) |
| Ends | Bevelled to ASME B16.25, plain ends optional |
Quality Control
- EN 10204 3.1 mill test certificate on every fitting
- Full chemical analysis by XRF or OES, actual heat values on the certificate
- Dye penetrant inspection on every fitting; ultrasonic testing on heavy wall and forgings
- Dimensional inspection against the governing dimensional standard
- Intergranular corrosion testing to ASTM G28 available on request
- Third-party inspection by Lloyd’s, BV, DNV, SGS or TUV on request
Surface, Marking and Packing
Fittings are supplied solution annealed and pickled, with a bright annealed or pickled surface as required. Each fitting carries heat number, grade, standard, size, heat treatment condition and our works mark. Export packing in wooden cases or steel pallets with plastic end caps.
Technical Enquiries
Send the grade, fitting type, nominal size, schedule, quantity and any third-party inspection requirement to our technical sales desk. We will confirm dimensional tolerance, delivery condition and the applicable ASME line item, and quote FOB Shanghai or Ningbo.
Applications
- Chemical process and pharmaceutical piping
- Instrument and impulse lines
- Sour gas gathering and processing
- Offshore and marine piping
- Aerospace and cryogenic ground support
Related Products
- Nickel alloy socket weld fittings — all forms, all alloys
- Nickel alloy butt weld fittings
- Nickel alloy flanges
- Nickel alloy pipe and tube
Frequently Asked Questions
When should I use socket weld instead of butt weld?
Socket weld is normally chosen for sizes DN50 and below where the pipe cannot easily be bevelled or where the joint must be made without a dedicated welding crew. For larger sizes, butt weld is stronger and more economical because it removes the joint gap and filler metal.
Are Grade 1 or Grade 2 fittings better?
Grade 1 gives higher strength and suits most chemical service up to about 593°C. Grade 2 is solution annealed for better creep and rupture resistance and is normally specified above 593°C.
Do you supply NACE-compliant hardness?
Yes. Where the service requires it, we can supply hardness records and control the condition to the NACE MR0175 / ISO 15156 limits. State this on your enquiry.
Do you supply EN 10204 3.1 certificates?
Yes, as standard on every fitting, with third-party inspection available on request.
