Overview
Inconel 625 is a corrosion and oxidation resistant nickel alloy that is used both for its high strength and outstanding aqueous corrosion resistance. Its outstanding strength and toughness is due to the addition of niobium which acts with the molybdenum to stiffen the alloy's matrix. Alloy 625 has excellent fatigue strength and stress-corrosion cracking resistance to chloride ions. This nickel alloy has excellent weldability and is frequently used to weld AL-6XN. This alloy resists a wide range of severely corrosive environments and is especially resistant to pitting and crevice corrosion. Some typical applications Inconel 625 is used in are chemical processing, aerospace and marine engineering, pollution-control equipment, and nuclear reactors.
Specification
ASTM B444-18 Standard Specification for Nickel-Chromium-Molybdenum-Columbium Alloys (UNS NO6625 and UNS NO6852) and Nickel-Chromium-Molybdenum-Silicon Alloy (UNS N06219) Pipe and Tube
| Size | 6.00 mm OD up to 914.4 mm OD |
| Thickness | 0.3mm – 50 mm, SCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXS |
| Length | Within 13500mm |
| Type | Seamless Pipes, Seamless Tubes |
| Grades | UNS N06625, N06852, and N06219 |
Equivalent Grades for Inconel Alloy 625 Tubes
| STANDARD | WERKSTOFF NR. | UNS | JIS | BS | GOST | AFNOR | EN |
| Inconel 625 | 2.4856 | N06625 | NCF 625 | NA 21 | ХН75МБТЮ | NC22DNB4M | NiCr22Mo9Nb |
Chemical Composition
| Grade | C | Mn | Si | S | Cu | Fe | Ni | Cr |
| Inconel 625 | 0.10max | 0.50 max | 0.50 max | 0.015max | – | 5.0 max | 58.0 min | 20.0 – 23.0 |
Mechanical Properties
| Element | Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| Inconel 625 | 8.4 g/cm3 | 1350 °C (2460 °F) | Psi – 1,35,000 MPa – 930 | Psi – 75,000 MPa – 517 | 42.5 % |
Applications
- 1. Aircraft ducting systems
- 2. Aerospace
- 3. Jet engine exhaust systems
- 4. Engine thrust-reverser systems
- 5. Specialized seawater equipment
- 6. Chemical process equipment
