MONEL Alloy K-500,DIN 17743, 17752, 17754; ，1

### **Product Introduction: MONEL® Alloy K-500 (UNS N05500)** **MONEL® Alloy K-500** is a precipitation-strengthened, age-hardenable version of the classic MONEL Alloy 400. It combines the excellent corrosion resistance of the nickel-copper system with the added advantage of significantly higher strength and hardness, achieved through the addition of aluminum and titanium. These elements form Ni₃(Ti,Al) precipitates during a controlled aging heat treatment, substantially increasing its mechanical properties. This alloy retains good ductility and low magnetic permeability, making it a premium material for high-performance applications in marine, oil and gas, and aerospace industries where both superior strength and outstanding corrosion resistance are required. --- ### **International Standards & Material Equivalents** MONEL Alloy K-500 is covered by a comprehensive set of international standards, with the DIN specifications provided being particularly relevant for European markets. | Standard Type | Standard Number | Designation / Purpose | | :--- | :--- | :--- | | **UNS (USA)** | **N05500** | **MONEL Alloy K-500** | | **ASTM (USA)** | B865 | Rod, Bar, and Forgings | | **ASTM (USA)** | F468 | Nonferrous Bolts, Hex Cap Screws, and Studs | | **ASME (USA)** | SB-865 | Rod, Bar, and Forgings (Pressure Vessel Code) | | **DIN (Germany)** | **17743** | NiCu30Al (Wrought Alloy Composition) | | **DIN (Germany)** | **17752** | NiCu30AlTi (Cast Alloy Composition) | | **DIN (Germany)** | **17754** | Designation System for Wrought NiCu30Al | | **Werkstoff Nr.** | **2.4375** | **2.4375** | | **ISO** | 6207 | NW 30 (Wrought) | > **Note:** MONEL® is a registered trademark of Special Metals Corporation. The key identifiers are **UNS N05500** and **Werkstoff 2.4375**. The DIN standards distinguish between the wrought (17743) and cast (17752) versions. --- ### **Chemical Composition** The composition is similar to MONEL 400 but includes aluminum and titanium for age-hardening. | Element | Content (%) | | :--- | :--- | | **Nickel (Ni)** | 63.0 min. | | **Copper (Cu)** | 27.0 - 33.0 | | **Aluminum (Al)** | 2.30 - 3.15 | | **Titanium (Ti)** | 0.35 - 0.85 | | **Iron (Fe)** | 2.0 max. | | **Manganese (Mn)** | 1.5 max. | | **Carbon (C)** | 0.25 max. | | **Silicon (Si)** | 0.5 max. | | **Sulfur (S)** | 0.01 max. | --- ### **Physical Properties** The physical properties are similar to MONEL 400, with the key difference being its non-magnetic nature even after aging. | Property | Value | | :--- | :--- | | **Density** | 8.44 g/cm³ (0.305 lb/in³) | | **Melting Point** | 1350 °C (2460 °F) | | **Thermal Conductivity** | 17 W/m·K (at 20°C) | | **Electrical Resistivity** | 0.65 μΩ·m (at 20°C) | | **Modulus of Elasticity** | 179 GPa (26 x 10⁶ psi) | | **Magnetic Response** | **Essentially non-magnetic** (even in aged condition) | --- ### **Mechanical Properties (Typical for Aged Condition)** The mechanical properties are significantly enhanced after the precipitation heat treatment. | Property | Value (Aged Condition) | | :--- | :--- | | **Tensile Strength** | 965 - 1200 MPa (140 - 174 ksi) | | **Yield Strength (0.2% Offset)** | 655 - 860 MPa (95 - 125 ksi) | | **Elongation** | 20% - 30% | | **Hardness (Rockwell C)** | 25 - 35 HRC | --- ### **Key Characteristics & Advantages** 1. **High Strength and Hardness:** Achieves strength levels nearly double those of MONEL 400 through precipitation hardening, while retaining good ductility. 2. **Excellent Corrosion Resistance:** Retains the excellent corrosion resistance of MONEL 400 in a wide range of environments, including seawater, hydrofluoric acid, alkalis, and many organic acids. 3. **Essentially Non-Magnetic:** A critical property for applications in marine instrumentation, geophysical exploration, and electronic systems where magnetic interference must be avoided. 4. **Good Fabricability:** Can be readily hot-worked and cold-worked in the solution-annealed condition. Machining should be performed in the annealed state before final aging. 5. **Trade-offs:** The high strength comes with reduced ductility compared to the annealed MONEL 400, and welding must be carefully managed to avoid age-hardening cracks in the heat-affected zone. --- ### **Product Applications** MONEL Alloy K-500 is specified for critical components that demand a combination of high strength and corrosion resistance. * **Marine Engineering:** * **Propeller and pump shafts** for high-performance vessels. * **Fasteners** (bolts, nuts, studs) for marine and offshore structures. * Doctor blades and scrapers in paper manufacturing. * Marine fixtures and components for subsea instruments. * **Oil & Gas:** * **Downhole logging tools and instrumentation housings.** * **Wellhead components**, valve stems, and pump impellers. * **Non-magnetic drill collars** (NMDC) for directional drilling. * **Aerospace & Defense:** * **Non-magnetic components** for guidance systems. * Springs, diaphragms, and chains for corrosive service. * **Chemical Processing:** * Stirrer shafts, scraper blades, and other moving parts in corrosive chemical environments. ### **Summary** **MONEL Alloy K-500 (UNS N05500 / Werkstoff 2.4375)** is a premium, precipitation-hardenable nickel-copper alloy that delivers the proven corrosion resistance of MONEL 400 with significantly enhanced strength and hardness. Governed by standards like **DIN 17743** and **DIN 17752**, its unique combination of high mechanical properties, excellent corrosion resistance, and essential non-magnetism makes it an indispensable engineering material for the most demanding applications in marine, oilfield, and aerospace technologies. It is the material of choice when standard corrosion-resistant alloys lack the necessary strength for the application.

Packing of Standard Packing: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 3295 gallon liquid totes Special package is available on request.