Monel Alloy K-500
Monel Alloy K-500 Supplier in Tunisia
Introduction
Monel Alloy K-500 is a precipitation-hardenable nickel-copper alloy that combines the corrosion resistance associated with Monel 400 with significantly higher strength and hardness after suitable heat treatment. Identified by UNS N05500, the alloy contains nickel and copper with controlled additions of aluminium and titanium to enable precipitation hardening.
Monel K-500 is used in marine engineering, oil and gas equipment, pump shafts, valve components, fasteners, springs, and other applications requiring high mechanical strength and resistance to corrosion in suitable environments.
Emirerri Steel supplies industrial metal products and nickel alloys for customers in Tunisia, North Africa, and international markets, subject to availability and confirmation of the applicable product specifications.
Key Properties
- High mechanical strength: Offers significantly higher strength than Monel 400 after suitable precipitation-hardening treatment.
- Precipitation hardening: Aluminium and titanium contribute to increased strength and hardness during controlled ageing.
- Corrosion resistance: Performs well in many marine and selected industrial environments.
- Seawater resistance: Suitable for various marine components when operating conditions are compatible.
- Wear resistance: Increased hardness benefits selected mechanical applications.
- Low-temperature toughness: Retains useful toughness under appropriate service conditions.
- Machinability: Can be machined using methods suited to its strength and metallurgical condition.
- Industrial versatility: Used in mechanical components exposed to demanding loads and corrosive environments.
The actual performance of Monel K-500 depends on its heat-treatment condition, product form, operating temperature, chemical exposure, and applied mechanical loads.
Monel Alloy K-500 Chemical Composition
The following table presents commonly referenced composition limits. The exact requirements must be verified against the applicable product specification and material test certificate.
| Element | Composition (wt. %) |
|---|---|
| Nickel + Cobalt (Ni + Co) | 63.0 min |
| Copper (Cu) | 27.0–33.0 |
| Aluminium (Al) | 2.30–3.15 |
| Titanium (Ti) | 0.35–0.85 |
| Iron (Fe) | 2.0 max |
| Manganese (Mn) | 1.5 max |
| Silicon (Si) | 0.50 max |
| Carbon (C) | 0.25 max |
| Sulfur (S) | 0.010 max |
Note: These are commonly referenced limits. Confirm the precise chemistry requirements for the applicable standard and product form before procurement.
Monel Alloy K-500 Mechanical Properties
Monel K-500 develops its enhanced mechanical properties through precipitation hardening. The results depend on the manufacturing process, product dimensions, cold-working history, and heat-treatment cycle.
| Property | Indicative Value |
|---|---|
| Tensile Strength | Approximately 895–1,310 MPa |
| Yield Strength (0.2% offset) | Approximately 585–1,035 MPa |
| Elongation | Approximately 15–30% |
| Hardness | Depends on product form and heat treatment |
These figures are indicative reference ranges, not guaranteed acceptance values for every product. Use the governing specification and certified test results for engineering design and material inspection.
Monel Alloy K-500 Physical Properties
| Property | Approximate Value |
|---|---|
| Density | 8.44 g/cm³ |
| Melting Range | Approximately 1,315–1,350°C |
| Young’s Modulus | Approximately 179 GPa |
| Thermal Conductivity | Approximately 17 W/m·K |
| Thermal Expansion | Depends on the temperature range and material condition |
Physical properties can vary with temperature and metallurgical condition. Consult the relevant technical data when performing engineering calculations.
Standards and Specifications
The applicable specification depends on the product form, manufacturing route, and intended application.
| Standard / System | Designation or Application |
|---|---|
| UNS | N05500 |
| ASTM B865 | Specification covering Monel K-500 bars, rods, wire, forgings, and forging stock within its scope |
| AMS 4676 | Aerospace material specification for specified product forms |
| Werkstoff Number | 2.4375 |
| BS designation | NA18, a designation associated with the alloy |
For oil and gas applications, compliance with NACE MR0175 / ISO 15156 must be verified against the specific environment, material condition, hardness, and applicable requirements. The alloy designation alone does not establish compliance.
Always confirm the exact product standard, dimensions, heat-treatment condition, inspection requirements, and documentation before ordering.
