Inconel 625 VS 825
What is the ASTM standard for Alloy 625 pipe?
Inconel 625 is a nickel-chromium-molybdenum-niobium alloy material with a primary nickel content of at least 58%. It is also known as Inconel 625 or UNS NO6625 according to ASTM B444 (pipe) or ASTM B443 (sheet and coil).
What is the difference between Inconel 625 and 825?
Inconel 625 is often used in sour gas service due to its good resistance to stress corrosion cracking and pitting, while Inconel 825 is often used in crude oil service due to its good corrosion resistance in sour environments.
Is Inconel 625 alloy magnetic?
Inconel 625 alloy is a non-magnetic, corrosion-resistant and oxidation-resistant nickel-chromium alloy. The high strength of Inconel 625 alloy comes from its strengthening combination of molybdenum and niobium added to the nickel-chromium matrix.
What size is Inconel 625 pipe?
The Alloy 625 Seamless Tubing comes in sizes ranging from 4mm to 219mm. There are welded, fabricated and LSAW pipes as well. The welded and EFW pipes range from 5mm to 1219.2mm in size. The wall thickness of the Inconel 625 Seamless Pipe ranges from 0.5mm 20mm.
Inconel 625 and 825 Specifications
| Alloy 825 | Alloy 625 | |
|---|---|---|
| Material | nickel-iron-chromium alloy 825 | nickel-chromium alloy 625 |
| Equivalent | W.Nr. 2.4858 UNS N08825 |
W.Nr. 2.4856 UNS N06625 |
| Density | 0.294 lb/cu in | 0.305 lb/cu in |
| Melting Range | 1370-1400°C | 1290-1350°C |
| Curie Temperature | <-196°C | -196°C |
| Thermal Conductivity | 76.8 Btu • in/ft2•h•°F 11.1 W/m •°C. |
68 Btu • in/ft2•h•°F 9.8 W/m •°C. |
Alloy 825 vs Alloy 625 Applications and Uses
| Inconel Alloy 625 |
Engine Exhaust Systems Sea-water Applications Aircraft Ducting Systems Thrust-reverser Systems Distillation Columns Heat-exchanger And Boilers Seals Springs Bellows |
| Incoloy Alloy 825 |
Chemical Processing Acid Production Nuclear Fuel Reprocessing Oil And Gas Recovery Pickling Operations |
Charpy Impact Strength of Inconel 625 vs 825 Plates According to Special Metals (USA)
Inconel Alloy 625
| Temperature | Orientation | Inconel Impact Strength | |
|---|---|---|---|
| J | ft-lb | ||
| 29°C | Longitudinal | 65, 66, 68 | 48, 49, 50 |
| Transverse | 62, 66, 70 | 46, 49, 51.5 | |
| -79°C | Longitudinal | 53, 57, 60 | 39, 44, 49 |
| Transverse | 53, 57, 60 | 39, 42, 44 | |
| -196°C | Longitudinal | 47, 47, 48 | 35, 35, 35.5 |
| Transverse | 42, 43, 49 | 31, 32, 36 | |
Incoloy Alloy 825
| Temperature | Orientation | Incoloy Impact Strength | |
|---|---|---|---|
| J | ft-lb | ||
| Room | Longitudinal | 107 | 79.0 |
| Transverse | 113 | 83.0 | |
| -43 °C | Longitudinal | 106 | 78.0 |
| Transverse | 106 | 78.5 | |
| -196 °C | Longitudinal | 91 | 67.0 |
| Transverse | 97 | 71.5 | |
| -253 °C | Longitudinal | 92 | 68.0 |
| Transverse | 92 | 68.0 | |
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