MONEL® alloy 404 is a nickel-copper alloy renowned for its excellent corrosion resistance and high strength, particularly in marine environments. This product introduction covers its chemical composition, mechanical properties, performance across different temperatures, industry applications, shapes, sizes, production standards, welding, machining, polishing, heat treatment, cold working, advantages and disadvantages, and similar products.
Chemical Composition
Element
Composition (%)
Nickel (Ni)
52.5 min
Copper (Cu)
27.0-33.0
Iron (Fe)
1.0 max
Manganese (Mn)
1.5 max
Silicon (Si)
0.5 max
Carbon (C)
0.3 max
Sulfur (S)
0.02 max
Mechanical Properties
Property
Value
Tensile Strength (Annealed)
450 MPa (65 ksi) min
Yield Strength (Annealed)
170 MPa (25 ksi) min
Elongation (Annealed)
40% min
Hardness (Annealed)
70 HRB max
Performance at Different Temperatures
Temperature Range
Performance
Room Temperature
Excellent corrosion resistance, good mechanical properties
Elevated Temperatures (up to 300°C / 570°F)
Maintains strength and toughness
Cryogenic Temperatures
Retains ductility and toughness
Industry Applications
MONEL® alloy 404 finds applications in various industries for its corrosion resistance and mechanical properties:
Industry
Applications
Marine
Shipbuilding, seawater piping
Chemical Processing
Sulfuric acid production, chemical vessels
Aerospace
Aircraft components, fuel tanks
Oil & Gas
Valve trim, pump shafts
Shapes, Sizes, and Production Standards
Shapes and Sizes
Form
Size Range
Sheets
Thickness: 0.5 mm – 3 mm
Plates
Thickness: 1 mm – 50 mm
Bars
Diameter: 6 mm – 100 mm
Pipes
OD: 6 mm – 500 mm
Tubes
OD: 6 mm – 300 mm
Production Standards and Corresponding Grades
Country
Standard
Corresponding Grade
United States
ASTM B127, ASTM B164
UNS N04404
Germany
DIN 17750, DIN 17751
2.4867
France
AFNOR NFM 87-310
–
United Kingdom
BS 3072, BS 3073
NA12
Japan
JIS NW 4404
–
China
GB/T 12771, GB/T 12770
–
Welding, Machining, Polishing, Heat Treatment, and Cold Working
Process
Details
Welding
Welds with matching composition filler metals. Suitable methods include gas tungsten arc welding (GTAW) and gas metal arc welding (GMAW).
Machining
Requires sharp tools and proper cooling. Carbide tools are recommended for turning and milling operations.
Polishing
Achieves good surface finish with mechanical methods like buffing and polishing wheels. Chemical polishing is also effective.
Heat Treatment
Annealing at 870°C (1600°F) followed by water quenching improves ductility and removes residual stresses.
Cold Working
Can be cold worked to various degrees for shaping. Cold working increases strength and hardness.
Advantages and Disadvantages
Aspect
Advantages
Disadvantages
Advantages
Excellent corrosion resistance
Limited availability in certain forms
High strength and toughness
Machining can be challenging
Good ductility and toughness
Relatively high cost compared to some alternatives
Suitable for marine and chemical processing applications
Similar Products
Material Grade
Comparison
Alloy K-500
Similar composition with added aluminum and titanium for increased strength and hardness.
Conclusion
MONEL® alloy 404 is a versatile nickel-copper alloy ideal for applications requiring corrosion resistance and high strength in harsh environments. Its combination of mechanical properties and resistance to marine and chemical environments makes it suitable for a wide range of industries. Engineers and designers seeking a durable material with excellent performance characteristics can rely on MONEL® alloy 404 for dependable solutions.
For detailed technical specifications and customized solutions, consulting with material suppliers and referencing specific product data sheets is recommended.lting with material suppliers and referencing specific product data sheets is recommended.
