Monel 400 / K500 are nickel-copper alloys engineered to deliver exceptional resistance to corrosion, particularly in seawater, hydrofluoric acid, alkalis, and acidic environments. These alloys offer excellent mechanical strength, toughness, and resistance to stress corrosion cracking across a wide temperature range. Monel 400 provides outstanding corrosion resistance with good fabricability, while Monel K500 offers higher strength and hardness through age hardening, making it suitable for more demanding applications. Monel 400 / K500 maintain structural integrity under severe operating conditions, making them ideal for marine and offshore systems, chemical processing equipment, oil & gas components, pumps, valves, heat exchangers, and high-strength fasteners where durability and corrosion resistance are critical.
CHEMICAL COMPOSITION OF MONEL 400 / K500 ROUND BAR
Grade
Ni
Fe
C
Mn
Si
Cu
Al
Ti
S
Monel 400
63.0 – 70.0
2.5 max
0.30 max
2.0 max
0.50 max
Remainder
—
—
0.024 max
Monel K500
63.0 min
0.5 – 2.0
0.25 max
1.5 max
0.50 max
27.0 – 33.0
2.3 – 3.15
0.35 – 0.85
0.010 max
MECHANICAL PROPERTIES OF MONEL 400 / K500 ROUND BAR
Grade
Tensile Strength
0.2% Yield Strength
Elongation
Hardness (HRB)
Monel 400
75 – 90 ksi
25 – 50 ksi
35 – 60%
60 – 80
Monel K500
1100 MPa (160 ksi)
790 MPa (115 ksi)
20%
—
PHYSICAL PROPERTIES OF MONEL 400 / K500 ROUND BAR
Density @ Room Temperature
0.318 lb/in³
Elastic Modulus @ 70°F (Tension)
26.0 × 10⁶ psi
Specific Heat @ 70°F
0.102 Btu/lb/°F
Melting Point
2370°F – 2460°F
Thermal Conductivity @ 70°F
151 Btu·in/hr·ft²·°F
Electrical Resistivity @ 70°F
0.511 μΩ·m
💡 Practical Difference in Use
Use Monel 400 / K500 Round Bars when: exceptional resistance to seawater, hydrofluoric acid, alkalis, and corrosive environments is required along with high mechanical strength. Monel is a nickel-copper alloy known for outstanding corrosion resistance and excellent performance in marine and chemical applications.
→ Example: marine shafts, pump components, valves, offshore structures, chemical processing equipment, and heat exchangers.
Bright Finished / Machined Monel Round Bars when: tight dimensional tolerances, smooth surface finish, and precision machining are critical. Bright drawn or ground Monel bars improve machinability and ensure consistent mechanical properties.
→ Example: precision shafts, valve stems, fasteners, marine hardware, and CNC-machined components.
Applications of Monel 400 / K500 Round Bars
Monel round bars are extensively used in industries where corrosion resistance, strength, and durability are essential.
