Inconel 625 Pipe Fittings
Table of Content
- Key Benefits of Inconel 625 Pipe Fittings
- ASTM B366 / ASME SB366 Specification Table
- Inconel 625 Pipe Fittings — Complete Product Range
- Inconel 625 Chemical Composition (UNS N06625 / ASTM B366)
- Inconel 625 Mechanical Properties (ASTM B366)
- Inconel 625 Equivalent Grades
- Industry Applications
- Related Inconel 625 Products from Kalpataru Piping
- Inconel 625 Pipe Fittings Price & Payment
- Frequently Asked Questions (FAQ)
Inconel 625 Pipe Fittings Supplier & Exporter in India – ASTM B366 / ASME SB366
Inconel 625 Pipe Fittings Inconel 625 Pipe Fittings are the high end nickel-chromium-molybdenum buttweld fittings produced under ASTM B366 / ASME SB366 specifications. These fittings are made of UNS N06625 (DIN 2.4856) alloy, which is highly resistant to pitting, crevice corrosion, oxidation, and stress-corrosion cracking over a service temperature of -196 o C to 982 o C (cryogenic to 1800 F).
Kalpataru Piping is a major manufacturer, supplier and exporter of Inconel 625 Pipe Fittings of oil and gas, aerospace, chemical processing, marine and nuclear industries with the customer base spread across 80 plus countries. Our Inconel 625 Buttweld Fittings are fabricated in seamless (1/2 -10) and welded (1/2 -48) options and are manufactured without post-weld heat treatment (PWHT) that make it easier to fabricate in the field and shortens project schedules.
Key Benefits of Inconel 625 Pipe Fittings
- No PWHT Required — Simplified fabrication; fittings can be welded in place without post-weld heat treatment, reducing cost and schedule risk.
- Superior Corrosion Resistance — Outstanding resistance to seawater, acids, alkalis, and chloride environments due to the Ni-Cr-Mo-Nb matrix.
- High Temperature Strength — Retains mechanical properties from cryogenic service up to 982 °C (1800 °F).
- Grade 1 & Grade 2 Available — Grade 1 (annealed) for higher room-temperature strength; Grade 2 (solution annealed) for superior creep resistance above 593 °C.
- Broad Standard Compliance — Manufactured to ANSI B16.9, B16.28, MSS-SP-43, EN 10253-1, DIN 2605, PED 2014/68/EU.
- Wide Size Range — Seamless ½” – 10″ / Welded ½” – 48″ covering all project requirements.
ASTM B366 / ASME SB366 Specification Table
| Specification | Details |
| Standard | ASTM B366 / ASME SB366 |
| Grade / UNS No. | UNS N06625 (Alloy 625) |
| DIN Designation | 2.4856 |
| Product Form | Buttweld Pipe Fittings (Elbow, Tee, Reducer, Cap, Stub End, Bend, Cross) |
| Grade 1 | Annealed — Higher room-temperature strength |
| Grade 2 | Solution Annealed — Better creep resistance above 593 °C |
| Size Range – Seamless | ½” NPS to 10″ NPS |
| Size Range – Welded | ½” NPS to 48″ NPS |
| Wall Thickness | SCH 5S to SCH XXS (per ASME B36.19M) |
| Dimensional Standards | ANSI B16.9 / B16.28 / MSS-SP-43 / EN 10253-1 / DIN 2605 |
| Radius Options (Elbow) | Long Radius (1.5D) / Short Radius (1D) |
| Bend Angles | 22.5° / 30° / 45° / 60° / 90° / 180° |
| Bend Radius Options | R = 1D, 2D, 3D, 5D, 7D, 10D |
| Delivery Condition | Annealed / Solution Annealed |
| Test Requirements | Hydrostatic, PMI, Hardness, Radiography (RT), Ultrasonic (UT) |
| Compliance | PED 2014/68/EU, NACE MR-0175 |
| Country of Origin | India |
| PWHT Required? | No — a significant buyer advantage for offshore and field fabrication |
Inconel 625 Pipe Fittings — Complete Product Range
We supply all standard ASTM B366 Inconel 625 fittings types as listed below. Custom configurations are available on request.
Inconel 625 Elbow — 45° / 90° / 180°
Inconel 625 Elbow fittings are available in Long Radius (LR, 1.5D) and Short Radius (SR, 1D) configurations.
- Inconel 625 90° Long Radius Elbow (LR) — Most common; low-pressure-drop direction change.
- Inconel 625 90° Short Radius Elbow (SR) — Compact installations with space constraints.
- Inconel 625 45° Elbow — Gradual directional change; reduced turbulence.
- Inconel 625 180° Return Bend — U-bend configuration for heat exchangers and reactors.
- Bending angles available: 22.5°, 30°, 45°, 60°, 90°, 180°
Inconel 625 Tee — Equal & Reducing
- Inconel 625 Equal Tee — All three outlets the same diameter; branch connections in the same pipeline.
