Monel® 400 Alloy Pipe | Superior Corrosion Resistance for Marine & Harsh Chemical Environments
✓ Seawater Invincibility: 0.002mm/year corrosion rate in seawater, resisting pitting, crevice corrosion, and biofouling.
✓ Acid Resistance: Withstands 70% sulfuric acid at 50°C (122°F) and hydrofluoric acid vapors – ideal for chemical processing.
✓ Thermal Stability: Maintains strength from **-100°C to 480°C (-148°F to 896°F)** for extreme temperature applications.
✓ Ease of Fabrication: Seamless and welded pipes with **±1% OD/ID tolerance** and Ra ≤0.8μm internal finish for high-purity fluid transport.
Monel® 400 Alloy Pipe (UNS N04400)
Engineered to excel in marine, chemical, and oil & gas applications, Monel® 400 alloy pipe combines a nickel-copper matrix (Ni-63%, Cu-30%) to deliver unmatched resistance to seawater corrosion, sulfuric acid, hydrofluoric acid, and alkaline solutions. Certified to ASTM B165, ASME SB-165, and NACE MR0175, this alloy outperforms stainless steels in chloride-rich environments while offering cost-effective durability for offshore, chemical, and sour gas industries.
- Sizes: OD 6mm–600mm | Wall Thickness 1mm–50mm
- Surface Finishes: Pickled, Electropolished (Ra ≤0.4μm), Bead-Blasted
- Mechanical Properties: Yield Strength ≥240 MPa | Tensile Strength ≥550 MPa | Elongation ≥35% | Hardness ≤200 HBW
| Parameter Category | Value/Description |
|---|---|
| Material Standard | ASTM B165 (Seamless), ASTM B725/B751 (Welded), ASME SB165, 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 | Excellent resistance to seawater, hydrofluoric acid (HF), sulfuric acid (H₂SO₄), alkaline solutions, and chloride-induced stress corrosion cracking (SCC). Vulnerable to oxidizing acids (e.g., HNO₃). |
| Heat Treatment | Annealing: 870–980°C followed by rapid cooling (water or air). |
| Surface Finishes | Pickled, Polished (ID/OD), Bright Annealed (BA), or as per ASTM standards. |
| Pipe Dimensions | – OD: 1/8″ to 24″ (Seamless/Welded) – Wall Thickness: SCH 5S to SCH XXS – Length: Random or Cut Length (up to 12m). |
| Key Applications | Marine engineering pipelines, chemical processing equipment, oil & gas valves, heat exchanger tubes, seawater cooling systems. |
Monel® 400 Alloy Pipe (UNS N04400) Applications
| Industry | Critical Use Cases | Monel® 400 Advantage |
|---|---|---|
| Marine Engineering | Seawater cooling systems, propeller shafts | 0.001mm/year corrosion rate in 3.5% NaCl seawater at 30°C. |
| Chemical Processing | Sulfuric acid pipelines, HF alkylation units | Resists 50% H₂SO₄ + 10% HF at 60°C (140°F). |
| Oil & Gas | Offshore platform piping, sour gas scrubbers | Survives H₂S >1,000 ppm + CO₂ at 120°C (248°F). |
| Power Generation | Heat exchanger tubing, condenser systems | Immune to steam erosion at 400°C (752°F). |
Monel® 400 Alloy Pipe (UNS N04400) Product Packaging
Monel® 400 Alloy Pipe (UNS N04400) (UNS N04400/N05500, ASTM B165/ASME SB-165 compliant) excel in seawater, hydrofluoric acid, and high-temperature steam environments. To ensure pristine condition from factory to harsh operational sites, we implement military-grade packaging systems and logistics protocols certified to NACE MR0175, DNVGL-RP-0419, and IMO MSC.245(83) standards.
PE Shrink Wrapping
Each pipe is wrapped in 200μm polyethylene film to block moisture, dust, and UV exposure.
End Caps
Plastic/rubber caps on both ends to prevent dents, debris ingress, and thread damage.
Shock-Absorbing Bundling
Steel-Strapped Wooden Pallets: Heavy-duty pallets with non-slip rubber mats (Max load: 5 tons).
Laser-etched QR codes
- PMI (Positive Material Identification) reports - Hydrostatic test certificates (per ASME B31.3) - EN 10204 3.1 material traceability
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 Pipe (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: How does Monel 400 compare to stainless steel 316L in seawater?
A: Monel 400 offers 10x lower corrosion rates in seawater and superior resistance to biofouling, making it ideal for marine and offshore applications.
Q2: What welding techniques prevent intergranular corrosion?
A: Use ENiCu-7 electrodes (SMAW) or ERNiCu-7 filler (TIG) with 0.8–1.2 kJ/mm heat input, avoiding prolonged exposure to 425–870°C (797–1600°F).
Q3: Are pipes 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 minimum order quantity (MOQ)?
Standard stock: 1000 kg MOQ.
Custom sizes/heat treatments: 5 tons MOQ (lead time 25 days).
Q5: How to verify material authenticity?
Scan Blockchain NFC tags with MonelVerify™ app to access:
- XRF validation against PMI certificates
- Third-party SGS/BV inspection reports
- Blockchain-based production records
BLOG CONTENT
Contact us by e-mail or whatsapp, 24 hours online.
- For construction companies, engineering contractors
- For buyers/wholesalers/trading companies
- For manufacturers
- Please fill out the form so we can contact you and help you.
- Enter your email (required)
- Write your inquiry or product request (required)
- Fill in your name and phone number (optional)
- Click “Submit After Filling”
- EMAIL : leoris@hanyu-cn.com
- We’ll reply within 2 hours (24/7 online via email & WhatsApp)