01
Monel 400 Seamless Pipe
NPS 1/8 through NPS 8 for process lines, manifolds, and utility headers.
Request Availability →Monel 400 Pipe and Tube
Seamless tube and pipe to B165 and B163, welded product to B725 and B730, sized for seawater and HF duty.
Seamless Core, Welded Reach
Above all, B165 and B163 cover Monel 400 pipe and seamless tube, while B725 and B730 carry the larger and thinner-wall sizes.
Small Sizes as Standard
In addition, instrument and capillary tube leave the plant from 1.6 mm outside diameter with wall tolerance held to the drawing.
Exchanger-Ready Bundles
Moreover, U-bend, straight, and coiled tube arrive with the hydrostatic or eddy-current records exchanger duty demands.
PRODUCT OVERVIEW
About Monel 400 Pipe and Tube
Monel 400 Pipe and Tube carries UNS N04400 into seawater, hydrofluoric acid, and caustic circuits. Copper at 28–34% keeps the surface stable in flowing chloride water, and nickel supplies the balance. Tubular product takes that chemistry into heat exchangers, process lines, and instrument runs.
Grade-level chemistry, standards, and process limits sit on the Monel 400 hub. Ordering detail for the other two routes sits on the Monel 400 Bar and Rod and Monel 400 Plate and Sheet pages.
PRODUCT FEATURES
Key Features of Monel 400 Pipe and Tube
Monel 400 pipe and tube covers UNS N04400 in seamless form to ASTM B165 and B163, plus welded pipe and tube to B725 and B730. The grade resists flowing seawater, hydrofluoric acid, and caustic solutions, so tubular product suits exchanger bundles, acid lines, and instrument runs. Small-diameter tube starts at 1.6 mm outside diameter, and heat-exchanger tube arrives straight, U-bent, or coiled. EN 10204 3.1 certificates and heat-level traceability travel with every bundle.
Monel 400
Seamless Range to NPS 8
Above all, Monel 400 pipe and tube run from 6 mm to 219 mm outside diameter, with wall fixed by the order.
01
Heat-Exchanger Tube
Meanwhile, B163 tube arrives in straight lengths, U-bends, or coils for condenser and exchanger bundles.
02
Small-Diameter Precision Tube
Consequently, instrument and capillary sizes from 1.6 mm outside diameter hold tight wall tolerance for control lines.
03
Welded Product for Large Lines
Still, B725 and B730 extend the range where seamless supply stops, and each welded length takes an anneal after its seam.
04
Flowing-Seawater Service
Therefore, chloride-bearing cooling water suits the grade, provided the circuit keeps the medium moving.
05
Hydrofluoric Acid Handling
In short, HF at every concentration up to boiling remains inside the envelope, so acid lines run in this alloy.
06
Caustic and Alkali Circuits
Moreover, caustic soda causes little attack, which suits evaporator tubing and alkali transfer lines.
07
Weld-Ready Delivery
ERNiCu-7 filler covers the joint, and interpass control below 150 °C keeps most welds free of a post-weld anneal.
08
WHY CHOOSE US
Why Choose Monel 400
Every enquiry reaches the team that schedules nickel-copper tube drawing and welding on one site. To begin with, we check the ordered diameter, wall, and condition against real mill capability. Therefore, the promise in the quotation holds when production starts.
01
Specification Compliance
We check grade, outside diameter, wall, and test scope against B165 before drawing starts.
02
Quality and Traceability
Heat numbers, EN 10204 3.1 certificates, and eddy-current or hydrostatic records travel with each consignment.
03
Flexible Supply
One coil, one bundle, or a full container load runs through the same qualified nickel-copper route.
04
Responsive Service
Answers come back with wall tolerance, condition, and documents rather than vague lead times.
MANUFACTURING PROCESS
Reliable Production For Critical Applications
Monel 400 pipe and tube start as a nickel-copper heat melted to the UNS N04400 balance. Above all, each length then follows one route to the ordered condition. The plant records chemistry and mechanical results against the heat number.
01
Charge Preparation
Refined nickel and cathode copper go into the charge at the UNS N04400 balance, with impurity limits taken from B165.
02
Melting and Casting
The charge melts in induction furnaces and then casts into round or rectangular billets for piercing.
03
Tube Piercing
A mandrel pierces the heated billet, and the wall thickens or thins as the shell extends.
04
Cold Drawing
Pilgering, plug drawing, or cold rolling brings the shell to the ordered outside diameter and wall.
