Alloy Grades
Your Current Location： Home >> Alloy Grades >> Monel >> Tube/Pipe
MONEL 400（UNSN04400） PIPE / TUBE
Nickel-Copper Alloy for Seawater, Hydrofluoric Acid & Reducing Media Service
MONEL 400 pipe and tube (UNS N04400) provides excellent corrosion resistance in flowing seawater and brine, and outstanding resistance to hydrofluoric acid, making it a preferred material for condensers, heat exchangers, seawater piping, and chemical process lines.
As a professional Chinese nickel-based alloy manufacturer, we supply MONEL 400 pipe and tube with stable chemistry, consistent mechanical properties, and flexible dimensional customization for global industrial users.
Typical supply range (custom sizes and tolerances available upon request):
Item | Range / Options | Notes |
Outside Diameter (OD) | 6 – 600 mm | Tube or pipe per project; NPS/DN on request. |
Wall Thickness (WT) | 0.5 – 30 mm | Define tolerance if critical. |
Length | Up to 12000 mm | Random / fixed length available by agreement. |
Type | Seamless / Welded | ASTM B165 (seamless); ASTM B725 (welded) per requirement. |
Surface finish | Pickled / Bright / Polished | ID/OD finish by agreement. |
End | Plain / Beveled | End prep available for welding and assembly. |
Delivery condition | Annealed (standard) | Additional NDT/testing per project requirement. |
Dimension definition: OD × WT × LENGTH.
• Excellent corrosion resistance in flowing seawater and brackish water
• Outstanding resistance to hydrofluoric acid (HF) across wide concentrations
• Good resistance to alkalis, neutral salts, and many reducing media
• Resistant to stress corrosion cracking in most fresh and industrial waters
• High strength and toughness; remains ductile at subzero temperatures
• Can be strengthened by cold working; good fabrication and weldability
Element | Ni | Cu | Fe | Mn | Si | C | S | Others |
MONEL 400 | ≥63.0 | 28.0–34.0 | ≤2.50 | ≤2.00 | ≤0.50 | ≤0.30 | ≤0.024 | — |
Alloy 400 is a Ni-Cu solid-solution alloy (non age-hardenable) that can only be strengthened by cold working; controlled chemistry supports stable corrosion performance.
Property | Value |
Tensile Strength (Rm) | ≈ 517–620 MPa (annealed) |
Yield Strength (Rp0.2) | ≈ 172–345 MPa (annealed) |
Elongation | ≈ 35–60 % |
Hardness | ≈ 60–80 HRB |
Mechanical properties may vary slightly with product form and heat treatment condition.
Standard System | Specification |
ASTM / ASME | ASTM B165 / ASME SB-165 (seamless); ASTM B725 (welded) |
EN | EN 10204 |
UNS | N04400 |
DIN | 2.4360 |
JIS | NW 4400 |
Item | Range |
OD | 6 – 600 mm |
WT | 0.5 – 30 mm |
Length | up to 12000 mm |
Type | Seamless / Welded |
End | Plain / Beveled |
Custom sizes, tight tolerances, and cut-to-length service are available upon request.
• Solution Annealed
• Bright Annealed / Pickled (where applicable)
• Condenser and heat-exchanger tubing
• Seawater and brine piping systems
• Chemical process lines in reducing environments
• Hydrofluoric acid (HF) service piping and equipment
MONEL 400 can be readily fabricated and welded using standard nickel-alloy practices.
Common welding methods include:
• GTAW (TIG)
• GMAW (MIG)
• SMAW
Matching filler metals such as ERNiCrMo-2 are typically recommended.
• EN 10204 3.1 Material Test Certificate
• Chemical composition analysis
• Mechanical testing (tensile, hardness)
• PMI / XRF testing available
• Dimensional inspection
• Third-party inspection on request (BV, SGS, TUV, DNV)
• PVC protective film on surface (where applicable)
• Wooden pallets or export-grade crates
• Seaworthy packaging for long-distance shipment
• Global delivery by sea, air, or multimodal transport
• Professional nickel-based alloy manufacturer in China
• Stable raw material sourcing and melting control
• Wide stock and fast production cycle
• Competitive pricing for global projects
• Experience with international EPC, OEM, and distributors
For quotation or technical consultation, please provide:
• Required grade (MONEL 400)
• OD × WT × Length
• Quantity
• Surface finish / delivery condition
• Application environment
Our technical team will respond with datasheets, pricing, and delivery schedule promptly.
