What is the difference between INCOLOY 800 and incoloy 825?
If you need flanges that can withstand extreme heat, then Incoloy 800 is a better choice. However, if your project involves sour environments or requires resistance to stress corrosion cracking and pitting, then Incoloy 825 is a better choice.
What is INCOLOY 800 used for?
It is used in heat treatment equipment such as baskets, trays and fixtures. In chemical and petrochemical processing, the alloy is used for heat exchangers and other piping systems in nitric acid media, especially where resistance to chloride stress corrosion cracking is required.
What is the INCOLOY 825 material grade?
825 alloy (N08825) is a member of the nickel-chromium-iron-molybdenum (Ni-Cr-Fe-Mo) alloy family, developed in the 1950s. Its nominal content is 42% nickel, 32% iron, 22% chromium, 2.5% molybdenum and 2% copper, with 0.8% titanium added as a stabilizer, giving it excellent resistance to sulfuric and phosphoric acids.
Is Inconel 825 magnetic?
Inconel 825 is generally non-magnetic. The alloy consists of a mixture of nickel, iron, and chromium with added molybdenum, copper, and titanium, which enhance its overall corrosion resistance and maintain its non-magnetic properties.
Incoloy 800 vs 825 Alloy – What's the Difference?
The choice between Incoloy 800 and Incoloy 825 depends on performance goals and service environment. Incoloy 825 has increased corrosion resistance and strength due to the addition of nickel, molybdenum and copper. Incoloy 800 remains a solid choice for high temperature stability. The following table highlights the key differences:
| Property | Incoloy 800 | Incoloy 825 |
|---|---|---|
| Nickel Content | 30–35% | 38–46% |
| Molybdenum/Copper | None | 2.5–3.5%/1.5–3% |
| Tensile Strength | ≥ 450 MPa | ≥ 550 MPa |
| Corrosion Resistance | Good | Superior |
Comparison Table
| Aspect | Incoloy 800 | Incoloy 825 |
|---|---|---|
| Chemical Composition | Nickel, Iron, Chromium | Nickel, Iron, Chromium, Molybdenum, Copper, Titanium |
| Corrosion Resistance | Good general corrosion resistance; less effective in reducing environments, pitting, and crevice corrosion | Superior corrosion resistance due to added molybdenum and copper; excels in reducing environments, pitting, and crevice corrosion |
| Sulfur Content | Stricter control, resulting in better transient performance | Less strict sulfur control, slightly lower transient performance |
| Impurity Control | Less strict control of silicon and manganese | Better control of silicon and manganese, leading to higher durability |
| Mechanical Properties | Solid solution strengthened; similar strength to 825 | Solid solution strengthened; slightly higher strength due to molybdenum |
| Price | Lower cost, preferred for less harsh, high-temperature applications | Higher cost due to complex composition and better corrosion resistance |
| Typical Applications | High-temperature environments with less corrosive conditions (e.g., automotive, electrical resistance, thermal processing) | Highly corrosive environments (e.g., chemical processing, marine, oil & gas, pollution control) |
| Density (g/cm³) | 7.94 | 8.14 |
| Melting Range (°C) | 1357-1385 | 1370-1400 |
| Tensile Strength (MPa) | ≥450 | ≥550 |
| Yield Strength (MPa) | ≥170 | ≥220 |
| Elongation (%) | ≥30 | ≥30 |
| Hardness (HB) | ≤200 | ≤200 |
| Thermal Stability | Up to 870°C | Up to 870°C |
Chemical component (%):
|
Grade |
Chemical Composition % |
|||||||||||
|
C |
Mn |
P |
S |
Si |
Cr |
Ni |
Mo |
Ti |
Cu |
Al |
N |
|
|
Incoloy 800 |
0.10 |
1.50 |
0.045 |
0.015 |
1.00 |
19.0-23.0 |
30.0-35.0 |
_ |
_ |
0.75 |
0.15-0.60 |
_ |
|
825 |
0.025 |
1.00 |
0.020 |
0.010 |
0.50 |
19.5-23.5 |
38.0-46.0 |
2.5-3.5 |
0.6-1.2 |
1.50-3.00 |
0.20 |
_ |
Gnee Steel is a supplier of Incoloy 800 And Incoloy 825, with products covering 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, and its products meet or exceed many leading industry standards, including ASTM, ASME, SAE, AMS, ISO, DIN, EN and BS standards.
Gnee Steel stocks and sells Incoloy 800 And Incoloy 825 tubes, pipes, plates, strips, plates, round bars, flat bars, forged billets, hexagons, wire and extrusions. You are welcome to contact us for a quote at any time at ss@gneesteel.com
