UNS N04400 (Monel 400)
Generic Name & Other Designation
Monel 400, Alloy 400, Nickel-Copper Alloy 400,W.Nr. 2.4360, W.Nr. 2.4361, NiCu30Fe
Product Overview
UNS N04400 (Monel 400) is a single-phase binary nickel-copper solid-solution alloy offering a unique balance of mechanical strength and toughness over a wide temperature scale. Renowned for its versatile performance in aquatic and chemical settings, UNS N04400 exhibits high resistance to neutral and alkaline salts, as well as deaerated reducing acids.
It remains a primary choice for marine engineering and offshore crude oil extraction where stress-corrosion cracking resistance is critical.
Key Highlights
✅ Brine & Seawater Defense: Exceptional resistance to rapidly flowing seawater and marine biofouling.
✅ Hydrofluoric Acid Immunity: Outstanding durability across all concentrations of hydrofluoric acid up to boiling point.
✅ Magnetic Nature: Slightly magnetic at room temperature, losing magnetism at slightly elevated temperatures.
✅ High Thermal Conductivity: Superior heat transfer efficiency compared to chromium-bearing nickel alloys.
Chemical Composition & Physical Properties
Chemical Composition (wt%)
Element | Content (%) |
Nickel (Ni) | ≥ 63.0 |
Copper (Cu) | 28.0 – 34.0 |
Iron (Fe) | ≤ 2.5 |
Manganese (Mn) | ≤ 2.0 |
Carbon (C) | ≤ 0.3 |
Silicon (Si) | ≤ 0.5 |
Sulfur (S) | ≤ 0.024 |
Physical & Mechanical Properties
Parameter | Value |
Density | 8.80 g/cm³ |
Melting Range | 1300°C – 1350°C |
Yield Strength (0.2%, Annealed) | ≥ 240 MPa |
Tensile Strength (Annealed) | ≥ 480 MPa |
Elongation | ≥ 35% |
Available Forms
Tubing & Pipe: Marine seamless pipes, heat exchanger tubes, condenser coils.
Plates & Sheets: Structural hull plates, vessel linings, cladding materials.
Round Bar & Shafts: Propeller shafts, pump impellers, tie rods.
Fasteners & Valves: Screws, bolts, valve trim, pump internals.
Typical Application Scenarios
Marine Engineering: Propeller shafts, seawater piping systems, splash zone sheathing on offshore rigs.
Chemical Manufacture: Hydrofluoric acid alkylation units, salt production evaporators.
Oil & Gas Processing: Crude distillation towers, boiler feedwater heaters, process piping.
Quality Assurance & Testing
100% Ultrasonic non-destructive examination (NDE) and hydro-testing.
Mechanical tensile and hardness testing per ASTM E8.
EN 10204 3.1 Material Test Certificates provided for full heat number traceability.
Supplier Information (BELNADE)
Supplied by BELNADE, a premier global supplier of marine-grade and chemical-resistant nickel-copper alloys. BELNADE provides custom shaft machining, precision plate cutting, and global export logistics.
Partner with BELNADE for High-Grade Alloy Solutions
📧 Email: info@belnade-material.com
🌐 Website: www.belnade-material.com
💬 Mobile/ WhatsApp: +86 158-0040-6687