Alloy 625，Inconel 625 ，UNS N06625，EFORU

British Specs:BS 3072 BS 3073 BS 3074 BS 3075 BS 3076 NA21，American Specs:AMS 5581 Tube AMS 5599 Sheet, Strip and Plate AMS 5666 Bar, Forgings AMS 5869 Sheet, Strip and Plate AMS 5879 Sheet, Strip and Foil AMS 5837 Welding Wire ASTM F3056 Powder AMS 7001 Powder，German Specs:WS 2.4856, AFNOR NC22DNb

### **Alloy 625 / Inconel 625 / UNS N06625 – Nickel-Chromium-Molybdenum-Niobium Alloy** **Product Overview** Inconel 625 (UNS N06625) is a nickel-chromium-molybdenum alloy with significant additions of niobium, designed to provide exceptional strength, outstanding corrosion resistance, and excellent fabricability. This solid-solution strengthened alloy maintains excellent mechanical properties from cryogenic temperatures up to 1200°C (2192°F) and demonstrates superior performance in a wide range of aggressive corrosive environments. Its unique combination of niobium and molybdenum provides resistance to various corrosive media, making it particularly suitable for aerospace, marine, chemical processing, and nuclear applications. --- **Chemical Composition (ASTM B443 / B444)** | Element | Content (%) | |----------------|----------------| | **Nickel (Ni)** | 58.0 min | | **Chromium (Cr)**| 20.0–23.0 | | **Molybdenum (Mo)**| 8.0–10.0 | | **Niobium (Nb)** | 3.15–4.15 | | **Iron (Fe)** | 5.0 max | | **Carbon (C)** | 0.10 max | | **Manganese (Mn)**| 0.50 max | | **Silicon (Si)** | 0.50 max | | **Phosphorus (P)**| 0.015 max | | **Sulfur (S)** | 0.015 max | | **Aluminum (Al)**| 0.40 max | | **Titanium (Ti)**| 0.40 max | *The combination of molybdenum and niobium provides exceptional strength and corrosion resistance through solid solution strengthening and precipitation hardening mechanisms.* --- **Physical Properties** | Property | Value | |-------------------------------|---------------------------------| | **Density** | 8.44 g/cm³ (0.305 lb/in³) | | **Melting Range** | 1290–1350°C (2350–2460°F) | | **Electrical Resistivity** | 129 μΩ·cm (at 21°C) | | **Thermal Conductivity** | 9.8 W/m·K (at 100°C) | | **Mean Coefficient of Thermal Expansion** | 12.8 μm/m·°C (20–100°C) | | **Modulus of Elasticity** | 207 GPa (30,000 ksi) | | **Magnetic Permeability** | <1.005 (Essentially non-magnetic)| --- **Mechanical Properties (Annealed Condition)** | Property | Room Temperature | 650°C (1200°F) | 815°C (1500°F) | |-----------------------------|------------------|----------------|----------------| | **Tensile Strength** | 830 MPa (120 ksi)| 620 MPa (90 ksi)| 450 MPa (65 ksi)| | **Yield Strength (0.2% Offset)** | 410 MPa (60 ksi)| 330 MPa (48 ksi)| 260 MPa (38 ksi)| | **Elongation in 2"** | 45% | 40% | 45% | | **Reduction of Area** | 65% | 60% | 65% | | **Hardness** | 95 HRB | 85 HRB | 75 HRB | **Cryogenic Properties (-196°C / -320°F)** - **Tensile Strength**: 1450 MPa (210 ksi) - **Yield Strength**: 860 MPa (125 ksi) - **Elongation**: 40% --- **Key Characteristics & Advantages** 1. **Exceptional Corrosion Resistance** – Outstanding performance in wide range of corrosive media 2. **High Strength Across Temperature Range** – Maintains properties from cryogenic to high temperatures 3. **Excellent Fatigue Resistance** – Superior performance under cyclic loading conditions 4. **Good Oxidation Resistance** – Performs well in high-temperature oxidizing atmospheres 5. **Outstanding Fabricability** – Can be welded, formed, and machined using standard techniques 6. **Resistance to Chloride Stress Corrosion Cracking** – Superior to many stainless steels 7. **Good Erosion and Cavitation Resistance** – Suitable for high-velocity fluid applications --- **Product Applications** **Aerospace & Defense** - Engine exhaust systems - Ducting systems - Turbine shrouds - Spray bars - Afterburner components **Marine Engineering** - Propeller blades - Submarine fittings - Seawater piping systems - Heat exchangers - Fasteners and bolting **Chemical