Metinox Overseas is one of the leading Monel 400 fittings manufacturer India that provides ASTM B366 Monel 400 pipe fittings and ASME SB366 certified UNS N04400 buttweld pipe fittings to procurement engineers, EPC contractors and plant operators in 50+ countries around the world. We carry elbows, tees, reducers, stub ends, caps in sizes of 1/2 NPS to 24 NPS and wall thickness from SCH 10S – SCH 80S. As a trusted Monel 400 UNS N04400 buttweld fittings manufacturer India, we provide all our materials with Mill Test Certificate (MTC), third party inspection and NABL accreditations on request. Contact our technical sales team directly for RFQ, bulk pricing or delivery lead time.
Metinox Overseas holds ISO 9001:2015 certification and has exported Monel 400 pipe fittings to projects in the Middle East, Europe, and Southeast Asia. All material supplied with EN 10204 3.1 mill test reports and NABL-accredited laboratory backing.
Table of Contents
- What Are Monel 400 UNS N04400 Pipe Fittings?
- Monel 400 Pipe Fittings Specifications
- Monel 400 Pipe Fittings Types
- UNS N04400 Chemical Composition
- Monel 400 Pipe Fittings Mechanical Properties
- Monel 400 vs Monel K500 Comparison
- Monel 400 Equivalent Grades
- Monel 400 Pipe Fittings Dimension Chart
- Monel 400 Pipe Fittings Weight Chart
- Pressure-Temperature Ratings for Monel 400 Pipe Fittings
- Monel 400 Buttweld Fittings Tolerance
- Applications of Monel 400 Pipe Fittings
- Related Products
- Frequently Asked Questions
What Are Monel 400 UNS N04400 Pipe Fittings?
Monel 400 pipe fittings are nickel-copper alloy buttweld fittings made of UNS N04400 material, which consists of at least 63% nickel and 28–34% copper. These fittings conform to ASTM B366 / ASME SB366 (material) and ASME B16.9 (dimensions) and are manufactured in seamless and welded (WPNC) product forms from 1/2 NPS to 24 NPS.
Monel 400 is the only commercially pure nickel-copper alloy which can be used for hydrofluoric acid (HF) at all concentrations up to 120°C. HF attacks stainless steel, carbon steel and most nickel alloys. This resistance is due to the formation of a copper fluoride surface film which forms immediately after contact with HF and repairs itself when damaged. This results in Monel 400 being the material of choice for HF (alkylation) unit piping in petroleum refineries around the world.
Beyond HF acid service, Monel 400 fittings are specified for seawater piping, offshore platform topside systems, desalination plants, marine hardware, chemical processing, and oil and gas applications. Equivalent designations include Alloy 400, DIN 2.4360, and NiCu30Fe. Explore our complete range of Monel pipe fittings to compare all available Monel grades.
Monel 400 Pipe Fittings Specifications
| Standard | ASTM B366 / ASME SB366 |
|---|---|
| UNS Designation | N04400 |
| Common Trade Name | Monel 400 / Alloy 400 |
| DIN Equivalent | 2.4360 (NiCu30Fe) |
| Product Form | Wrought buttweld fittings (seamless and welded) |
| Heat Treatment | Annealed |
| Dimensional Standard | ASME B16.9 |
| Size Range | 1/2 NPS to 24 NPS |
| Wall Thickness | SCH 10S to SCH 80S |
| Service Temperature | Cryogenic to 480°C (900°F) continuous service | Per Nickel Institute / ASME B31.3 design data |
Monel 400 is readily weldable by GTAW, GMAW, and SAW. Recommended filler: ERNiCu-7 (Monel 60 wire) per AWS A5.14. Post-weld heat treatment is not required for Monel 400.