05
Heat Treatment
Annealing follows each cold pass to restore ductility, and stress relief sets the higher-strength condition.
06
Welded Tube Production
For welded product, strip forms to size, the seam welds, and the length takes an anneal afterwards.
07
Straightening and Cutting
Roller straightening, cut-to-length work, or U-bend forming finishes the tube for shipping.
08
Inspection and Release
Hydrostatic, eddy-current, dimensional, and tensile checks run before the bundle leaves the works.
Manufacturing Facility
MANUFACTURING CAPABILITY
Advanced Production For Nickel Alloy Products
Monel 400 pipe and tube ship in standard and custom sizes, with condition, end finish, and test scope settled before drawing starts. In addition, the figures below show the plant behind that commitment.
20,000+ m²
Factory Area
Drawing, welding, and inspection bays on one site.
50+
Production Machines
Cold-drawing benches, welding lines, and finishing equipment.
600 Tons
Monthly Capacity
Nickel-copper and nickel alloy tubular output.
30+
Technical Engineers
Metallurgists who fix wall tolerance and test scope at quotation.
6
Tubular Routes
Seamless pipe, seamless tube, exchanger tube, welded pipe, welded tube, and coiled product.
QUALITY ASSURANCE
Strict Quality Control From Production To Delivery
Each bundle leaves the works only after the ordered B165 or B163 requirements show on the heat. Moreover, composition, tensile results, and dimensions stay with the material for incoming verification.
01
Material Verification
Spectrometer analysis confirms the UNS N04400 balance before the shell enters drawing.
02
Pressure and Leak Testing
Hydrostatic testing to the B165 formula, or an eddy-current examination for exchanger tube.
03
Dimensional Inspection
Outside diameter, wall, ovality, and length follow the tolerance class on the order.
04
Certification and Traceability
EN 10204 3.1 documents link every bundle to its heat number.
PRODUCT FORMS
Available Product Forms
Above all, six tubular routes carry this grade, and each one keeps its own size window and test scope.
02
Monel 400 Seamless Tube
OD 6–219 mm in straight lengths for general tubular work.
Request Availability →
03
Monel 400 Heat-Exchanger Tube
B163 tube supplied straight, U-bent, or coiled to the bundle drawing.
Request Availability →
04
Monel 400 Small-Diameter Tube
OD 1.6–25.4 mm for instrumentation, capillary, and sampling lines.
Request Availability →
05
Monel 400 Welded Pipe
B725 pipe above the seamless range, annealed after its seam.
Request Availability →
06
Monel 400 Welded Tube
B730 tube in coil or fixed length for lighter walls and larger diameters.
Request Availability →
APPLICATIONS
Engineered For Demanding Industries
Consequently, tubular product serves plants where chlorides, hydrofluoric acid, or caustic dominate the stream. The duties below pair each service with the tube route that carries it.
Discuss Your Application →
01
Seawater Cooling Circuits
Condenser and exchanger tube for once-through and closed-loop chloride water.
02
Hydrofluoric Acid Lines
Transfer and reboiler tubing in alkylation units where HF runs hot.
03
Caustic Evaporation Trains
Heating tubes for caustic concentration and alkali recovery.
04
Desalination Plants
Brine heater and recovery tubing in multi-stage flash and membrane trains.
05
Instrument and Impulse Lines
Small-diameter tube for transmitters, analysers, and sampling systems.
06
Heat-Exchange Bundles
U-bend tube for shell-and-tube exchangers in refinery and chemical duty.
07
Offshore Process Piping
Seawater and utility lines on platforms where spray reaches the metal.
08
Sour Gas Gathering Lines
Tubular product released inside the NACE hardness envelope for H2S service.
09
Pharmaceutical Plant
Process lines that need caustic and solvent resistance in the same circuit.
TECHNICAL INFORMATION
Technical Specifications
Detailed technical information including chemical composition, mechanical properties, standards and available dimensions.
