Alloy 800, Uns N08810 Nickel Alloy Tube, Heat Resistant Alloy Pipe
1 . Descriptions:
Alloy 800 is an iron-nickel-chromium alloy with moderate strength and good resistance to oxidation and carburization at elevated temperatures. It is particularly useful for high-temperature equipment in the petrochemical industry because the alloy doesn't form the embrittling sigma phase after long time exposure at 1200°F (649°C). Excellent resistance to chloride stress-corrosion cracking is another important feature of alloy 800.
Alloy 800H is a solution heat treated (2100°F/1150°C), controlled-carbon version of alloy 800 with improved elevated temperature properties. It has improved creep and stress-rupture characteristics in the 1100°F (593°C) to 1800°F (982°C) temperature range.
rature properties. It has improved creep and stress-rupture characteristics in the 1100°F (593°C) to 1800°F (982°C) temperature range.
2 . Specification:
| UNS | W.Nr |
| No8800 | 1.4876 |
3 . Chemical Composition:
| Grade | ％ | Ni | Cr | Fe | C | Mn | Si | S | Al | Ti | Cu |
| 800 | Min | 30 | 19 | 39.5 | 0.15 | 0.15 | |||||
| Max | 35 | 23 | 0.1 | 1.5 | 1.0 | 0.015 | 0.6 | 0.6 | 0.75 |
| Density g/cm3 | Melting Range °C | Tensile Strength | Yield Strength |
| Rm N/mm2 | RP 0.2N/mm2 | ||
| 8.0 | 1350-1400 | 500 | 210 |
Typical applications for alloy 800 and 800H are - Heat exchangers and process piping; carburizing fixtures and retorts; furnace components; electric range heating-element sheathing; extruded tubing for ethylene and steam methane reforming furnaces; ammonia effluent coolers.
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