Monel® 400 Alloy Coil | Superior Corrosion Resistance for Marine & Chemical Applications
✓ Seawater Immunity: 0.002mm/year corrosion rate in seawater, resisting pitting, crevice corrosion, and biofouling.
✓ Acid Resistance: Withstands 70% H₂SO₄ at 50°C (122°F) and HF vapors – ideal for chemical equipment.
✓ Thermal Conductivity: Maintains structural integrity from -100°C to 480°C (-148°F to 896°F) for heat exchangers.
✓ Fabrication Precision: Cold-rolled to ±0.02mm thickness tolerance with Ra ≤0.8μm surface finish for seamless forming.
Monel® 400 Alloy Coil (UNS N04400)
Engineered to thrive in corrosive marine and chemical environments, Monel® 400 alloy coil combines a nickel-copper matrix (Ni-63%, Cu-30%) to deliver unmatched resistance to seawater, sulfuric acid, hydrofluoric acid (HF), and alkaline solutions. Certified to ASTM B164, ASME SB-164, and NACE MR0175, this alloy outperforms stainless steels in chloride-rich settings while offering cost-effective durability for offshore, chemical processing, and oil & gas industries.
- Thickness: 0.5mm–12mm (cold-rolled) / 3mm–25mm (hot-rolled)
- Width: 300mm–2,000mm (slitting tolerance ±0.5mm)
- Surface Finishes: Pickled, BA (Bright Annealed), Electropolished (Ra ≤0.4μm)
- Mechanical Properties: Yield Strength ≥240 MPa | Tensile Strength ≥550 MPa | Elongation ≥35%
| Parameter Category | Value/Description |
|---|---|
| Material Standard | ASTM B164 (Rod/Bar), ASTM B725 (Welded), ASME SB164, EN 2.4360 |
| Chemical Composition (%) | Ni 63–70, Cu 28–34, Fe ≤2.5, Mn ≤2.0, C ≤0.3, Si ≤0.5, S ≤0.024, Al ≤0.5, Ti ≤0.5 |
| Tensile Strength (MPa) | ≥480 (Annealed) |
| Yield Strength (MPa) | ≥170 (Annealed) |
| Elongation (%) | ≥35 (in 50mm gauge length) |
| Hardness | Brinell (HBW): ≤150; Rockwell (HRB): ≤80 (Annealed) |
| Density (g/cm³) | 8.80 |
| Melting Range (°C) | 1300–1350 |
| Thermal Conductivity (W/m·K) | 21.8 (at 20°C) |
| Thermal Expansion (10⁻⁶/°C) | 14.4 (20–100°C) |
| Electrical Resistivity (Ω·m) | 0.51 × 10⁻⁶ (at 20°C) |
| Elastic Modulus (GPa) | 179 |
| Magnetic Permeability | Non-magnetic |
| Corrosion Resistance | Exceptional resistance to seawater, hydrofluoric acid (HF), sulfuric acid (H₂SO₄), alkaline solutions, and chloride stress corrosion cracking (SCC). Avoid strong oxidizing acids (e.g., HNO₃). |
| Heat Treatment | Annealing: 870–980°C followed by rapid cooling (water or air). |
| Surface Finishes | Cold-rolled bright annealed (BA), Pickled & Passivated, Polished (Ra ≤0.6μm). |
| Coil Dimensions | – Thickness: 0.5mm–6.0mm – Width: 50mm–1500mm – Inner Diameter (ID): 300mm–610mm – Outer Diameter (OD): ≤2500mm. |
| Key Applications | Marine engineering components, chemical processing equipment, valve springs, heat exchanger fins, seawater pump shafts. |
Monel® 400 Alloy Coil (UNS N04400) Applications
| Industry | Critical Use Cases | Monel® 400 Coil Advantage |
|---|---|---|
| Marine Engineering | Seawater heat exchanger plates, hull cladding | 0.001mm/year corrosion rate in 3.5% NaCl seawater. |
| Chemical Processing | Sulfuric acid storage tanks, HF reactors | Resists 50% H₂SO₄ + 10% HF at 60°C (140°F). |
| Oil & Gas | Offshore platform components, scrubbers | Survives H₂S >1,000 ppm + CO₂ at 120°C (248°F). |
| Power Generation | Condenser coils, desalination plant parts | Immune to steam erosion at 400°C (752°F). |
Monel® 400 Alloy Coil (UNS N04400) Product Packaging
Monel® 400 Alloy Coil (UNS N04400) (UNS N04400/N05500, ASTM B865/ASME SB-865 compliant) are engineered for superior performance in seawater, sulfuric acid, and high-temperature steam environments. To ensure flawless coil integrity and surface quality during global transit, we deploy advanced packaging systems and logistics protocols tailored for coiled products, meeting NACE MR0175, DNVGL-RP-0419, and IMO standards.
