Havar High Permeability Nickel Magnetic Alloy,Nickel Iron Molybdenum Alloy,Ni15Fe5Mo Alloy,E FORU

### **Havar® (UNS R30005) - High-Strength Cobalt-Based Alloy** #### **Overview & Clarification** It is important to clarify a common misconception: **Havar® is not a high-permeability nickel magnetic alloy.** It is a **cobalt-chromium-based hardenable alloy**, renowned for its unique combination of **high strength, hardness, and excellent corrosion resistance.** While the description mentions "Ni15Fe5Mo," this does not accurately represent Havar's primary composition. The term "High Permeability Nickel Magnetic Alloy" more accurately describes a different class of materials, such as Permalloy (e.g., Alloy 79 with 80% Ni). Havar belongs to a family of superalloys that derive their properties from a cobalt-chromium matrix and are strengthened by a precipitation-hardening (aging) heat treatment. Its key characteristics make it unsuitable for soft magnetic applications but ideal for demanding roles as springs, diaphragms, and wear-resistant components in corrosive environments. --- #### **Chemical Composition (Weight % - Typical)** Havar's composition is complex and balanced for optimal performance. | Element | Content (%) | | :--- | :--- | | **Cobalt (Co)** | **Balance** | | **Chromium (Cr)** | **19.0 - 21.0** | | **Nickel (Ni)** | **12.0 - 14.5** | | **Molybdenum (Mo)** | **11.0 - 12.0** | | **Tungsten (W)** | **2.5 - 3.5** | | **Manganese (Mn)** | **1.50 - 2.00** | | **Carbon (C)** | **0.15 - 0.25** | | **Iron (Fe)** | **≤ 1.50** | | **Silicon (Si)** | **≤ 0.30** | * **Cobalt (Co):** Provides the base for a stable, strong matrix that retains its properties at high temperatures. * **Chromium (Cr):** Imparts outstanding resistance to corrosion and oxidation. * **Molybdenum & Tungsten:** Potent solid solution strengtheners that significantly enhance strength and hardness. * **Carbon:** Forms hard carbides with chromium, molybdenum, and tungsten, contributing to wear resistance. * **Nickel & Manganese:** Stabilize the austenitic (face-centered cubic) structure and enhance workability. --- #### **Physical & Mechanical Properties** The following table outlines the key properties of Havar in the solution annealed and precipitation-hardened condition. | Property | Value / Description | | :--- | :--- | | **Density** | 8.30 g/cm³ | | **Melting Range** | ~1370 - 1425 °C (2500 - 2600 °F) | | **Thermal Conductivity** | ~14.5 W/m·K (at 20°C) | | **Electrical Resistivity** | ~0.85 μΩ·m | | **Modulus of Elasticity (Elastic Modulus)** | ~230 GPa (33.5 x 10⁶ psi) | | **Tensile Strength (Precipitation Hardened)** | ~1550 - 1725 MPa (225 - 250 ksi) | | **Yield Strength (0.2% Offset, Precipitation Hardened)** | ~1200 - 1450 MPa (175 - 210 ksi) | | **Elongation (Precipitation Hardened)** | ~3 - 8% | | **Hardness (Precipitation Hardened)** | **50 - 55 HRC** | | **Magnetic Properties** | **Essentially non-magnetic** in the annealed and hardened conditions. | --- #### **Key Characteristics & Applications** **Key Characteristics:** 1. **High Strength-to-Weight Ratio:** Offers exceptional strength, comparable to many high-strength steels, but with superior corrosion resistance. 2. **Excellent Corrosion Resistance:** Resists pitting, crevice corrosion, and stress-corrosion cracking in a wide range of environments, including seawater, acids, and chlorides. 3. **High Hardness and Wear Resistance:** The precipitation-hardened structure provides excellent resistance to galling, fretting, and abrasive wear. 4. **Good Fatigue Strength:** Suitable for dynamic load-bearing applications like springs. 5. **Non-Magnetic:** Retains its non-magnetic character even after severe cold working or heat treatment. **Typical Applications:** Havar is used in highly specialized, demanding applications across various industries. * **Precision Springs & Diaphragms:** For critical applications in regulators, valves, and instruments within the aerospace, chemical, and oil & gas industries. * **Medical Devices:** Used for surgical tools, orthopedic blades, and components for medical pumps due to its biocompatibility, strength, and corrosion resistance. * **Industrial Cutting & Wear Parts:** Blades, cutter heads, and wear plates in corrosive or high-wear environments. * **Fasteners:** High-performance bolts and screws for critical assemblies where corrosion and strength are concerns. * **Custom Machinery Components:** Shafts, bearings, and seals that must operate reliably in aggressive media. --- #### **International Standards** Havar is a proprietary alloy, originally developed by Hamilton Precision Metals. Its specifications are often defined by its unique composition rather than a generic standard. | Standard / System | Designation | Description | | :--- | :--- | :--- | | **UNS (Unified Numbering System)** | **R30005** | This is the standard designation for this specific cobalt-chromium-nickel-molybdenum alloy. | | **Proprietary / Trade Name** | **Havar®** | The common trade name under which the alloy is supplied. | | **ASTM** | **F** (TBD) | While not a perfect fit, it may be referenced under custom material specifications for medical or aerospace components. There is no direct, common ASTM "B" or "A" standard like there is for commercial steels or nickel alloys. | | **ISO** | **ISO 5832-5** | This standard is for "Wrought cobalt-chromium-nickel-molybdenum-iron alloy" for surgical implants. The composition is very similar, though not always identical, to Havar, indicating its use in the medical field. | --- #### **Summary** In summary, **Havar® (UNS R30005)** is a premium, **cobalt-based superalloy** prized for its exceptional strength, hardness, and corrosion resistance. It is fundamentally different from and should not be confused with high-permeability nickel-iron soft magnetic alloys. Its primary use is in the manufacture of critical, high-performance components like springs, diaphragms, cutting edges, and surgical tools that must withstand corrosive environments, high stresses, and demanding wear conditions. As a proprietary material, it is best specified by its trade name **Havar®** or its UNS number **R30005**.

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 3208 gallon liquid totes Special package is available on request.