Monel 400 Pipe Fittings Types
400 Monel 1D Elbow
400 Monel Reducers
400 Monel Reducing Outlet Tees
400 Monel Straight Tees
Alloy 400 5D Elbow
Alloy 400 180° Short Radius Elbow
Alloy 400 Bend
Alloy 400 Reducing Cross
ASME SB366 Alloy 400 1.5D Elbow
ASME SB366 Alloy 400 Cap
ASME SB366 Alloy 400 Welded Elbows
ASTM B366 UNS N04400 45° Short Radius Elbow
ASTM B366 UNS N04400 180° Long Radius Elbow
ASTM B366 UNS N04400 Equal Tee
ASTM B366 UNS N04400 Long Radius Bend
DIN 2.4360 3D Elbow
DIN 2.4360 45° Long Radius Elbow
DIN 2.4360 Concentric Reducer
DIN 2.4360 End Cap
DIN 2.4360 Long Stub End
DIN 2.4360 Short Stub End
Monel 400 90° Short Radius Elbow
Monel 400 Lap Joint Stub Ends
Monel 400 Straight Crosses
Monel Alloy 400 Piggable Bend
Monel Alloy 400 Reducing Tee
Monel Alloy 400 Seamless Buttwelding 45° and 90° Elbows
Nickel 400 Eccentric Reducer
Nickel 400 Equal Cross
Nickel 400 Lateral Tee
Nickel 400 Reducing Outlet Crosses
Nickel 400 Seamless Buttwelding 180° Returns
Nickel 400 Stub End
Request a Quote for Monel 400 pipe fittings price per kg India
Submit RFQ to Metinox Overseas — Fast Response, Mill Certificates, Third-Party Inspection Available
Request a QuoteUNS N04400 Chemical Composition
| Element | Min % | Max % | Note |
|---|---|---|---|
| Nickel (Ni) | 63.0 | — | Primary element, 63% min including Co |
| Copper (Cu) | 28.0 | 34.0 | Base alloying element |
| Iron (Fe) | — | 2.5 | — |
| Manganese (Mn) | — | 2.0 | — |
| Carbon (C) | — | 0.30 | — |
| Silicon (Si) | — | 0.5 | — |
| Sulphur (S) | — | 0.024 | — |
Monel 400 Pipe Fittings Mechanical Properties
| Property | Requirement (SI) | Requirement (Imperial) |
|---|---|---|
| Tensile Strength (min) | 550 MPa | 80 ksi |
| Yield Strength 0.2% (min) | 240 MPa | 35 ksi |
| Elongation (min) | 35% | 35% |
| Hardness (max) | Not specified per ASTM B366 | |
Monel 400 vs Monel K500 Comparison
| Factor | Monel 400 (N04400) | Monel K500 (N05500) |
|---|---|---|
| Ni + Cu Content | Ni 63% min / Cu 28 to 34% | Ni 63% min / Cu 27 to 33% |
| Al + Ti Addition | None | Al 2.3 to 3.15% + Ti 0.35 to 0.85% |
| Strengthening Mechanism | Solid solution | Precipitation hardening |
| Tensile Strength (min) | 862 MPa / 125 ksi (ASTM B366 min) | 1100 MPa / 160 ksi |
| Heat Treatment for Full Strength | Not required | Yes, aged condition must be specified |
| HF Acid Resistance | Excellent | Excellent |
| Preferred Use | Piping, vessels, valves | Shafts, fasteners, high-strength parts |
Monel 400 Equivalent Grades
| Standard | Designation |
|---|---|
| UNS (USA) | N04400 |
| ASTM / ASME | ASTM B366 / ASME SB366 |
| DIN (Germany) | 2.4360 |
| EN (Europe) | NiCu30Fe |
| BS (UK) | NA 13 |
| Trade Name | Monel 400 / Alloy 400 |
Monel 400 Pipe Fittings Dimension Chart
| Nominal Pipe Size (in) | Outside Diameter | 90° Elbows — Center to Face (in) | 45° LR Center to Face (in) | 180° Returns LR (in) | ||||
|---|---|---|---|---|---|---|---|---|
| mm | inch | LR | SR | Radius | Center to Center | Back to Face | ||
| 1/2 | 21.3 | 0.840 | 1 1/2 | – | 5/8 | – | 2 | 1 7/8 |
| 3/4 | 26.7 | 1.050 | 1 1/8 | – | 7/16 | – | 2 1/4 | 1 11/16 |
| 1 | 33.4 | 1.315 | 1 1/2 | 1 | 7/8 | – | 3 | 2 3/16 |
