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MONEL 400（UNSN04400） Bar/Rod
Nickel-Copper Alloy for Seawater, Hydrofluoric Acid & Reducing Media Service
MONEL 400 bar is a nickel-copper solid-solution alloy (UNS N04400) offering strong resistance to seawater and many reducing chemicals, together with good mechanical properties and machinability. It is widely used for shafts, valve stems, pump parts, fasteners, and marine hardware in corrosive service.
As a professional Chinese nickel-based alloy manufacturer, we supply MONEL 400 bar 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 |
Diameter | 6 – 450 mm | Round bar standard; square/flat/hex available by request. |
Length | Up to 6000 mm | Cut-to-length (sawing) by agreement; define tolerance if critical. |
Shape | Round / Square / Flat / Hex | Forged / hot-rolled / cold-drawn per size requirement. |
Surface finish | Black / Peeled / Ground / Polished | Surface machining available for tight tolerance. |
End | Saw-cut / Facing / Chamfer | End prep available for machining and assembly. |
Straightness / tolerance | Per ASTM/EN or as agreed | Define straightness for long shafts and precision parts. |
Delivery condition | Annealed (standard) | Annealed & pickled/bright depending on size/finish. |
Dimension definition: DIA × 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 B164 / ASME SB-164 |
EN | EN 10204 |
UNS | N04400 |
DIN | 2.4360 |
JIS | NW 4400 |
Item | Range |
Diameter | 6 – 450 mm |
Length | Up to 6000 mm |
Shape | Round / Square / Flat / Hex |
Surface Finish | Black / Peeled / Ground / Polished |
End | Saw-cut / Facing / Chamfer |
Custom sizes, tight tolerances, and cut-to-length service are available upon request.
• Solution Annealed
• Bright Annealed / Pickled (where applicable)
• Pump shafts, impellers, and wear rings
• Valve stems, seats, and marine hardware
• Fasteners, bolts, and machined components
• Chemical processing parts requiring seawater/HF resistance
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)
• Diameter × Length
• Quantity
• Surface finish / delivery condition
• Application environment
Our technical team will respond with datasheets, pricing, and delivery schedule promptly.