- Inconel 625 Reducing Tee — Branch outlet is smaller than the run pipe; ideal for dual-flow systems.
Inconel 625 Reducer — Concentric & Eccentric
- Inconel 625 Concentric Reducer — Centre-line aligned; used where there is no concern about liquid accumulation.
- Inconel 625 Eccentric Reducer — Flat-bottom alignment; prevents air pockets and liquid slugging in horizontal lines.
Inconel 625 Pipe Cap
Inconel 625 Pipe Cap fittings are used to close the end of a pipe. Available in seamless and welded construction, they withstand full system operating pressure and are ASTM B366 compliant.
Inconel 625 Stub End
Inconel 625 Stub End is used with a loose backing flange (lap joint flange), enabling easy disassembly. Supplied in Types A and B (MSS-SP-43 / ANSI B16.9).
Inconel 625 Cross
Inconel 625 Cross fittings (four-way fittings) provide branch connections in two perpendicular directions simultaneously, commonly used in fire suppression and distribution headers.
Inconel 625 Pipe Bend — Hot Induction, Piggable & Long Radius
- Inconel 625 Long Radius Bend — R = 3D to 10D; preferred for pig-launcher assemblies and minimum-pressure-drop systems.
- Inconel 625 Piggable Bend — Enables inline inspection tools (pigs) to pass without obstruction.
- Inconel 625 Hot Induction Bend — Manufactured by hot induction bending for large-diameter applications.
- Bend Radius Options: R = 1D, 2D, 3D, 5D, 7D, 10D
- Bend Angles: 22.5°, 30°, 45°, 60°, 90°, 180°
Inconel 625 Chemical Composition (UNS N06625 / ASTM B366)
| Element | Min % | Max % |
| Nickel (Ni) | 58.00 | — |
| Chromium (Cr) | 20.00 | 23.00 |
| Molybdenum (Mo) | 8.00 | 10.00 |
| Niobium + Tantalum (Nb+Ta) | 3.15 | 4.15 |
| Iron (Fe) | — | 5.00 |
| Manganese (Mn) | — | 0.50 |
| Silicon (Si) | — | 0.50 |
| Aluminium (Al) | — | 0.40 |
| Titanium (Ti) | — | 0.40 |
| Cobalt (Co) | — | 1.00 |
| Carbon (C) | — | 0.10 |
| Phosphorus (P) | — | 0.015 |
| Sulphur (S) | — | 0.015 |
Inconel 625 Mechanical Properties (ASTM B366)
| Property | Grade 1 (Annealed) | Grade 2 (Solution Annealed) |
| Tensile Strength (min) | 827 MPa (120 ksi) | 758 MPa (110 ksi) |
| Yield Strength – 0.2% Offset (min) | 414 MPa (60 ksi) | 345 MPa (50 ksi) |
| Elongation in 2″ (min) | 30% | 30% |
| Hardness (max) | ≤ 35 HRC | ≤ 35 HRC |
| Density | 8.44 g/cm³ | 8.44 g/cm³ |
| Melting Range | 1290–1350 °C | 1290–1350 °C |
| Service Temp. Range | −196 °C to 982 °C | −196 °C to 982 °C |
Inconel 625 Equivalent Grades
| Standard | Designation |
| UNS (USA) | N06625 |
| ASTM / ASME | B366 / SB366 (fittings), B444/SB444 (pipe) |
| DIN / EN (Europe) | 2.4856 / NiCr22Mo9Nb |
| BS (UK) | NA21 |
| JIS (Japan) | NCF625 |
| AFNOR (France) | NC22DNb |
| Trade Name | Inconel 625, Alloy 625, Chronin 625, Haynes 625 |
Size Range & Dimensions
|
Type |
NPS Range |
Wall Thickness |
Standard |
|
Seamless Buttweld Fittings |
½” to 10″ |
SCH 5S to SCH XXS |
ANSI B16.9 / MSS-SP-43 |
|
Welded Buttweld Fittings |
½” to 48″ |
SCH 5S to SCH 80 |
ANSI B16.9 |
|
Short Radius Elbow |
½” to 10″ (seamless) |
SCH 5S to XXS |
ANSI B16.28 |
|
Stub End (Type A/B) |
½” to 48″ |
Per pipe schedule |
MSS-SP-43 / B16.9 |
|
Pipe Bends |
1″ to 48″ |
Per requirement |
ASME B16.49 / Customer Spec |
Weldability — No Post-Weld Heat Treatment (PWHT) Required
Inconel 625 Buttweld Fittings do not require post-weld heat treatment (PWHT) after installation welding — a critical advantage for offshore, subsea, and field-fabricated piping systems.
- The Nb (niobium) + Mo (molybdenum) combination stabilises the alloy matrix, preventing sensitisation during welding.
