MONEL® Alloy R-405

Quality Commitment

MONEL® ALLOY R-405

The free-machining version of MONEL alloy 400. A controlled amount of sulfur is added to the alloy to provide sulfide inclusions that act as chip breakers during machining. Other characteristics are essentially the same as those of MONEL alloy 400. Used for meter and valve parts, fasteners, and screw-machine products. Standard product forms are round, hexagon, flats, and wire.

Limiting Chemical Composition, %

Nia - 63.0 min.
Cu - 28.0-34.0
Fe - 2.5 max.
S - 0.025-0.060
Mn - 2.0 max.
C - 0.3 max.
Si - 0.25-0.060
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aPlus Co.

Typical Mechanical Properties (Annealed)

Tensile Strength, psi •••••• 80,000
MPa •••••• 550
Yield Strength(0.2%Offset), psi •••••• 35,000
MPa •••••• 240
Elongation,% •••••• 40

Physical Constants and Thermal Properties

Density, Ib/in3 •••••• 0.318
g/cm3 •••••• 8.80
Melting Range, °F •••••• 2370 – 2460
°C •••••• 1300 – 1350
Specific Heat, Btu/lb •°F •••••• 0.102
J/kg • °C •••••• 427
Curie Temperature, °F •••••• 70 – 120
°C •••••• 20 – 50
Coefficient of Expansion, 70 – 200°F, 10-6 in/in • °F •••••• 7.6
21 – 93°C, μm/m • °C •••••• 13.7
Thermal Conductivity, Btu • in/ft2•h•°F •••••• 151
W/m• °C •••••• 21.8
Electrical Resistivity, ohm• circ mil/ft •••••• 307
μΩ•m •••••• 0.510

Specifications and Designation

UNS N04405
ASTM B 164
ASME SB-164,
Boiler Code Sections III, VIII
SAE AMS 4674,
7234 QQ-N-281
NACE MR-01-75