Monel Pipe Fittings Manufacturer
Metinox Overseas is a leading Monel fittings manufacturer India, and supplies Monel 400 (UNS N04400) and Monel K500 (UNS N05500) Buttweld fitting to clients all over the Middle East, Europe, Southeast Asia and the Americas. All of the fittings supplied are made to ASTM B366 / ASME SB366 and sized to ASME B16.9 and include full material test reports, heat numbers and third party inspection on request. As a trusted Monel 400 K500 pipe fittings manufacturer India, our monel pipes are available in sizes 1/2 NPS to 24 NPS, short lead-time, competitive pricing and reliable documentation for critical service applications such as seawater piping, hydrofluoric acid alkylation units, marine offshore structures and oil and gas processing. Please reach out to our team for a quick RFQ with Monel pipe fittings price per kg India and Delivery Time.
Table of Contents
- What Are Monel Pipe Fittings?
- Monel Pipe Fittings Specifications
- Types of Monel Pipe Fittings
- Monel 400 vs Monel K500 Grade Comparison
- Monel Pipe Fittings Chemical Composition
- Monel Pipe Fittings Mechanical Properties
- Monel Pipe Fittings Material Grade Equivalents
- Applications of Monel Pipe Fittings
- Monel Pipe Fittings Specifications and Standards
- Why Choose Metinox Overseas for Monel Pipe Fittings?
- Related Products
- Frequently Asked Questions
What Are Monel Pipe Fittings?
Monel pipe fittings are buttweld fittings made from nickel-copper alloy in two main grades: Monel 400 (N04400) and Monel K500 (N05500). They are employed in all those environments where standard stainless steel or carbon steel fittings are not effective in resisting aggressive corrosion, such as seawater service, hydrofluoric acid service, or marine offshore structures. They have a similar chemistry (63% Ni minimum) although the difference in mechanical strength performance is significant between both grades.
The most ubiquitous of the solid-solution-strengthened grades, Monel 400 has a minimum tensile strength of 550 MPa (80 ksi) and is used in most corrosive pipeline applications. Monel K500 is the precipitation-hardened alloy, which contains aluminum (2.30 to 3.15%) and titanium (0.35 to 0.85%) to provide it with increased tensile strength, nearly 57% higher than Monel 400 in the aged condition (ASTM B366 minimum: 862 MPa / 125 ksi). The important procurement requirement of K500 should always be in the aged condition. K500 fittings supplied in the annealed (solution-treated) condition do not meet the minimum mechanical properties of ASTM B366 aged condition. Always specify 'K500 in aged condition' on purchase orders and verify condition on the MTR.
Monel Pipe Fittings Specifications
| Standard | ASTM B366 / ASME SB366 |
|---|---|
| Dimensions | ASME/ANSI B16.9, ASME B16.28 |
| Size Range | 1/2 NPS to 24 NPS |
| Manufacturing Type | Seamless, Welded, Fabricated (100% X-Ray Welded Available) |
| Wall Thickness | SCH 5S, SCH 10S, SCH 40S, SCH 80S, SCH 160S, SCH XXS |
| Product Forms | Elbows, Tees, Reducers, Caps, Stub Ends, Bends, Crosses |
| Construction Type | Seamless / Welded / Fabricated |
| Bending Radius | R = 1D, 2D, 3D, 5D, 6D, 8D, 10D or Custom Radius |
| Material Grades | Monel 400 (UNS N04400), Monel K500 (UNS N05500) |
| Inspection & Testing | PMI Testing, Hydrostatic Testing, Visual Inspection, Dimensional Inspection, Third-Party Inspection on Request |
| Documentation | Mill Test Certificate (EN 10204 3.1), Heat Number Traceability, NABL Approved Test Reports |
Types of Monel Pipe Fittings
MONEL 400 PIPE FITTINGS
Monel Butt weld Cross
Monel Butt weld Elbow
Monel Butt weld Pipe Bend
Monel Butt weld Reducer
Monel Butt weld Stub End
Monel Butt weld Tee
MONEL K500 PIPE FITTINGS
Sourcing Monel 400 or K500 buttweld fittings for a critical service application?
Metinox Overseas supplies ASTM B366-certified fittings with EN 10204 3.1 MTRs and third-party inspection.
Request a QuoteMonel 400 vs K500 Pipe Fittings Difference
| Property | Monel 400 (N04400) | Monel K500 (N05500) |
|---|---|---|
| Best Use / Key Addition | None (solid solution) | Al + Ti (precipitation hardening) |
| Tensile (min) | 862 MPa / 125 ksi | 1100 MPa / 160 ksi (aged) |
| Heat Treatment | Not required | Aged condition mandatory |
| Weldability | Excellent | Good (anneal then re-age after welding) |
| Cost vs 400 | Base | Approx. 30 to 40% higher |
| Primary Applications | Seawater piping, HF acid | Marine shafts, springs, fasteners |
Monel Pipe Fittings Chemical Composition
The table below shows the ASTM B366 chemical composition for Monel 400 (N04400) and Monel K500 (N05500). The addition of aluminium and titanium in K500 is the sole reason for its precipitation-hardening capability.