| 1 1/4 | 42.2 | 1.660 | 1 7/8 | 1 1/4 | 1 | – | 3 3/4 | 2 3/4 |
| 1 1/2 | 48.3 | 1.900 | 2 1/4 | 1 1/2 | 1 1/8 | 3 | 4 1/2 | 3 1/4 |
| 2 | 60.3 | 2.375 | 3 | 2 | 1 3/8 | 4 | 6 | 4 3/16 |
| 2 1/2 | 73.0 | 2.875 | 3 3/4 | 2 1/2 | 1 3/4 | 5 | 7 1/2 | 5 3/16 |
| 3 | 88.9 | 3.500 | 4 1/2 | 3 | 2 | 6 | 9 | 6 1/4 |
| 3 1/2 | 101.6 | 4.000 | 5 1/4 | 3 1/2 | 2 1/4 | 7 | 10 1/2 | 7 1/4 |
| 4 | 114.3 | 4.500 | 6 | 4 | 2 1/2 | 8 | 12 | 8 1/4 |
| 5 | 141.3 | 5.563 | 7 1/2 | 5 | 3 1/8 | 10 | 15 | 10 5/16 |
| 6 | 168.3 | 6.625 | 9 | 6 | 3 3/4 | 12 | 18 | 12 5/16 |
| 8 | 219.1 | 8.625 | 12 | 8 | 5 | 12 | 24 | 16 5/16 |
| 10 | 273.1 | 10.750 | 15 | 10 | 6 1/4 | 15 | 30 | 20 3/8 |
| 12 | 323.9 | 12.750 | 18 | 12 | 7 1/2 | 18 | 36 | 24 3/8 |
Monel 400 Pipe Fittings Weight Chart
Values shown as 90° Elbow / 45° Elbow / Tee (kg)
| DN | Sch 10S | Sch 40S | Sch 80S |
|---|---|---|---|
| 8 | 0.02 / 0.01 / 0.03 | 0.03 / 0.02 / 0.06 | 0.04 / 0.03 / 0.07 |
| 15 | 0.06 / 0.03 / 0.09 | 0.08 / 0.04 / 0.10 | 0.10 / 0.05 / 0.14 |
| 25 | 0.14 / 0.08 / 0.28 | 0.15 / 0.11 / 0.29 | 0.22 / 0.14 / 0.38 |
| 50 | 0.50 / 0.25 / 0.85 | 0.70 / 0.40 / 1.28 | 0.91 / 0.59 / 1.59 |
| 80 | 1.25 / 0.63 / 1.77 | 2.20 / 1.08 / 3.31 | 2.97 / 1.50 / 4.45 |
| 100 | 2.10 / 1.08 / 3.46 | 4.47 / 2.09 / 5.27 | 6.18 / 2.81 / 7.71 |
| 150 | 5.45 / 2.72 / 8.07 | 10.89 / 5.44 / 10.99 | 16.32 / 8.16 / 13.61 |
| 200 | 10.20 / 5.33 / 15.65 | 21.54 / 10.77 / 20.91 | 33.11 / 16.56 / 28.12 |
| 250 | 18.15 / 9.75 / 26.46 | 38.56 / 19.27 / 35.38 | 51.71 / 25.86 / 49.90 |
| 300 | 25.80 / 13.62 / 39.46 | 59.42 / 29.71 / 62.14 | 79.38 / 39.69 / 83.91 |
Pressure-Temperature Ratings for Monel 400 Pipe Fittings
| Temp (°F) | Temp (°C) | Class 150 (psi) | Class 300 (psi) | ||
|---|---|---|---|---|---|
| 1/4 – 1 inch | 1 1/4 – 2 inch | 2 1/2 – 3 inch | |||
| -20 to 150 | -29 to 66 | 300 | 2000 | 1500 | 1000 |
| 200 | 93 | 265 | 1785 | 1350 | 910 |
| 250 | 121 | 225 | 1575 | 1200 | 825 |
| 300 | 149 | 185 | 1360 | 1050 | 735 |
| 350 | 177 | 150 | 1150 | 900 | 650 |
| 400 | 204 | – | 935 | 750 | 560 |
| 450 | 232 | – | 725 | 600 | 475 |
| 500 | 260 | – | 510 | 450 | 385 |
| 550 | 288 | – | 300 | 300 | 300 |
Monel 400 Buttweld Fittings Tolerance
| ASME B16.9 NPS | ID at End (in) | OD at Bevel (in) | Min. Wall Thickness | Overall Length H (in) | Center-End A, C, B (in) | Overall Length F (in) |
|---|---|---|---|---|---|---|
| 1/2 – 2-1/2 | +0.06 / -0.03 | Not less than 87.5% of nominal T | 87.5% of nominal T | +/- 0.06 | +/- 0.06 | +/- 0.12 |
| 3 – 3-1/2 | +/- 0.06 | Not less than 87.5% of nominal T | 87.5% of nominal T | +/- 0.06 | +/- 0.06 | +/- 0.12 |
| 4 | +/- 0.06 | Not less than 87.5% of nominal T | 87.5% of nominal T | +/- 0.06 | +/- 0.12 | – |
| 5 – 8 | +/- 0.06 | Not less than 87.5% of nominal T | 87.5% of nominal T | +/- 0.06 | +/- 0.25 | – |
| 10 – 18 | +/- 0.12 | +0.16 / -0.12 | 87.5% of nominal T | +/- 0.09 | +/- 0.09 | +/- 0.25 |
| 20 – 24 | +/- 0.19 | +0.25 / -0.19 | 87.5% of nominal T | – | +/- 0.25 | – |
| 26 – 30 | +/- 0.19 | +0.25 / -0.19 | 87.5% of nominal T | – | +/- 0.38 | – |
| 32 – 48 | +/- 0.19 | +0.25 / -0.19 | 87.5% of nominal T | – | +/- 0.38 | – |
