Udimet 630 Nickel Alloy，1

### **Product Datasheet: Udimet® 630 (Alloy 630 / 17-4PH Stainless Steel Equivalent)** **A Precipitation-Hardenable, Corrosion-Resistant Nickel Superalloy** --- #### **1. Overview** **Udimet® 630** is a premium precipitation-hardening (PH) nickel-cobalt superalloy known for its unique combination of high strength, excellent corrosion resistance, and good fabricability. It is often described as a high-performance alternative to martensitic PH stainless steels like 17-4PH, but with superior strength at elevated temperatures and better toughness. Its composition allows it to be supplied in the solution-annealed condition, where it is relatively soft and readily machinable, and then hardened to high strength levels through a simple, low-temperature aging treatment with minimal distortion. This alloy is ideal for applications requiring high strength-to-weight ratio, corrosion resistance, and stability in service environments up to approximately 650°C (1200°F). #### **2. Chemical Composition (Typical Weight %)** The specific composition is tailored to achieve its unique precipitation-hardening mechanism. | Element | Content (%) | Role in the Alloy | | :--- | :--- | :--- | | **Nickel (Ni)** | Balance | Provides the austenitic matrix and base corrosion resistance. | | **Cobalt (Co)** | ~20.0 | Provides solid solution strengthening and enhances high-temperature stability. | | **Chromium (Cr)** | ~18.0 | Imparts resistance to oxidation and corrosion. | | **Molybdenum (Mo)** | ~4.5 | Enhances strength and resistance to pitting and crevice corrosion. | | **Titanium (Ti)** | ~3.0 | Primary strengthening element; forms the γ' (gamma prime) Ni₃Ti phase during aging. | | **Aluminum (Al)** | ~1.6 | Contributes to γ' (gamma prime) formation for strengthening. | | **Niobium (Nb)** | ~0.8 | Contributes to strengthening via carbide formation and secondary precipitation. | | **Carbon (C)** | ≤ 0.05 | Forms carbides for grain boundary control. | | **Boron (B)** | ≤ 0.010 | Strengthens grain boundaries. | | **Zirconium (Zr)** | ≤ 0.05 | Enhances creep strength. | | **Iron (Fe)** | ≤ 1.0 | Residual element. | | **Manganese (Mn)** | ≤ 0.10 | Residual element. | | **Silicon (Si)** | ≤ 0.15 | Residual element. | #### **3. Physical Properties (Typical)** | Property | Value / Condition | | :--- | :--- | | **Density** | 8.21 g/cm³ (0.297 lb/in³) | | **Melting Range** | ~1330 - 1400 °C (~2425 - 2550 °F) | | **Thermal Expansion Coefficient** | 12.8 μm/m·°C (20 - 100°C) | | **Thermal Conductivity** | 12.5 W/m·K (at 100°C) | | **Electrical Resistivity** | ~1.15 μΩ·m | | **Modulus of Elasticity** | ~212 GPa (30.7 x 10⁶ psi) | #### **4. Mechanical Properties** Properties are developed through a solution treatment followed by a single-step aging process. The following are typical for bar stock. **After Solution Treatment (Annealed Condition):** * This condition is soft for machining. * **Typical Hardness:** ≤ 341 HB **After Full Heat Treatment (Solution Treated + Aged):** * **Tensile Strength:** ≥ 1450 MPa (210 ksi) * **Yield Strength (0.2% Offset):** ≥ 1240 MPa (180 ksi) * **Elongation:** ≥ 10% * **Reduction of Area:** ≥ 12% * **Hardness:** ≥ 42 HRC **At Elevated Temperature (e.g., 650°C / 1200°F):** * Retains a significant portion of its room-temperature strength, offering excellent short-term service capability at these temperatures. #### **5. Heat Treatment** A standard heat treatment cycle for Udimet 630 is as follows: 1. **Solution Treatment:** Heat to 1065°C - 1095°C (1950°F - 2000°F), hold, then rapidly cool (oil quench or forced air). This results in a soft, machinable condition. 2. **Aging / Precipitation Hardening:** Heat to 760°C - 785°C (1400°F - 1450°F), hold for 4-8 hours, then air cool. This step precipitates the strengthening γ' phase throughout the matrix, achieving maximum strength. #### **6. Product Applications** Udimet 630 is used in high-integrity components across aerospace, marine, and energy industries, including: * **Aerospace:** Turbine engine components, shafts, disks, fasteners, landing gear parts, and high-strength bolts. * **Oil & Gas:** Valve components, pump shafts, and downhole tooling requiring corrosion resistance and high strength. * **Marine:** Shafts, fittings, and components for naval and offshore applications. * **General Engineering:** High-strength fittings, molds, and dies where corrosion resistance is also required. #### **7. International and Industry Standards** Udimet 630 is covered by several key international and proprietary specifications. * **AMS:** **AMS 5709E** (Bars, forgings, and rings, 18Cr - 16.5Co - 4.2Mo - 3.1Ti - 1.5Al, solution and precipitation heat treated) * **UNS:** **N07630** * **Common Forms:** Bar, wire, billet, ring, and forged shapes. --- **Disclaimer:** The information provided is typical and for reference purposes only. Mechanical properties are highly dependent on section size, heat treatment parameters, and manufacturing process. For design and procurement, the applicable material specification (e.g., AMS 5709) and the manufacturer's technical data must be consulted. Udimet is a registered trademark of Special Metals Corporation (a PCC company).

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 3360 gallon liquid totes Special package is available on request.