Monel 400 Plate

• UNS N04400 nickel-copper alloy
• Excellent seawater and marine corrosion resistance
• Excellent resistance to hydrofluoric acid
• Strong resistance to alkaline environments
• Good resistance to chloride-containing environments
• High strength and toughness
• Good mechanical properties at subzero and elevated temperatures
• Excellent resistance to stress-corrosion cracking in many environments
• Suitable for chemical and petrochemical processing
• Available with applicable material certification and COA/MTR
• ASTM and ASME specifications available as applicable

Property	Typical Specification
Product Name	Monel 400 Plate
Alloy	Monel 400
UNS Number	N04400
Common Designation	Alloy 400 / Ni-Cu 400
Nickel + Cobalt	≥63.0 wt%
Copper	28.0–34.0 wt%
Iron	≤2.5 wt%
Manganese	≤2.0 wt%
Carbon	≤0.30 wt%
Silicon	≤0.50 wt%
Sulfur	≤0.024 wt%
Density	~8.80 g/cm³
Melting Range	~1,300–1,350°C
Crystal Structure	Face-Centered Cubic (FCC)
Electrical Resistivity	~0.49 µΩ·m
Thermal Conductivity	~21.8 W/m·K
Corrosion Resistance	Excellent
Magnetic Behavior	Slightly magnetic depending on condition
Surface	Mill finish or processed finish as specified
Condition	Annealed, hot rolled, cold rolled, or as specified
Standard	ASTM/ASME specifications applicable to product form
Documentation	COA/MTR and SDS as applicable

Monel 400 / UNS N04400

The standard nickel-copper alloy 400 grade for general corrosion-resistant plate applications.

Annealed Monel 400 Plate

Commonly selected when improved ductility and formability are required.

Cold-Worked Monel 400 Plate

Available when higher mechanical strength and hardness are required.

ASTM/ASME Certified Monel 400 Plate

Material can be specified to applicable ASTM B127 or ASME SB-127 requirements with material test documentation as applicable.

1. What is Monel 400 plate?

Monel 400 plate is a nickel-copper alloy plate with UNS designation N04400. It provides excellent corrosion resistance combined with high strength and toughness.

2. What is the chemical composition of Monel 400?

Monel 400 contains primarily nickel and copper, with typical specification limits of approximately 63% minimum nickel plus cobalt and 28–34% copper. Iron, manganese, carbon, silicon, and sulfur are present in controlled amounts.

3. What is Monel 400 plate used for?

Typical applications include marine equipment, chemical processing equipment, heat exchangers, pumps, valves, oil and gas equipment, pressure vessels, hydrofluoric acid service, and seawater applications.

4. What ASTM specification covers Monel 400 plate?

ASTM B127 covers nickel-copper alloy plate, sheet, and strip, including UNS N04400. The corresponding ASME specification is SB-127.

5. Is Monel 400 resistant to seawater?

Yes. Monel 400 provides excellent resistance to seawater and marine environments, making it a widely used alloy for marine and offshore applications.

6. Can REG Metals supply certified Monel 400 plate?

Yes. REG Metals can source Monel 400 plate to applicable specifications and customer requirements. Material Test Reports (MTRs), Certificates of Analysis (COA), and other documentation may be available depending on the order and specification.