Aperam Superimphy 625 Heat and Corrosion Resistant Nickel Alloy，1

### **Product Introduction: Aperam Superimphy® 625 - Heat and Corrosion Resistant Nickel Alloy** **Overview** Aperam Superimphy® 625 is a nickel-chromium-molybdenum-niobium superalloy renowned for its exceptional combination of high-temperature strength, outstanding corrosion resistance, and excellent fatigue and thermal fatigue properties. This solid-solution strengthened alloy demonstrates superior performance across a wide temperature range, from cryogenic conditions to elevated temperatures up to 980°C (1800°F). Its unique strengthening mechanism, derived from the synergistic effect of molybdenum and niobium in the nickel-chromium matrix, makes it an ideal choice for the most demanding applications in aerospace, chemical processing, and marine engineering. --- #### **Chemical Composition (Typical % by Weight)** | Element | Content (%) | Role & Benefit | |---------|-------------|---------------| | **Nickel (Ni)** | ≥ 58.0 | Forms austenitic matrix and provides fundamental corrosion resistance | | **Chromium (Cr)** | 20.0 - 23.0 | Confers outstanding oxidation and hot corrosion resistance | | **Molybdenum (Mo)** | 8.0 - 10.0 | Enhances strength and resistance to reducing acids and pitting corrosion | | **Niobium (Nb)** | 3.15 - 4.15 | Primary strengthening element through solid solution and carbide formation | | **Iron (Fe)** | ≤ 5.0 | Controlled residual element | | **Aluminum (Al)** | ≤ 0.40 | Contributes to oxidation resistance | | **Titanium (Ti)** | ≤ 0.40 | Enhances mechanical properties | | **Carbon (C)** | ≤ 0.10 | Controlled for carbide formation and stability | | **Manganese (Mn)** | ≤ 0.50 | Aids in manufacturability | | **Silicon (Si)** | ≤ 0.50 | Process control element | | **Phosphorus (P)** | ≤ 0.015 | Minimized for improved properties | | **Sulfur (S)** | ≤ 0.015 | Controlled to prevent hot cracking | *Note: Superimphy is a registered trademark of Aperam. This alloy corresponds to UNS N06625/W.Nr. 2.4856.* --- #### **Physical & Mechanical Properties** **Physical Properties:** - Density: 8.44 g/cm³ (0.305 lb/in³) - Melting Range: 1290-1350°C (2350-2460°F) - Thermal Expansion: 12.8 μm/m·°C @ 20-100°C - Thermal Conductivity: 9.8 W/m·K @ 100°C - Modulus of Elasticity: 207 GPa (30.0 x 10⁶ psi) - Magnetic Permeability: Essentially non-magnetic (<1.001) **Mechanical Properties (Solution Annealed - Room Temperature):** - Tensile Strength: 827 MPa (120 ksi) minimum - Yield Strength (0.2% Offset): 414 MPa (60 ksi) minimum - Elongation: 30% minimum - Hardness: HRB ≤ 100 **Elevated Temperature Properties:** - Maintains excellent strength up to 980°C (1800°F) - Outstanding creep and stress rupture properties - Good fatigue strength and thermal fatigue resistance --- #### **International Standards and Specifications** - **ASTM B446:** Nickel-Chromium-Molybdenum-Columbium Alloy (UNS N06625) Rod and Bar - **ASTM B443:** Nickel-Chromium-Molybdenum-Columbium Alloy (UNS N06625) Plate, Sheet, and Strip - **ASME SB-443/SB-446:** Pressure vessel applications - **AMS 5666:** Aerospace Material Specification for Bar and Forging - **AMS 5599:** Sheet, Strip, and Plate Specification - **EN 2.4856:** European material designation - **NACE MR0175/ISO 15156:** Sour service compliance - **DNV, ABS, LR:** Marine and offshore certifications --- #### **Product Applications** **Aerospace Industry:** - Jet engine components and exhaust systems - Gas turbine engine rings and casings - Afterburner components and liners - Rocket motor components - Aircraft ducting systems **Chemical Processing Industry:** - Reactors and pressure vessels - Heat exchangers and condensers - Pumps, valves, and fittings for corrosive service - Process piping systems - Agitators and mixing equipment **Marine and Offshore Applications:** - Seawater piping and heat exchangers - Propeller blades and submarine fittings - Offshore platform components - Marine exhaust systems - Desalination plant equipment **Power Generation:** - Gas turbine components - Heat recovery steam generators - Nuclear reactor core components - Flue gas desulfurization systems - High-temperature fasteners --- #### **Key Advantages** 1. **Exceptional Corrosion Resistance**: Outstanding performance in diverse corrosive environments including acids, alkalis, and seawater 2. **High-Temperature Strength**: Maintains excellent mechanical properties up to 980°C (1800°F) 3. **Excellent Fatigue Resistance**: Superior performance under cyclic loading conditions 4. **Outstanding Oxidation Resistance**: Excellent resistance to scaling and oxidation at high temperatures 5. **Good Fabricability**: Excellent welding and forming characteristics with minimal post-weld treatment required 6. **Versatile Performance**: Suitable for both corrosive and high-temperature applications 7. **Proven Reliability**: Extensive service history in critical applications worldwide 8. **Pitting Resistance Equivalent (PRE ~50)**: Excellent resistance to localized corrosion --- **Conclusion** Aperam Superimphy® 625 represents a premium-grade nickel-based superalloy that delivers an unparalleled combination of corrosion resistance, high-temperature strength, and mechanical reliability. Its sophisticated chemical composition, featuring optimized levels of chromium, molybdenum, and niobium, provides exceptional performance in the most challenging environments encountered in aerospace, chemical processing, marine, and power generation industries. The alloy's versatility, combined with excellent fabricability and proven long-term performance, makes it the material of choice for critical components where failure is not an option. Supported by comprehensive international standards and rigorous quality certifications, Superimphy 625 continues to set the benchmark for reliability and performance in extreme operating conditions.

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 3425 gallon liquid totes Special package is available on request.