Incoloy 825 alloy introduction:
Incoloy 825 is a titanium stabilized all-austenitic Ni-Fe-Cr alloy with added copper and molybdenum. Incoloy 825 is a general purpose engineered alloy that is resistant to acid and alkali metal corrosion in both oxidation and reduction environments.
Grade: Incoloy 825 (Alloy 825)
Application: Air heat exchangers in petroleum refining
Alloy properties: Good stress corrosion cracking resistance
Chemical composition: Nickel Ni: 38-46
Incoloy 825 Close to the Grade:
NS142(China), NC21FeDu (France), w.n.r.2.4858 NiCr21Mo (Germany) NA16 (UK) Incoloy 825, UNS NO8825 (USA) NiFe30Cr21Mo3 (ISO)
Incoloy 825 Alloy Properties
Incoloy 825(Can provide sheet, bar, pipe and cutting) is a titanium stabilized all-austenitic Ni-Fe-Cr alloy with added copper and molybdenum.
1. Good stress corrosion cracking resistance
2. Good resistance to pitting and crevice corrosion
3. Good oxidation resistance and non-oxidation thermal acidity
4. Excellent mechanical properties at room temperature and up to 550°C
5. Certified to manufacture pressure vessels with temperatures up to 450°C
Metallographic structure of Incoloy 825:
825 is a face-centered cubic lattice structure.
Similar Material Grade: Incoloy800H /HT
Corrosion resistance of Incoloy 825:
825 alloy is a general purpose engineering alloy that is resistant to acid and alkali corrosion in both oxidation and reduction environments. The high nickel content gives the alloy effective stress corrosion cracking resistance.
Corrosion resistance is good in a variety of media, such as sulfuric, phosphoric, nitric and organic acids, alkali metals such as sodium hydroxide, potassium hydroxide and hydrochloric acid solutions.
The high comprehensive performance of 825 alloy is shown in the nuclear combustion dissolver with a variety of corrosive media, such as sulfuric acid, nitric acid and sodium hydroxide are all processed in the same equipment.
Applications
825 alloy is widely used in various industrial fields where the operating temperature does not exceed 550°C.
Typical (Incoloy 825) applications are:
1. Heating tubes, containers, baskets and chains for sulfuric acid pickling plants.
Seawater cooling heat exchanger, Marine product pipeline system, acidic gas environment pipeline.
3. Heat exchanger, evaporator, washing, impregnation pipe, etc., in phosphoric acid production.
4. Air heat exchanger in petroleum refining
Food engineering
6. Chemical process
7. Flame retardant alloy for high-pressure oxygen applications
Mechanical Properties:
Density | 8.1 g/cm3 |
| Point de fusion | 1370-1400°C |
Incoloy 825 The minimum value of mechanical properties of an alloy at room temperature:
| Alloy &State | Tensile Strength Rm N/mm2 | Yield strength RP0.2N/mm2 | Extend rate A5 % | Brinell hardness HB |
| 825 | 550 | 220 | 30 | ≤200 |
Incoloy 825 Chemical Component:
| Grade | % | Ni | Cr | Fe | C | Mn | Si | Cu | Mo | Al | Ti | P | S |
| 825 | Min | 38 | 19.5 | Margin | 1.5 | 2.5 | 0.6 | ||||||
| Max | 46 | 23.5 | 0.05 | 1 | 0.5 | 3 | 3.5 | 0.2 | 1.2 | 0.02 | 0.03 |
