About Alloy
Nickel-based super alloy Incoloy 840 (Alloy 840/UNS S33400): Incoloy 840 nickel-based alloy: The Cr content in Incoloy 840 nickel-based alloy alloy is usually 18-20%, and the nickel content is 19-21%. Incoloy 840 alloy is a kind of austenitic stainless steel containing titanium and aluminum. It contains enough chromium to form and maintain a sufficient scale of chromium oxide to protect it under high temperature conditions and is more resistant to high temperatures than traditional chromium-nickel stainless steels such as 304; The higher nickel content makes it have better oxidation resistance than the standard 18-8 stainless steel, and its oxidation resistance is not inferior to higher-grade alloys whose service temperature is as high as 1900°F (1038°C) . Therefore, Incoloy 840 alloy is an ideal material for manufacturing electric heating pipes, automobile emission control systems and other high temperature resistant products.
Product Form
Bar/Forgings
Chemical Composition
| C≤ | Si≤ | Mn≤ | P≤ | S≤ | Cr≥ | Ni≥ | Mo≥ | Cu≤ |
| 0.08 | 1.00 | 1.00 | 0.040 | 0.030 | 18.0-20.0 | 19.0-21.0 | – | – |
| Other | N≤ | Al≤ | Ti≤ | Fe≤ | Co≤ | V≤ | W≤ | Nb≤ |
| – | – | 0.15-0.60 | Margin | – | – | – |
Property
| Grade | Tensile Strength MPa | Yield Strength MPa | Elongation % |
| Alloy 840 | 83(572) | 35(241) | 40 |
Application
Heating pipes, containers, baskets and chains used in sulfuric acid pickling plants.
Sea water cooling heat exchanger, marine product pipeline system, acid gas environment pipeline.
Heat exchanger, evaporator, washing, dip tube, etc. in phosphoric acid production.
Air heat exchanger in petroleum refining.
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