• N08810
  • 1.4958

ALLOY 800H / INCOLOY 800H

Alloy 800H / Incoloy 800H is a controlled composition derivative of INCOLOY® alloy 800 (UNS N08800). Applications have extended from petrochemical processing reformer tubing, to bellows and flare tips in refinery service. 

Key properties

(in annealed condition)
Tensile strength: 54.00–77.00
Yield strength: 13.00–21.00
Elongation: 13.00–23.00%
   

Fe

39.50% min

Ni

30.00-35.00%

Cr

19.00-23.00%

Mn

1.50% max

Si

1.00% max

Cu

0.75% max

Al+Ti

0.30-1.20%

Al

0.15-0.60%

Ti

0.15-0.60%

C

0.05-0.10%

S

0.01% max

ALLOY 800HT / INCOLOY 800HT

Alloy 800HT / Incoloy 800HT is a controlled composition derivative of INCOLOY® alloy 800H (UNS N08810) and is used for the same creep resistant applications, however the combined effects of mechanical and thermal processing of the alloy permit higher design stresses to be incorporated than are permitted for the conventional alloy. 

Key properties

(in annealed condition)
Tensile strength: 54.00–77.00
Yield strength: 13.00–21.00
Elongation: 18.00–23.00%

Fe

39.50% min

Ni

30.00-35.00%

Cr

19.00-23.00%

Mn

1.50% max

Si

1.00% max

Al+Ti

0.85-1.20%

Cu

0.75% max

C

0.06-0.10%

Al

0.25-0.60%

Ti

0.25-0.60%

S

0.01% max

INVENTORY

Product form Size range from Size range to
Alloy 800H pipe 0.5 in 8 in
Alloy 800H tube 12 mm 260 mm
Alloy 800H pipe fittings 0.5 in 8 in
Alloy 800H flanges 0.5 in 8 in
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APPLICATIONS

heat-exchangers

Alloy 800H can be used in a variety of applications

  • Ethylene furnace quench boilers
  • Hydrocarbon cracking
  • Valves, fittings and other components exposed to corrosive attack from 1100-1800° F
  • Industrial furnaces
  • Heat-treating equipment
  • Chemical and petrochemical processing
  • Super-heater and re-heaters in power plants
  • Pressure vessels
  • Heat exchangers

ABOUT ALLOY 800H / INCOLOY 800H

INCOLOY 800H is a controlled composition derivative of INCOLOY® alloy 800 (UNS N08800). Applications have extended from petrochemical processing reformer tubing, to bellows and flare tips in refinery service. Power generation, superheater and reheater tubing have also employed the material. Heat treatment retorts, muffles jigs and fixtures have also used this material to great effect.

To learn more about our stock of Alloy 800H pipe and tube contact us, or fill in our online quote request form and one of our team will get back to you.

Properties of Alloy 800H

DENSITY    7.94 g/cm³ | 0.287 lb/in³
MELTING POINT 1357-1385°C | 2475-2525°F

ABOUT ALLOY 800HT / INCOLOY 800HT

The combined effects of mechanical and thermal processing of Incoloy Alloy 800HT permit higher design stresses to be incorporated than are permitted for the conventional Alloy 800H. Both materials remain available, subject to commercial considerations, and certain specifications which restrict the service temperature of some grades of INCOLOY® alloy 800H. Incoloy Alloy 800HT applications have extended from petrochemical processing reformer tubing, to bellows and flare tips in refinery service. In power generation, superheater and reheater tubing has also employed the material.

Heat treatment retorts, muffles jigs and fixtures have also used this material to great effect.

To learn more about our stock of Alloy 800HT pipe and tube contact us, or fill in our online quote request form and one of our team will get back to you.

Properties of Alloy 800HT

DENSITY    7.94 g/cm³ | 0.287 lb/in³
MELTING POINT 1357-1385°C | 2475-2525°F

Applications

heat-exchangers

Alloy 800HT can be used in a variety of applications

  • Ethylene furnace quench boilers
  • Hydrocarbon cracking
  • Valves, fittings and other components exposed to corrosive attack from 1100-1800° F
  • Industrial furnaces
  • Heat-treating equipment
  • Chemical and petrochemical processing
  • Super-heater and re-heaters in power plants
  • Pressure vessels
  • Heat exchangers

ALLOY H/HT MECHANICAL PHYSICAL PROPERTIES

h Property 21°C 537.8°C 649°C 760°C 871°C 982°C
Ultimate Tensile Strength /MPa 530.9 437.8 384 222.7 128.2 70.3
0.2% Yield Strength /MPa 199.9 113.8 102 99.3 80 61.4
Elongation % 52 51 50 78 120 120
Minimum Creep 0.0001% per hr - - - 41.4 24.8 7.2
10,000 hr Rupture Strength - - - 50.3 24.1 8.3
Coefficient of Thermal Expansion /µm/m°C - - - 17.8 18.4 -
Thermal Conductivity /kcal/(hr.m.°C) 10 - - 20.5 22.5 26.5
Modulus of Elasticity / GPa 1.97 - - 1.45 1.32 -
HT PROPERTY            
Ultimate Tensile Strength /ksi 54.00-77.00          
0.2% Yield Strength /ksi 13.00-21.00          
Elongation % 18.00-23.00          

Alloy 800H Specifications

UNS Number N08810
WNR Number 1.4958
Standards ASTM B 409, B 408, B 407, B 564

Alloy 800HT Specifications

UNS Number N08811
WNR Number 1.4876/1.4959
Standards ASTM B 409, B 408, B 407, B 564

Welding Consumables

WELDING ELECTRODES INCOWELD A
FILLERS

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