- Compatible with matching filler wire: ERNiCrMo-3 (AWS A5.14) — the same composition as the base material, ensuring full corrosion resistance at the weld zone.
- No pre-heat required for most applications (except thick-section joints above 25 mm in very cold climates).
- Suitable for GTAW (TIG), GMAW (MIG), SMAW, and orbital welding processes.
- NACE MR-0175 compliant — approved for sour-service (H₂S) environments without PWHT.
Manufacturing Standards & Compliance
|
Standard |
Scope |
|
ASTM B366 / ASME SB366 |
Primary fitting material and dimensional standard |
|
ANSI B16.9 |
Factory-made wrought buttwelding fittings |
|
ANSI B16.28 |
Wrought steel buttwelding short-radius elbows and returns |
|
MSS-SP-43 |
Wrought and fabricated butt-welding fittings for low-pressure / corrosion-resistant applications |
|
EN 10253-1 / DIN 2605 |
European standard for buttwelding fittings |
|
ASME B16.49 |
Factory-made wrought induction bends for transportation |
|
PED 2014/68/EU |
European Pressure Equipment Directive — CE approved |
|
NACE MR-0175 / ISO 15156 |
Sour-service (H₂S) compliance |
Industry Applications
- Oil & Gas — Subsea pipelines, FPSOs, offshore risers, sour-service headers, wellhead components
- Petrochemical — Acid gas scrubbers, heat exchanger headers, reactor inlet/outlet piping
- Marine & Naval — Seawater piping, desalination plants, propeller shaft protection
- Aerospace — Engine exhaust systems, thrust reverser components, high-temperature ducting
- Chemical Processing — Phosphoric acid, sulphuric acid, hydrochloric acid service piping
- Nuclear — Primary coolant piping, waste handling systems
- Power Generation — Flue gas desulphurisation (FGD) systems, waste incineration
- Pharmaceutical — High-purity process lines, sterile fluid handling systems
Related Inconel 625 Products from Kalpataru Piping
Explore our complete range of Inconel 625 products:
Inconel 625 Pipes & Tubes Supplier — Seamless & welded pipes in ASTM B444 / ASME SB444
Inconel 625 Flanges Supplier — ASTM B564 flanges: WN, SO, Blind, Lap Joint
Inconel 625 Fasteners Supplier — Stud bolts, hex bolts, nuts to ASTM B446
Inconel 625 Round Bars Supplier — Forged & rolled bars to ASTM B446
Inconel 625 Buttweld Fittings — Parent Category — Full range of Inconel alloy buttweld fittings
All Inconel Products — Complete Inconel 600, 625, 718 product catalogue
Inconel 625 Pipe Fittings Price & Payment
Inconel 625 Pipe Fittings price depends on fitting type, size, wall thickness, and quantity. Kalpataru Piping offers competitive ex-works pricing from India with short lead times.
- Payment Modes: T/T (Bank Transfer), LC at Sight, DP/DA, Western Union (small orders)
- Delivery: Ex-Works Mumbai / CIF Port of Destination
- Lead Time: Ex-stock for standard sizes; 2–4 weeks for large or custom orders
- Packaging: ISPM-15 compliant fumigated wooden crates / bundled with end caps for export
- For bulk pricing, please contact our sales team or submit the quotation request form.
Frequently Asked Questions (FAQ)
What is the difference between ASTM B366 Grade 1 and Grade 2?
Grade 1 (annealed) has increased tensile and yield strength at room temperature. Grade 2 (solution annealed) offers better creep and rupture resistance at temperatures above 593 o C, and is therefore favoured in high temperature service.
Is PWHT necessary after welding Inconel 625?
No. Inconel 625 does not need to be subjected to post-weld heat treatment (PWHT). The niobium stabilises the alloy and eliminates sensitisation which enables the use of the fitting directly after weld. This is a significant cost and time savings in offshore and field fabrication.
What are the bending angles of Inconel 625 elbows and bends?
Standard bending angles are 22.5°, 30°, 45°, 60°, 90°, and 180°. Bend radii available are R = 1D, 2D, 3D, 5D, 7D, and 10D.
Does it approve Inconel 625 usage in sour-service (H 2 S ) applications?
Yes. Inconel 625 is NACE MR-0175 / ISO 15156 compliant and is widely used in sour-service oil and gas environments without any PWHT requirement.
What industries do you most commonly see Inconel 625 pipe fittings?
The major sectors are offshore oil and gas, subsea industry, petrochemical, aerospace, marine, chemical processing, nuclear and pharmaceutical. The combination of strength, resistance to corrosion and ability to weld makes the alloy the material of choice in these challenging industries.
What is the UNS or DIN equivalent of Inconel 625?
The UNS designation is N06625 and the European DIN designation is 2.4856 (EN designation: NiCr22Mo9Nb).
Request a Quote for Inconel 625 Pipe Fittings
Get competitive pricing from India’s leading Inconel 625 Pipe Fittings supplier.