Anti-rust packaging
VCI gas phase anti-rust film + desiccant (12 months moisture-proof for sea transportation)
Reinforcement method
Steel strapping + wooden pallet (load-bearing ≤ 5 tons)
Surface protection
Polyethylene film layered isolation (anti-scratch)
Customization options
IPPC fumigation wooden box (compliant with ISPM15 standard)
Why Choose Us
Where Precision Meets Partnership，25 years of focus on metal material science，Not only a supplier, but also your engineering consultant，Fast and zero compromise，Sustainable trust cycle。
Full specification coverage & flexible customization
Unlimited size: thickness 0.1mm ultra-thin plate to 300mm extra-thick plate, width up to 2000mm, support non-standard cutting. Various surface treatments: 2B, BA mirror, brushed (No.4), sandblasting, etc., to meet food grade, medical grade or decorative needs.
Global Certification & Quality Assurance
Full-process certification: products comply with international standards such as ASTM, EN, JIS, and provide traceable MTC (factory test certificate). Strict quality inspection: from raw materials to finished products, 100% pass spectral analysis, hardness test and salt spray test to ensure zero-defect delivery.
Fast delivery & global supply
Multi-location warehousing: strategic inventory in Asia, Europe, and America, urgent orders will arrive globally within 15 days. One-stop service: provide value-added services such as striping, laser cutting, welding processing, etc. to shorten customer production cycle.
Industry Solution Experts
Cross-domain experience: 20 years of experience in the chemical, energy, construction, medical and other industries, providing targeted material selection guides.
Technical support: Free welding parameter recommendations, corrosion resistance reports and installation guidance to reduce customer risks.
Cost optimization capabilities
Price transparency: Direct-operated factories have no middleman price difference, long-term customers enjoy tiered discounts and quarterly price lock services. Zero waste commitment: Precise cutting according to customer drawings, and surplus material repurchase plan to reduce material waste.
Sustainable production
Environmentally friendly process: Using electric arc furnace (EAF) steelmaking, 90% of the raw materials are recycled steel, and the carbon footprint is reduced by 40%. Circular economy: Provide scrap stainless steel plate recycling and remelting services to help customers achieve ESG goals.
Monel® 400 Alloy Coil (UNS N04400) Shipping
Sea transport
40HQ container (loading capacity 28 tons) / bulk carrier (LCL minimum 1 ton)
Air transport
reach major airports around the world within 7 days (DDP/DAP terms)
Land transport
door-to-door within China (qualification for dangerous goods transportation)
Our Services
We guarantee global door-to-door delivery within 7–15 business days via partnerships with DHL, Maersk, and UPS.
FAQ
Q1: Why choose Monel 400 over stainless steel 316L in marine environments?
A: Monel 400 offers 10x lower corrosion rates in seawater and superior biofouling resistance, making it ideal for offshore and desalination systems.
Q2: What welding filler is recommended for Monel 400 coils?
A: Use ENiCu-7 electrodes (SMAW) or ERNiCu-7 filler (TIG) with 0.8–1.2 kJ/mm heat input to avoid intergranular corrosion.
Q3: Are coils certified for sour gas service?
Full compliance includes:
- NACE MR0175/ISO 15156-3
- ASME B31.3 for process piping
- ASTM G48 Method A pitting corrosion testing
Q4: What’s the MOQ for custom electropolished coils?
Standard stock: 5 ton MOQ.
Custom specs: 10 tons MOQ (lead time 30 days).
Q5: How to verify material authenticity?
Scan Laser-Matrix Codes under UV light or use MonelVerify™ app to access:
- Real-time PMI (Positive Material Identification)
- Third-party SGS/BV inspection reports
- Blockchain-validated production records
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