Monel® 400 Alloy Plate | Superior Corrosion Resistance in Marine & Acidic Environments

✓ Seawater Invincibility: Resists pitting, crevice corrosion, and biofouling in seawater at 0.002mm/year corrosion rate.

✓ Acid Resistance: Withstands 70% sulfuric acid at 50°C (122°F) and hydrofluoric acid vapors.

✓ Thermal Conductivity: Maintains strength from -100°C to 480°C (-148°F to 896°F) for heat exchanger applications.

✓ Machinability: Cold-rolled to ±0.5% thickness tolerance with excellent weldability (ENiCu-7 filler recommended).

Monel® 400 Alloy Plate (UNS N04400)

Engineered to dominate marine and chemical processing applications, Monel® 400 alloy plate combines a nickel-copper matrix (Ni-63%, Cu-30%) to deliver unmatched resistance to seawater corrosion, sulfuric/hydrochloric acids, and alkaline solutions. Certified to ASTM B127, ASME SB-127, and NACE MR0175, this alloy outperforms stainless steels in chloride-rich environments while offering cost-effective durability for offshore, chemical, and oil & gas industries.

Thickness Range: 3mm–150mm (hot-rolled) / 0.5mm–12mm (cold-rolled)
Surface Finishes: Pickled, Grinded (Ra ≤1.6μm), Electropolished (Ra ≤0.4μm)
Mechanical Properties: Yield Strength ≥240 MPa | Tensile Strength ≥550 MPa | Elongation ≥35% | Hardness ≤200 HBW

Parameter Category	Value/Description
Material Standard	ASTM B127, ASME SB127, 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), and alkaline solutions. Resists chloride-induced stress corrosion cracking (SCC) and pitting.
Heat Treatment	Annealing: 870–980°C followed by rapid cooling (water or air).
Surface Finishes	Hot-rolled, Cold-rolled, Annealed & Pickled, Ground, Polished (Ra ≤0.8μm).
Plate Dimensions	– Thickness: 3mm–200mm – Width: 1000mm–3000mm – Length: 2000mm–12000mm (customizable).
Key Applications	Marine engineering, chemical processing equipment, oil & gas pipelines, heat exchangers, pump shafts, seawater valves.

Monel® 400 Alloy Plate (UNS N04400) Applications

Industry	Critical Use Cases	Monel® 400 Advantage
Marine Engineering	Seawater pumps, propeller shafts, hulls	0.001mm/year corrosion rate in 3.5% NaCl seawater.
Chemical Processing	Sulfuric acid storage tanks, HF alkylation	Resists 50% H₂SO₄ + 10% HF at 60°C (140°F).
Oil & Gas	Offshore platform components, valves	Survives H₂S >1,000 ppm + CO₂ at 120°C (248°F).
Power Generation	Heat exchanger tubes, condenser plates	Immune to steam erosion at 400°C (752°F).

Monel® 400 Alloy Plate (UNS N04400) Product Packaging

Monel 400/K500 alloy plates (UNS N04400/N05500, ASTM B865/ASME SB-865 compliant) deliver exceptional resistance to seawater corrosion, sulfuric acid, and high-velocity steam. To preserve their marine-grade integrity from mill to project site, we implement specialized packaging systems and logistics protocols certified to NACE MR0175 and DNVGL-RU-SHIP standards.

Why Choose Us

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