| Element | Monel 400 (N04400) | Monel K500 (N05500) |
|---|---|---|
| Nickel (Ni) | 63.0% min | 63.0% min |
| Copper (Cu) | 28.0 to 34.0% | 27.0 to 33.0% |
| Aluminium (Al) | Not present | 2.30 to 3.15% (precipitation hardening) |
| Titanium (Ti) | Not present | 0.35 to 0.85% (precipitation hardening) |
| Iron (Fe) | 2.5% max | 2.0% max |
| Manganese (Mn) | 2.0% max | 1.5% max |
Monel Pipe Fittings Mechanical Properties
All Monel 400 and K500 pipe fittings supplied by Metinox Overseas meet the minimum mechanical property requirements of ASTM B366 / ASME SB366. Dual units (MPa and ksi) are provided to support both metric and imperial design specifications. Note that Monel K500 properties apply to the aged condition only.
| Property | Monel 400 | Monel K500 (Aged) |
|---|---|---|
| Tensile Strength (min) | 862 MPa / 125 ksi | 1100 MPa / 160 ksi |
| Yield Strength (min) | 586 MPa / 85 ksi | 790 MPa / 115 ksi |
| Elongation (min) | 35% | 20% |
Monel Pipe Fittings Material Grade Equivalents
| Grade | UNS | EN / DIN | JIS | BS |
|---|---|---|---|---|
| Monel 400 | N04400 | 2.4360 / NiCu30Fe | - | NA 13 |
| Monel K500 | N05500 | 2.4375 / NiCu30Al | - | NA 18 |
Applications of Monel Pipe Fittings
Monel pipes and fittings are specified where corrosion resistance in highly aggressive media is mandatory and where standard austenitic stainless steels are inadequate. Key service environments include:
- Seawater piping systems: Monel 400 resists biofouling, pitting, and crevice corrosion in seawater at all flow velocities. Widely used in desalination plants, offshore platforms, and naval vessels. See our Monel 400 Pipe Fittings page for size and schedule details.
- Hydrofluoric acid alkylation units: Monel 400 is one of only a handful of alloys with acceptable corrosion rates in anhydrous and aqueous HF acid environments. ASTM B366 Monel pipe fittings are the standard choice for HF acid alkylation unit piping in petroleum refining.
- Marine propeller shafts and pump components: Monel K500 (aged) provides the corrosion resistance of Monel 400 combined with the high strength required for shafts, pump impellers, and valve stems operating in seawater. Visit our Monel K500 Pipe Fittings page for K500-specific specifications.
- Oil and gas processing: Sour gas environments, produced water lines, and subsea equipment where chloride stress corrosion cracking of stainless steel is a documented failure mode. Monel fittings for marine offshore oil gas service are tested to NACE MR0175 / ISO 15156 requirements.
- Chemical processing: Caustic soda, chlorinated solvents, and organic acids where nickel-copper alloys outperform other engineering materials.
- Instrumentation lines: Monel tube fittings for instrumentation lines in chemical and petrochemical plants, where high-integrity joints and leak-free performance are critical.
Monel 400 buttweld fittings are acceptable under NACE MR0175 / ISO 15156-3 for sour service environments. Verify heat treatment and hardness requirements with the client's project specification before confirming compliance.
Monel Pipe Fittings Specifications and Standards
All Monel 400 K500 buttweld fittings supplied by Metinox Overseas are manufactured and tested against the following specifications:
| Standard | Scope |
|---|---|
| ASTM B366 / ASME SB366 | Wrought nickel-copper alloy (Monel) buttweld fittings, seamless and welded |
| ASME B16.9 | Factory-made wrought buttweld fittings |
| UNS N04400 | Monel 400 alloy designation |
| UNS N05500 | Monel K500 alloy designation |
| ASTM B564 | Monel forged fittings (flanges and fittings by hot or cold working) |
| Size Range | 1/2 NPS to 24 NPS |
Why Choose Metinox Overseas for Monel Pipe Fittings?
- ASTM B366 / ASME SB366 Monel 400 and K500 fittings with heat number traceability.
- Supply support for seawater, hydrofluoric acid, marine offshore and oil and gas service.
- EN 10204 3.1 MTRs, PMI testing, dimensional inspection and third-party inspection on request.
- Export packing, competitive pricing and quick RFQ support for global clients.
Request a Quote for Monel Pipe Fittings at Metinox Overseas
ASTM B366 | Monel 400 and K500 | Sizes 1/2 to 24 NPS
Contact UsFrequently Asked Questions
Monel pipe fittings are used in seawater piping systems, hydrofluoric acid alkylation units, marine offshore structures, oil and gas processing, and chemical plants handling caustic or acidic media. Their nickel-copper alloy chemistry provides outstanding corrosion resistance where stainless steels fail. Contact Metinox Overseas, the best Monel 400 K500 fittings supplier exporter.
Monel 400 is solid-solution strengthened with 550 MPa minimum tensile. Monel K500 adds aluminium and titanium for precipitation hardening, reaching 1100 MPa minimum tensile in the aged condition. K500 costs approximately 30 to 40% more and must always be procured in the aged condition for rated strength.
ASTM B366 / ASME SB366 covers wrought nickel and nickel-alloy buttweld pipe fittings including Monel 400 (WPNC) and Monel K500 in both seamless and welded product forms. Dimensional requirements are specified in ASME B16.9.
Yes. Monel 400 pipe fittings for seawater are among the most widely specified nickel alloy fittings for marine service. Monel 400 resists pitting, crevice corrosion, and biofouling in seawater across all flow velocities and temperatures encountered in offshore and naval applications.
The high nickel content (63% minimum) combined with copper in Monel 400 forms a stable, adherent surface film in hydrofluoric acid environments. This film minimises corrosion in both anhydrous and aqueous HF across the concentration and temperature ranges found in HF acid alkylation units, where most stainless grades suffer rapid attack.
Enquire Now
Get pricing within 24 hours!