Processing** - Reactor vessels - Heat exchanger tubing - Process piping - Agitators and mixers - Distillation columns **Oil & Gas Industry** - Downhole instrumentation - Wellhead components - Seawater injection systems - Process vessels - Flue gas desulfurization systems **Nuclear Industry** - Core components - Control rod mechanisms - Fuel element assemblies - Waste processing equipment - Heat exchanger tubing --- **International Standards** | Standard Type | Standard Number | Specification | |---------------|-----------------|---------------| | **UNS** | **N06625** | Unified Numbering System | | **ASTM** | B443 | Plate, Sheet, and Strip | | **ASTM** | B444 | Pipe and Tube | | **ASTM** | B446 | Rod and Bar | | **ASME** | SB443 | Boiler and Pressure Vessel Code | | **ASME** | SB444 | Boiler and Pressure Vessel Code | | **AMS** | 5599 | Aerospace Material Specification | | **DIN** | 2.4856 | German Standard | | **EN** | NiCr22Mo9Nb | European Standard | --- **Corrosion Resistance Performance** **Excellent Resistance To** - Pitting and crevice corrosion - Chloride stress corrosion cracking - Intergranular attack - Oxidizing acids and salts - Seawater and marine atmospheres **Good Resistance To** - Sulfuric acid - Phosphoric acid - Hydrochloric acid (moderate concentrations) - Organic acids - Alkaline solutions **High-Temperature Performance** - **Oxidation Resistance**: Up to 1100°C (2012°F) - **Cyclic Oxidation**: Good up to 980°C (1800°F) - **Carburization Resistance**: Moderate - **Nitriding Resistance**: Good --- **Fabrication & Processing** **Welding Characteristics** - **Weldability**: Excellent - **Methods**: GTAW, GMAW, SMAW, SAW - **Filler Metals**: ERNiCrMo-3, ENiCrMo-3 - **Preheating**: Not required - **Post-Weld Heat Treatment**: Generally not necessary **Machining Guidelines** - **Tools**: Carbide tools recommended - **Speeds**: 15–25 m/min (50–80 SFM) - **Feeds**: Medium feeds with positive rake - **Coolants**: Required for optimum results **Forming Operations** - **Hot Working**: 1150–1200°C (2100–2200°F) - **Cold Working**: Good capability with intermediate annealing - **Annealing**: 1150–1200°C (2100–2200°F) --- **Heat Treatment** **Solution Annealing** - **Temperature**: 1150–1200°C (2100–2200°F) - **Time**: 30 minutes to 2 hours - **Cooling**: Rapid air cool or water quench **Stress Relieving** - **Temperature**: 870–980°C (1600–1800°F) - **Time**: 1–4 hours depending on section size --- **Quality Assurance & Testing** **Standard Testing** - Chemical analysis verification - Tensile testing at room temperature - Hardness testing - Impact testing - Corrosion testing per ASTM G48 **Non-Destructive Testing** - Liquid penetrant examination - Ultrasonic testing - Radiographic examination - Eddy current testing **Certification** - Mill Test Certificates per EN 10204 3.1 - Chemical analysis certificates - Mechanical test reports - Heat treatment records - NDE reports as specified --- **Available Product Forms** - Plate and Sheet - Rod and Bar - Wire and Strip - Pipe and Tube - Forgings and Fittings - Welding Products --- **Conclusion** Inconel 625 (UNS N06625) is a versatile nickel-chromium-molybdenum-niobium alloy that offers an exceptional combination of high strength, outstanding corrosion resistance, and excellent fabricability. Its superior performance across a wide temperature range, coupled with resistance to various corrosive environments, makes it ideal for applications in aerospace, marine engineering, chemical processing, and nuclear industries. The alloy's unique composition provides reliable performance in some of the most demanding service conditions, offering engineers and designers a proven material solution where reliability, safety, and long-term performance are critical requirements.

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 1754 gallon liquid totes Special package is available on request.