Alloy 800/800H/800HP Technical Information
Robert-James Sales, Inc.
Robert-James Sales, Inc.
Technical Information
  Piping Definitions Tube Stainless Steel Alloys Specifications Conversion Calculators 


Alloy 20
Alloy C-276
6061 T6
Alloy 200
Alloy 400
Alloy 600
Alloy 625
Alloy 800/800H/800HP
Alloy 825


Chemical Composition %

C Cr Fe Ni Al Ti Al / Ti
.06-.10 19.0-23.0 39.5 30.0-35.0 .15-.60 .15-.60 .85-1.20

Seamless Pipe 1/2" - 8"
Welded Pipe 8" - 12"
Butt-Weld Fittings 1/2" - 8"
Flanges 1/2" - 8"
Bar 1" - 6"


ASTM B407, B514, B366, B408, B564
ASME SB407, SB514, SB366, SB408, SB564

Alloy 800 is a widely used material of construction for equipment that must resist corrosion, have high strength or resist oxidation, carburization and other harmful effects of high-temperature exposure. For high temperature applications requiring optimum creep and rupture properties Alloy 800HP is used. The Chromium in the alloy imparts resistance to oxidation and corrosion. The high Nickel content maintains an austenitic structure so that the alloy is ductile. The Nickel also contributes resistance to scaling, general corrosion and stress corrosion cracking. The iron content provides resistance to internal oxidation.

Good creep-rupture properties at temperatures above 600 deg. C (1110 deg.F) without loss of ductility during long term use at temperatures below 700 deg. C (1290 deg.F), due to limitation of (Ti & A) content to max 0.7%. However, by using 800HP with increased (Al & Ti) content to 1.2%, temperatures above 700 deg. C (1290 deg.F) can be achieved.
Good resistance to reducing oxidizing and nitriding atmospheres and to atmospheres which alternates between reducing and oxidizing conditions.
Metallurgical stability in long-term applications at high temperatures.

Steam / hydrocarbon reforming for components such as pig tails, headers, collectors, manifolds, transfer piping, catalyst tubes, and quench system piping
Ethylene pyrolsis tubing in convection and radiant sections - resistance to carburization and good mechanical properties
Ethylene dichloride cracking tubes - resistance to carburization and to dry hydrogen chloride and chlorine
Components, eg. Heat exchangers, piping systems, etc... in coal conversion plants
Steam generators tubing in helium coolant, high temperature reactor systems - high strength, resistance to helium and steam


Tensile Stength (KSI) 72.5
Yield Strength (KSI) 25

KSI can be converted to MPA (Megapascals) by multiplying by 6.895.

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