B Cast UNS N24030 Nickel-Copper Alloy, Cast Grade M-30H; 1

### **Product Introduction: B Cast UNS N24030 (M-30H) High-Strength Nickel-Copper Alloy** **Overview** Cast UNS N24030, commercially known as **MONEL® alloy K-500** in its wrought form and identified by the cast grade **M-30H**, is a precipitation-hardenable nickel-copper alloy. It possesses the same excellent corrosion resistance as its counterpart, MONEL alloy 400 (M-35-2), but with significantly higher strength and hardness. This enhanced strength is achieved through the addition of aluminum and titanium, which allow the alloy to be age-hardened. M-30H offers a unique combination of high strength, excellent corrosion resistance, and non-magnetic properties, making it ideal for demanding applications in marine, oil and gas, and aerospace industries. --- #### **Chemical Composition (Typical % by Weight, per ASTM A494)** The composition of M-30H is engineered for precipitation hardening while maintaining excellent corrosion resistance. | Element | Content (%) | Role & Benefit | | :--- | :--- | :--- | | **Nickel (Ni)** | 63.0 min (inc. Co) | Forms the primary austenitic matrix, providing fundamental corrosion resistance and metallurgical stability. | | **Copper (Cu)** | 27.0 - 33.0 | Provides excellent resistance to seawater, sulfuric acid, and other reducing environments. | | **Aluminum (Al)** | 2.30 - 3.15 | A key hardening element. It combines with nickel during aging to form the coherent gamma prime (γ') phase, Ni₃(Al, Ti), which is responsible for the significant increase in strength and hardness. | | **Titanium (Ti)** | 0.35 - 0.85 | Works synergistically with aluminum to form the strengthening γ' phase. | | **Iron (Fe)** | 2.0 max | A controlled residual element. | | **Manganese (Mn)**| 1.5 max | Aids in castability and controls sulfur. | | **Carbon (C)** | 0.25 max | A residual element. | | **Silicon (Si)** | 0.50 max | A deoxidizer used in the casting process; kept low to maintain ductility. | | **Sulfur (S)** | 0.01 max | A detrimental element kept to an absolute minimum to prevent hot cracking. | *Note: "MONEL" is a registered trademark of Special Metals Corporation.* --- #### **Physical & Mechanical Properties (Typical - Aged Condition)** | Property | Value / Condition | | :--- | :--- | | **Density** | 8.44 g/cm³ (0.305 lb/in³) | | **Melting Range** | 1315 - 1350 °C (2400 - 2460 °F) | | **Thermal Expansion** | 13.9 μm/m·°C (7.7 μin/in·°F) @ 20-100°C | | **Tensile Strength** | 895 MPa (130 ksi) min | | **Yield Strength (0.2% Offset)** | 690 MPa (100 ksi) min | | **Elongation** | 10% min | | **Hardness** | Brinell 290 - 360 HBW | *Note: Mechanical properties are achieved through a specific heat treatment cycle (Solution Annealing followed by Aging).* --- #### **International Standards and Specifications** Cast UNS N24030 (M-30H) is specified by major international and military standards for high-strength components. * **Cast Product Standards:** * **ASTM A494 / A494M:** Standard Specification for Castings, Nickel and Nickel Alloy. (Grade M-30H) * **UNS N24030:** Unified Numbering System designation for the cast alloy. * **Military QQ-N-288 Grade B:** U.S. military specification for castings. * **Wrought Equivalent:** * **UNS N05500 (MONEL K-500):** The standard wrought form. * **ASTM B865:** Standard Specification for Precipitation Hardening Nickel-Copper-Aluminum Alloy Bars, Forgings, and Forging Stock. --- #### **Product Applications** M-30H cast components are selected for applications requiring both high strength and superior corrosion resistance. 1. **Marine & Offshore:** * High-strength pump shafts and impellers for seawater service. * Propeller shafts, marine drill collars, and fasteners. * Components for subsea oil and gas systems. 2. **Oil & Gas Production:** * Wellhead components, valve trim, and hangers for sour service (H₂S) environments. * Scraper blades and other downhole tool components requiring abrasion resistance. 3. **Aerospace & Defense:** * Non-magnetic, high-strength components for instrumentation and guidance systems. * Engine components requiring corrosion resistance and strength. 4. **Chemical Processing:** * Agitator shafts, mixer blades, and other components in corrosive environments where high mechanical strength is critical. #### **Key Advantages** * **High Strength-to-Corrosion Ratio:** Offers a unique combination of high yield strength (exceeding 690 MPa) and excellent corrosion resistance, a profile unmatched by many other alloys. * **Excellent Mechanical Properties:** High tensile and fatigue strength, good creep rupture properties, and maintained ductility in the aged condition. * **Excellent Corrosion Resistance:** Inherits the outstanding resistance of the Ni-Cu system to seawater, sulfuric acid, and caustic solutions. * **Non-Magnetic:** Remains non-magnetic over a wide range of temperatures and strength levels. **Conclusion** Cast UNS N24030 (M-30H) is a premium, precipitation-hardenable nickel-copper alloy that delivers exceptional strength without compromising the renowned corrosion resistance of the MONEL family. For critical components in marine, oil and gas, and aerospace applications where high mechanical loads are present in aggressive environments, M-30H offers a superior and reliable solution. Its compliance with ASTM A494 and military specification QQ-N-288 ensures consistent quality and performance for high-integrity cast components.

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 3405 gallon liquid totes Special package is available on request.