ThePipingMart Blog Grades 502 Monel Alloy (UNS N05502) – Properties, Uses and Composition

502 Monel Alloy (UNS N05502) – Properties, Uses and Composition

Monel 502

UNS N05502 is a nickel-copper alloy that combines corrosion resistance with strength. It can be used in various applications, such as in marine environments, chemical plants, and heat exchangers. In this blog post, we will look at the composition of Monel 502, its chemical and mechanical properties, its physical properties, uses, corrosion resistance, heat resistance, heat treatment processes, machining requirements, and welding techniques.

502 Monel Composition

UNS N05502 is composed of 50% nickel and 47% copper with other trace elements, including manganese (2%), iron (0.5%), silicon (0.3%) and carbon (0.1%). This combination of metals creates an alloy that is highly resistant to corrosion when exposed to saltwater or other harsh chemicals. Additionally, the alloy maintains strength even at high temperatures due to its high ratio of nickel.

Element Content (%)
Nickel , Ni 63-70
Aluminum, Al 2.5-3.5
Iron, Fe 2 max
Manganese, Mn 1.5 max
Titanium, Ti 0.5 max
Silicon, Si 0.5 max
Carbon, C 0.1 max
Sulfur, S 0.01 max
Copper, Cu Remainder

502 Monel Mechanical Properties

UNS N05502 has excellent chemical and mechanical properties for a variety of applications due to its composition of nickel and copper. The alloy has an ultimate tensile strength of 35 ksi (241 MPa) as well as great corrosion resistance in both acidic and alkaline environments. Additionally, it has good ductility and weldability, which makes it suitable for many different types of operations.

Properties Metric Imperial
Tensile strength 1158 MPa 167954 psi
Yield strength 1034 MPa 149969 psi
Elastic modulus 190-210 GPa 27557-30458 ksi
Poisson’s ratio 0.27-0.30 0.27-0.30
Elongation 15% 15%
Reduction of area 53% 53%
Hardness 335 335

Monel 502 Physical Properties

The physical properties of Monel 502 are determined by its composition as well as other factors such as temperature or pressure. The most notable physical property is its density which is 8.8 g/cm3 at room temperature making it heavier than most other alloys but still relatively light compared to steel or cast iron alloys. Its electrical conductivity is also very low at about 1/4th that of pure copper thanks to the presence of nickel in the alloy, which helps insulate it from electricity better than pure copper would be able to do alone.

Properties Metric Imperial
Density 7.7-8.03 g/cm³ 0.278-0.290 lb/in³
Melting point 1330°C 2425°F

502 Monel Thermal Properties

Properties Metric Imperial
Thermal conductivity 42.7 W/mK 296 BTU in/hr.ft².°F

502 Monel Equivalent

  • AMS 4677

Monel 502 Uses 

UNS N05502 is popular because it offers many different uses that make it a desirable material for engineers looking for a specific application from their materials choice. It can be used in applications such as marine engineering due to its excellent corrosion resistance when exposed to saltwater or other harsh chemicals found in this environment; it can also be used in pressure vessels due to its ability to maintain strength even at high temperatures; and finally it can be used in heat exchangers where its thermal conductivity helps transfer heat efficiently while maintaining structural integrity over time with no deterioration even under extreme conditions like those found inside a boiler or furnace chamber that are regularly exposed to high temperatures over long periods of time without any signs of failure or wear on the material itself.

Corrosion Resistance

One key feature that makes Monel 502 so desirable for many applications is its excellent corrosion resistance when exposed to saltwater or other harsh chemicals found in marine environments or industrial applications like chemical plants .

Heat Resistance

The alloy also has great heat resistance due to nickel, which helps maintain strength even at extremely high temperatures, making it ideal for use inside boilers or furnaces where temperatures regularly exceed 3000°F (1649°C).

Heat Treatment

502 Monel does not require any specialized heat treatment processes before use however, if desired, annealing may be done after machining operations have been completed on parts made out of this alloy .

Machining Requirements

Machining operations should typically involve using cutting tools with higher hardness ratings, such as cobalt-based tools, rather than standard HSS tools if possible, since they will last longer before needing replacement during production runs. When creating threads on parts made out of this material, thread inserts should always be used rather than cutting threads directly into the part itself since doing so can cause permanent damage resulting from excessive friction between tooling used during production runs.

Welding Techniques

Special precautions must always be taken when welding parts made out of metal alloys like Alloy 502 since these alloys are incompatible with traditional welding techniques. Specialized filler materials should always be used when welding parts made out of this type and certain pre-heating processes depending on the joint being welded together. For instance, butt joints require pre-heat up to 400°F while lap joints only need 300°F pre-heat before welding begins. Additionally, special attention must be paid to shield gas selection since incorrect shielding gas can lead to porosity issues during welds, causing oxygen contamination within weld puddles resulting poor quality welds overall.


Monel 502 is an incredibly useful yet versatile nickel-copper alloy that provides exceptional mechanical strengths and superior corrosion protection, making it ideal for many industry applications ranging from marine engineering pressure vessels, heat exchangers, automotive components, and food processing industries. By understanding the composition chemistry behind this particular type of metal, engineers can select the best option for their current project needs, knowing that their material choice is reliable, durable, long-lasting, and lasting service without degradation failure over time.

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