Equivalent Grades
| Standard / System | Designation |
|---|---|
| UNS | N05500 |
| Werkstoff Number | 2.4375 |
| Commercial Designation | Monel K-500 |
| Alternative Name | Alloy K-500 |
| BS Designation | NA18, subject to the applicable product specification |
| Material Classification | Precipitation-hardenable nickel-copper alloy |
Equivalent designations should be verified against the governing product standard. Similar designations do not automatically guarantee full technical interchangeability.
Available Forms
Depending on manufacturing capability and availability, Monel K-500 may be supplied in the following forms:
- Monel K-500 round bars and rods
- Monel K-500 flat bars
- Monel K-500 wire
- Monel K-500 strips and other flat products, where specified
- Monel K-500 forgings
- Monel K-500 machined components
- Monel K-500 fasteners and special mechanical parts
The availability of sheets, plates, pipes, and tubes should be confirmed against the required product standard and supply capability. Dimensions, tolerances, heat-treatment condition, certification, and minimum order quantities must be confirmed during quotation.
Corrosion Resistance
Monel K-500 provides good corrosion resistance in many marine environments and selected chemical applications. Its corrosion performance is comparable to Monel 400 in numerous environments, while its precipitation-hardened condition provides enhanced mechanical strength.
The alloy is used in applications involving seawater and certain compatible chemical media. However, corrosion resistance depends on chemical concentration, temperature, flow velocity, aeration, deposits, and mechanical stress.
Particular attention is required where localized corrosion, erosion-corrosion, or stress-corrosion-related damage may occur. A technical assessment of the actual operating environment is recommended before selecting the material for critical equipment.
Heat Treatment
Monel K-500 is strengthened through precipitation hardening. Appropriate heat treatment is essential to achieve the required mechanical properties.
Depending on the product specification and initial condition, processing may involve solution treatment or another specified preparatory treatment followed by controlled ageing. The exact temperatures, holding times, and cooling requirements depend on the product form, dimensions, and governing specification.
An unsuitable heat-treatment cycle can result in nonconforming strength, hardness, or other properties. Heat treatment should therefore follow qualified procedures and manufacturer-approved technical data.
Welding and Fabrication
Welding Monel K-500 requires careful procedure selection because welding can affect its precipitation-hardened condition and local mechanical properties.
The welding process, filler metal, joint preparation, post-weld heat treatment, and inspection requirements should be established for the intended application. Pressure equipment and critical components should be manufactured using qualified welding procedures and the applicable construction code.
Machining and forming operations must also account for the alloy’s strength, hardness, and metallurgical condition.
Monel 400 vs Monel K-500
Monel 400 and Monel K-500 are both nickel-copper alloys, but Monel K-500 contains aluminium and titanium to enable precipitation hardening.
| Characteristic | Monel 400 | Monel K-500 |
|---|---|---|
| UNS Designation | N04400 | N05500 |
| Main Alloy System | Nickel-copper | Nickel-copper with aluminium and titanium |
| Precipitation Hardening | No | Yes |
| Mechanical Strength | Good | Generally higher after suitable ageing |
| Hardness | Depends on condition | Generally higher after hardening |
| Corrosion Resistance | Good in many compatible environments | Comparable in many compatible environments |
| Typical Applications | Piping, marine and chemical equipment | Shafts, fasteners, springs, pump components and mechanical tools |
Monel K-500 is generally selected when higher mechanical strength and hardness are important. The final choice should consider corrosion conditions, applied loads, temperature, fabrication requirements, and the applicable design standard.
Applications
Monel K-500 is used across a range of industrial sectors.
Marine Engineering
Used for selected propeller shafts, mechanical components, and equipment exposed to compatible marine environments.
Oil and Gas Industry
Applied in selected downhole tools and mechanical components where the material condition, corrosion resistance, and service requirements are suitable.
Pumps and Valves
Used for shafts, valve components, and other parts requiring high strength and resistance to compatible corrosive media.
Chemical Processing
Suitable for selected mechanical components and equipment used in compatible chemical environments.
Industrial Fasteners
Used for specified bolts, studs, and other load-bearing components requiring appropriate mechanical properties.
Springs and Instrumentation
Can be used in selected components where strength, hardness, and other specified mechanical properties are required.
Specialty Manufacturing
Suitable for precision-machined parts and engineered components designed around the alloy’s properties.
For critical oil and gas service, verify the required material condition, hardness, corrosion resistance, and compliance with the relevant industry requirements.
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