Monel K-500 Superalloy
K-500 typically refers to Monel K-500, a precipitation-hardening nickel-copper alloy that combines excellent corrosion resistance with high strength and hardness. Below is a detailed introduction:
Chemical Composition
It mainly contains approximately 63% nickel (including cobalt), 27%-33% copper, along with 0.25% carbon, 1.5% manganese, 2% iron, 2.30%-3.15% aluminum, and 0.35%-0.85% titanium.
Physical Properties
Density: Approximately 8.80 g/cm³
Elastic Modulus: 26,000 ksi
Electrical Resistivity: 5.11×10⁻⁵ ohm-cm
Melting Point: 1300-1350°C
Magnetic Property: Low magnetic permeability; non-magnetic below -101°C
Mechanical Properties
After precipitation hardening treatment:
At room temperature: Tensile strength can reach 1100 MPa; yield strength (0.2% offset) is 790 MPa.
At 425°C: Tensile strength is 860 MPa; yield strength is 630 MPa.
Performance Characteristics
Corrosion Resistance: Comparable to Monel 400, with excellent resistance to a wide range of media, from pure water to high-concentration salt solutions and alkaline solutions. It is nearly immune to chloride-induced stress corrosion cracking. However, in the precipitation-hardened state, it is more sensitive to stress corrosion cracking caused by hot hydrofluoric acid vapor.
Low-Temperature Performance: Maintains good plasticity and toughness at low temperatures while retaining high strength.
Processing Performance
Compared to other high-temperature alloys, K-500 is easy to process and can be fabricated into various forms such as bars, plates, tubes, and wires. Welding is generally performed in the quenched state, and in-situ stress must be eliminated before aging.
Application Fields
Widely used in chemical, petroleum, and papermaking industries, such as chemical pump shafts and impellers, oil well drill collars, and papermaking doctor blades.
Applied in marine engineering for manufacturing maritime fasteners, propeller shafts, etc.
Used in the production of electronic components and sensors.