Chemical Composition
Limits for the tubular family follow one window across B165, B163, B725, and B730. In addition, seamless and welded product share that chemistry. Nickel runs at 63.0% minimum with cobalt inside that figure, and copper sits between 28.0% and 34.0%.
| Element | Content |
|---|---|
| Nickel (Ni) plus Cobalt (Co) | 63.0% min. |
| Copper (Cu) | 28.0–34.0% |
| Iron (Fe) | 2.5% max. |
| Manganese (Mn) | 2.0% max. |
| Carbon (C) | 0.30% max. |
| Silicon (Si) | 0.50% max. |
| Sulfur (S) | 0.024% max. |
Mechanical Properties
The values below come from B165 for seamless pipe and tube, and B163 adds the exchanger-tube requirements. Therefore, the condition and the outside diameter decide which row applies.
| Product Form | Standard | Condition | Tensile Strength | Yield Strength, 0.2% Offset | Elongation |
|---|---|---|---|---|---|
| Seamless pipe and tube | ASTM B165 | Annealed, outside diameter to 127 mm | ≥70 ksi (483 MPa) | ≥28 ksi (193 MPa) | 35% |
| Seamless pipe and tube | ASTM B165 | Annealed, outside diameter above 127 mm | ≥70 ksi (483 MPa) | ≥25 ksi (172 MPa) | 35% |
| Seamless pipe and tube | ASTM B165 | Stress-relieved, all sizes | ≥85 ksi (586 MPa) | ≥55 ksi (379 MPa) | 15% |
| Heat-exchanger tube | ASTM B163 | Annealed | ≥70 ksi (483 MPa) | ≥28 ksi (193 MPa) | 35% |
B725 and B730 set acceptance for welded product in their own tables. For that reason, quote the edition on your order, and we return those figures with the offer.
Physical Properties
Values below are typical figures for design calculations rather than acceptance tests. Meanwhile, magnetic permeability stays low, because the Curie point sits just above the usual working range.
| Property | Value |
|---|---|
| Alloy | Monel 400 |
| UNS | N04400 |
| Werkstoff | 2.4360 |
| Density | Approx. 8.80 g/cm³ |
| Melting range | Approx. 1300–1350 °C |
| Modulus of elasticity | Approx. 179 GPa |
| Thermal conductivity at 20 °C | Approx. 21.8 W/m·K |
| Specific heat at 20 °C | Approx. 427 J/kg·K |
| Electrical resistivity at 20 °C | Approx. 0.51 µΩ·m |
| Thermal expansion, 20–100 °C | Approx. 13.9 µm/m·K |
| Curie temperature | Approx. 21–49 °C |
| Strengthening route | Cold work only |
Standards
B165, B163, B725, and B730 divide the tubular supply between them, and the ASME SB editions take over under pressure-code jurisdiction. Moreover, the general-requirements documents below set testing and dimensional practice.
| Standard | Product / Application |
|---|---|
| ASTM B165 | Seamless pipe and tube |
| ASTM B163 | Seamless heat-exchanger and condenser tube |
| ASTM B725 | Welded pipe in the annealed condition |
| ASTM B730 | Welded tube in the annealed condition |
| ASTM B829 | General requirements for seamless nickel alloy pipe and tube |
| ASTM B775 / B751 | General requirements for welded pipe and welded tube |
| ASME SB165 / SB163 / SB725 / SB730 | Counterparts under pressure-code jurisdiction |
| SAE AMS 4574 | Seamless tubing, 67Ni - 30Cu, annealed |
| ASME B16.25 | Buttwelding ends |
| DIN 17751 | Nickel-copper alloy tube, W.Nr. 2.4360 |
| ISO 6207 | Nickel alloy seamless tube |
| NACE MR0175 / ISO 15156 | Sour service in oil and gas production |
| UNS N04400 · W.Nr. 2.4360 · NiCu30Fe | Designations |
The product documents come from ASTM International. Meanwhile, aerospace fluid systems reference AMS 4574, which covers annealed seamless tubing in 67Ni - 30Cu.
Dimensions
| Product Form | Typical Supply Range | Length |
|---|---|---|
| Seamless pipe | NPS 1/8 to NPS 8, outside diameter to 219 mm | Single random, double random, or custom |
| Seamless tube | OD 6–219 mm, wall 0.5–12.7 mm | Up to 12 m or custom cut |
| Heat-exchanger tube | OD 6.35–76.2 mm, wall 0.7–6 mm | Up to 12 m or U-bend |
| Small-diameter tube | OD 1.6–25.4 mm, wall 0.2–2 mm | Coil or fixed length |
| Welded pipe | OD 21.3–610 mm, wall 0.5–12.7 mm | Fixed length or random |
| Welded tube | OD 3.18–127 mm, wall 0.38–12.7 mm | Coil or fixed length |
Ranges above reflect normally produced sizes, and heavy wall or large diameter depends on billet supply. Therefore, state outside diameter, wall, length, condition, and end finish when you order Monel 400 pipe.
