Alloy 800HT
About Alloy 800HT
What is Alloy 800HT?
Alloy 800HT also referred to as the UNS N08811/W.Nr. 1.4959 alloy.
Alloy 800HT is an iron-nickel-chromium alloy having the same basic composition as alloy 800, with significantly higher creep rupture strength.
Alloy 800HT has a restricted chemistry, within the limits of alloy 800H, and requires a heat treatment of 2100°F (1149°C) minimum. The carbon is 0.06 to 0.10% (alloy 800H is 0.05 to 0.10%), the Al + Ti is 0.85 to 1.20% (alloy 800H is 0.30 to 1.20% Al + Ti).
Alloys 800H and 800HT are available in all standard mill forms including rod, bar, plate, sheet, strip, shapes, and tubular products.
Alloy 800HT Standards
ASTM B407
-Seamless Pipe & Tube
ASTM B514
-Welded Pipe & Tube
ASTM B408
-Rod & Bar
ASTM A240
-Plate, Sheet, Strip & Foil
Alloy 800HT Chemical Composition
Alloy 800HT Data Sheet
Alloy 800HT Equivalent Grades
| STANDARD | WERKSTOFF NR. | UNS | GOST | AFNOR | JIS | BS | EN | OR |
| Alloy 800HT | 1.4959 | N08811 | – | – | – | – | – | – |
Alloy 800HT Mechanical Properties
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 7.94 g/cm3 | 1385 °C (2525 °F) | 250-550Mpa | 90-150Mpa | 45% – 15% |
Alloy 800HT Physical Properties
| Melting Range | Specific Heat, 20°C (J/(g.K)) | Magnetic Permeability (20°C) | Thermal Conductivity, 20°C (W/(m.K)) | Curie Temperature (°C) |
| 1385 °C (2525 °F) | 460 | ＜1.009 | 11.5 | -115 |
Alloy 800HT Applications
Alloy 800HT Related Resources
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