N05500 is a nickel-copper alloy, also commonly known by its trade name Monel 500. It is part of the Monel family of alloys, which are primarily composed of nickel (Ni) and copper (Cu), with small additions of other elements to enhance specific properties.
Monel 500 (N05500) is valued for its excellent corrosion resistance in a wide range of environments, including seawater, acidic solutions, and alkaline media. It also offers good mechanical strength and toughness, even at elevated temperatures, making it suitable for applications in marine engineering, chemical processing, oil and gas industries, and aerospace components.
This alloy is often chosen for its resistance to stress corrosion cracking and pitting, which are critical in harsh service conditions. It is available in various forms, such as sheets, plates, bars, pipes, and forgings, to accommodate diverse manufacturing needs.
The chemical composition of N05500 (Monel 500) is defined by standards such as ASTM B164 (for nickel-copper alloy plate, sheet, and strip) and ASTM B165 (for nickel-copper alloy seamless pipe and tube). The typical composition ranges are as follows:
Nickel (Ni): 63.0% minimum (balance, including cobalt, which is often considered part of the nickel content in specifications).
Copper (Cu): 28.0–34.0%.
Iron (Fe): 2.0% maximum.
Manganese (Mn): 1.5% maximum.
Silicon (Si): 0.5% maximum.
Carbon (C): 0.3% maximum.
Sulfur (S): 0.024% maximum.
These elements work together to balance corrosion resistance, strength, and fabricability. The high nickel content contributes to corrosion resistance, while copper enhances ductility and machinability. Small amounts of iron and manganese improve strength and resistance to oxidation.
The mechanical properties of N05500 (Monel 500) vary slightly depending on the heat treatment and form (e.g., annealed, cold-worked). Below are the typical properties for annealed material, as specified in relevant standards:
Tensile Strength: 485–655 MPa (70,000–95,000 psi).
Yield Strength (0.2% offset): 170–275 MPa (25,000–40,000 psi).
Elongation (in 50 mm): 30–45% (measures ductility; higher values indicate greater ability to deform before fracture).
Hardness (Brinell): 110–150 HB (annealed condition).
For cold-worked (hardened) forms, the mechanical properties are significantly higher:
Tensile Strength: Up to 965 MPa (140,000 psi).
Yield Strength (0.2% offset): Up to 795 MPa (115,000 psi).
Elongation: Reduced to around 5–15% (due to increased hardness from cold working).
Additionally, N05500 maintains good mechanical stability at elevated temperatures, with tensile strength remaining relatively consistent up to 300°C (572°F). It also exhibits low magnetic permeability, which is advantageous in applications requiring non-magnetic materials.
These properties make N05500 a versatile alloy for components subjected to both mechanical stress and corrosive environments.