Surface Finishes
| Surface Condition | Typical Characteristics / Applications |
|---|---|
| Annealed and pickled | Standard delivery for seawater, HF, and caustic duty |
| Bright annealed | Scale-free bore and outside diameter for instrumentation |
| Cold drawn | Close wall tolerance with a smooth finish |
| Pickled only | Acid-descaled surface for general chemical piping |
| U-bend and coil | Formed to the exchanger drawing with the bend anneal recorded |
| Beveled end | Weld preparation to the agreed standard for butt joints |
TECHNICAL DOCUMENTATION
Download Technical Datasheet
Get detailed information including specifications, standards, dimensions and material properties.
HOW TO START
Start Your Order in 7 Simple Steps
Most tubular consignments leave the works two to four weeks after release, and heavy-wall welded pipe runs longer. Above all, the steps below fix standard, condition, and test scope before metal moves.
1
Send the Enquiry
List the outside diameter, wall, length, quantity, and the medium that wets the bore.
2
Fix the Standard
Choose between B165 or B163 seamless and B725 or B730 welded product.
3
Confirm the Condition
Annealed delivery suits most duties, and each welded length takes an anneal once the seam cools.
4
Agree the Test Scope
Then we fix hydrostatic, eddy-current, and PMI expectations in writing.
5
Review the Offer
The reply carries price, drawing route, test scope, documents, and an Incoterm.
6
Production and Testing
Afterwards the plant draws, welds, and examines each length to the agreed level.
7
Shipment
Certificates and export papers leave with the tubes, and we confirm the delivery terms beforehand.
What Our Clients Say
Feedback from buyers and engineers who source nickel alloy materials from Southerly Alloy.
★★★★★
“Seawater exchanger tube arrived with the eddy-current report our client asked for, and the U-bends matched the bundle drawing.”
★★★★★
“The HF line replacement came in short order, and the tube fitted the existing flanges without rework.”
★★★★★
“Wall tolerance on the small-diameter instrument tube held through three repeat orders.”
CERTIFICATIONS & QUALITY DOCUMENTATION
Certifications & Quality Documentation
Our production and inspection processes are certified to international standards, and every delivery ships with EN 10204 3.1 mill test certificates.
ISO 9001:2015
Quality Management System
PED 2014/68/EU
Pressure Equipment Directive
ASTM / ASME
Material Standards Compliance
EN 10204 3.1
Mill Test Certificates
FAQ
Frequently Asked Questions
Which standards cover Monel 400 pipe and tube?
B165 and B163 cover seamless product, while B725 and B730 cover welded pipe and tube. However, the ASME SB editions apply once the equipment falls under pressure-code jurisdiction.
Can you supply small-diameter Monel 400 tubing?
Yes. We draw instrument and capillary tube from 1.6 mm outside diameter, and wall tolerance follows the drawing you send.
Is the tube suitable for heat-exchanger service?
Yes. B163 tube comes straight, U-bent, or coiled, and each bundle carries the eddy-current or hydrostatic record named on the order.
Which filler metal suits tube welding?
ERNiCu-7 wire to AWS A5.14 and ENiCu-7 electrodes to A5.11 match the parent metal. Therefore, most joints need no post-weld heat treatment.
Can the tube run in seawater?
Yes, the grade performs well in flowing seawater. Still, stagnant water and crevices concentrate chlorides, so design those areas with a flow review in hand.
What is your MOQ for Monel 400 pipe?
One length covers most stock sizes, and we quote trial quantities without a minimum premium.
What are your trade terms for Monel 400 pipe?
FOB suits most orders, and EXW, CIF, or DAP come into play once we know the destination.
How is the tube priced?
The quotation follows weight in kilograms, with the copper share set on the order date.
What is the lead time for this tube?
Stock sizes leave in 7-15 days, and made-to-order bundles get a confirmed schedule date.
Do you provide EN 10204 3.1 or 3.2 certificates?
Yes. An EN 10204 3.1 certificate accompanies every consignment, and we arrange 3.2 third-party endorsement when you ask.
REQUEST FOR QUOTATION
Need A Custom Alloy Solution?
Send the outside diameter, wall, length, quantity, and the medium that wets the bore. Therefore, the reply carries price, drawing route, test scope, documents, and an Incoterm.
