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Alloy 800 / 800H / 800HT Nickel Plate - AMS 5871, UNS N08810, N08811


Incoloy® 800, 800H and 800HT are nickel-iron-chromium alloys that provide high strength and excellent resistance to oxidation and carburization at high temperatures.  They offer excellent corrosion resistance in many aqueous environments and are useful in many applications that involve long-term exposure to elevated temperatures. Their nickel content makes the alloys highly resistant to both chloride and stress-corrosion cracking.  Alloy 800, 800H and 800HT are identical except for the higher level of carbon in 800H and the controlled range of aluminum and titanium for grade 800HT.  

Standard Inventory Specifications 

  • UNS N08810
  • UNS N08811
  • AMS 5871
  • ASTM B 409
  • ASTM SA 240
  • W.NR/EN 1.4958
  • W.NR/EN 1.4959

Common Trade Names

  • Incoloy 800 / 800H / 800HT (® Special Metals)
  • ATI 800 (™ Allegheny Technologies)

Common Applications of 800H / HT Stainless Steel

  • Petrochemical equipment for heat exchangers, such as in ethylene or vinyl chloride production
  • Steam/hydrocarbon reforming for catalyst tubing, manifolds, and quenching system tubing
  • Hydrogenation heat tubing
  • Power generation for steam superheating tubing
  • High temperature heat exchangers in gas cooled nuclear reactors

Inventory Size Range

  • Plate : 0.1875" - 0.5000"

Please contact us for more details.

The technical data provided is for information only and not for design purposes. It is not warranted or guaranteed.

Alloy 800H / HT Chemical Properties

  Percent By Weight
Element 800H 800HT
Nickel 30.0 - 32.0 30.0 - 32.0
Chromium 19.0 - 22.0 19.0 - 22.0
Iron Bal. - Bal. Bal. - Bal.
Carbon 0.06 - 0.08 0.06 - 0.10
Manganese 0.5 - 1.0 0.5 - 1.0
Silicon 0.2 - 0.6 0.2 - 0.6
Copper 0.5 Maximum 0.5 Maximum
Phosphorus 0.015 Maximum 0.015 Maximum
Sulfur 0.010 Maximum 0.010 Maximum
Aluminum 0.20 - 0.40 0.30 - 0.60
Titanium 0.20 - 0.50 0.60 - 0.60
Aluminum + Titanium 0.7 Maximum 0.85 - 1.2

 

 

Alloy 800H / HT Physical Properties

  • Density: .287 lb/in3
  • Melting Range: 2475-2525°F
  • Specific Heat Btu/lb-°F: 0.12
  • Poisson's Ratio at 75°F: .339
  • Modulus of Elasticity, Tensile Modulus at 75°F: 28.5 psi x 106

Linear Coefficient of Thermal Expanison

Temperature, °F 70-200 70-300 70-400 70-500 70-600 70-800 70-1000 70-1200 70-1400
µm/°F 7.9 8.4 8.6 8.8 9.0 9.2 9.4 9.6 9.9

 

Thermal Conductivity

Temperature, °F 70 70-800 70-1800
Btu/h-ft-°F 6.7 10.6 17.8

 

Mechanical Properties and Yield Strength of Alloy 800H / HT

Temperature, °F 70 1000 1200 1400 1600 1800
0.2% Yield Strength, psi 29,000 16,500 14,800 14,400 11,600 8,900
0.2% Yield Strength, MPa 200 114 102 99 80 61
Ultimate Tensile Strength, pso 77,000 63,500 55,700 32,300 18,600 10,200
Ultimate Tensile Strength, MPa 531 438 384 223 128 70
Elongation, % 52 51 50 78 120 120

 


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