Applications of Monel 400 Pipe Fittings
Monel 400 (UNS N04400) buttweld fittings are specified where standard stainless steel or carbon steel fittings fail under corrosive attack. Key service environments:
- Hydrofluoric acid (HF) alkylation units: Monel 400 is the standard material for HF alkylation unit piping in petroleum refining. The copper fluoride passive film provides resistance across all HF concentrations up to 120°C — a property no common stainless or carbon steel grade can match.
- Seawater and marine service: Resists biofouling, pitting, and crevice corrosion in seawater at all flow velocities. Specified for offshore platforms, desalination plants, and naval vessel pipework.
- Oil and gas processing: Sour gas lines, produced water headers, and subsea systems where chloride stress corrosion cracking eliminates standard austenitic stainless options. Confirm NACE MR0175 compliance for sour service projects.
- Chemical processing: Caustic soda, organic acids, and chlorinated solvents where nickel-copper alloys show lower corrosion rates than stainless steel.
- Instrumentation and process tubing: High-integrity Monel 400 tube fittings for instrument lines in chemical and petrochemical plants.
Monel 400 buttweld fittings are acceptable under NACE MR0175 / ISO 15156-3 for sour service environments subject to hardness and heat treatment verification. Confirm project-specific NACE compliance requirements before ordering.
Get Monel 400 Pipe Fittings Price List and Mill Test Certificates
Contact Metinox Overseas — Submit Your Specifications for Instant RFQ
Contact UsFrequently Asked Questions
Monel 400 (UNS N04400) is a solid-solution nickel-copper alloy with 63% min nickel and 28 to 34% copper, manufactured to ASTM B366. It offers exceptional HF acid and seawater resistance, making it the standard for HF alkylation piping in petroleum refining worldwide. Contact Metinox Overseas, the most trusted N04400 Monel fittings exporter for your Monel 400 pipe fittings requirements.
Monel 400 resists HF acid across all concentrations up to 120°C via a self-repairing copper fluoride surface film. No other common alloy, including stainless steel or carbon steel, offers equivalent HF resistance, making it the preferred material for alkylation unit piping.
Monel 400 pipe fittings are manufactured to ASTM B366 / ASME SB366 for wrought nickel-alloy buttweld fittings. Dimensional requirements follow ASME B16.9 and MSS SP-43. The UNS designation is N04400 and the DIN equivalent is 2.4360 (NiCu30Fe).
Yes. UNS N04400 fittings are specified for offshore platforms, desalination plants, and marine hardware. Monel 400 resists seawater corrosion, pitting, and biofouling across a wide range of flow velocities and temperatures encountered in offshore and naval applications.
Monel 400 (N04400) is solid-solution with 550 MPa tensile strength, suited for piping, vessels, and valves. Monel K500 (N05500) adds aluminium and titanium for precipitation hardening, achieving a minimum tensile strength of 862 MPa / 125 ksi per ASTM B366 in the aged (SA+A) condition, with typical high-grade stock testing above 1000 MPa.
Enquire Now
Get pricing within 24 hours!
