What is the difference between Inconel 625 and incoloy 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.
Does Inconel 625 rust?
Inconel 625 (UNS N06625) is a nickel-chromium-molybdenum alloy that has excellent corrosion resistance in a variety of corrosive media, especially pitting and crevice corrosion. However, in corrosive environments, Inconel 625 will corrode like other metals.
What is Incoloy 825 material?
INCOLOY 825 alloy (UNS N08825/W.Nr. 2.4858) is a nickel-iron-chromium alloy with additions of molybdenum, copper, and titanium. The chemical composition of the alloy (shown in Table 1) is designed to provide excellent resistance to a wide range of corrosive environments.
Can Inconel 625 be hardened?
This process helps increase the strength and hardness of the material. Precipitation hardening of Inconel 625 is typically performed at temperatures between 540°C and 620°C for approximately 8 hours.
Difference Between Inconel 625 and 825
| 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. |
Inconel 625 vs Incoloy 825 Chemical Composition
| Element | Incoloy 825 | Inconel 625 |
|---|---|---|
| C | ≤ 0.05 | ≤ 0.08 |
| Mn | ≤ 1.0 | ≤ 0.35 |
| Fe | ≥ 22 | ≤ 5 (Note: Original table lists "rest", standard value is ≤5%) |
| S | ≤ 0.03 | ≤ 0.015 |
| Si | ≤ 0.5 | ≤ 0.35 |
| Cu | 1.5–3.0 | ≤ 0.3 |
| Ni | 38–46 | ≥58 (Note: Original table range error, standard is ≥58%) |
| Co | - | ≤ 1.0 |
| Al | ≤ 0.2 | ≤ 0.4 |
| Ti | 0.6–1.2 | ≤ 0.4 |
| Cr | 19.5–23.5 | 20–23 |
| Nb+Ta | - | 3.15–4.15 |
| Mo | 2.5–3.5 | 8.0–10.0 |
| Others | - | - |
Difference between Inconel 625 and Incoloy 825
| Inconel 625 | Incoloy 825 | |
| Defination | It is nickel based superalloy which contains a high amount of nickel than any other grade of Inconel | It is nickel based superalloy which contains a moderate amount of nickel as compared to any other grade of Inconel |
| Nickel Content | It contains about 58% of nickel | It contains about 36-48% of nickel |
| Tensile Strength | It has very high tensile strength and yield strength | It has comparatively low tensile strength and yield strength |
| Elongation | It's elongation is about 42.52% | It's elongation is about 30% |
Gnee Steel is a supplier of Inconel 625 and Incoloy 825 in tubes, pipes, plates, strips, plates, round bars, flat bars, forged billets, hexagons, wire and extrusions. We work with steel mills to provide customers with 625 alloy that meets or exceeds many leading industry standards, including ASTM, ASME, SAE, AMS, ISO, DIN, EN and BS standards.
Gnee Steel stocks and sells Inconel 625 and Incoloy 825 tubes, pipes, plates, strips, plates, round bars, flat bars, forged billets, hexagons, wire and extrusions. Feel free to contact us for a quote at ss@gneesteel.com
