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Nickel Alloy/Titanium

Below you can find our current stock of Alloy 800H/HT (Incoloy 800HT). We Specialise in Round Bars, Hex Bars, Hex Bolts, Nuts, Washers, Wire Rods and Flanges.


ALLOY800 HT is an austenitic high-strength solid-solution Ni-Fe-Cr Alloy with controlled levels of C, Al, Ti, Si and Mg and increased content of (Al + Ti).

A special solution anneal treatment gives highest creep-rupture strength above
700 ‹C (1290 ‹F) due to the precipitation of TiC.
Below 700 ‹C (1290 ‹F), gamma prime (ƒÁL) precipitates combined with loss of ductility.
excellent creep strength at temperature above 700 ‹C (1290 ‹F)

  • good resistance to reducing, oxidizing and nitriding atmospheres and to atmospheres which alternate between reducing and oxidizing conditions
  • metallurgical stability in long-term application at high temperatures

For applications where frequent excursions to temperatures lower than 700 ‹C (1290 ‹F) during service cannot be excluded or parts of the material are permanently exposed to a temperature below 700 ‹C (1290 ‹F), the use of ALLOY800H is recommended.



Stock Form and Sizes

Round BarSpecification: ASTM B408/B564¦@ASME SB408/SB564¦@¦B564/SB564 Apply to Forged Bar Only
800H/HT Dual
1.2 1.6 2 2.6 3 3.5 4 4.4 5 5.3 6 7.1 8 8.95 10
12 13 16 18 19 20 22 24 25 28 30 32 35 36 38
š š
œ   œ œ œ   œ œ œ œ œ   œ
40 42 45 50 55 60 65 70 75 80 85 90 95 100 105
œ œ œ œ œ œ œ œ œ œ œ œ œ š  
110 115 120 125 130 135 140 145 150 160 165 170 180 190 200
š   š   š   š   š š     š   š
210 220 230 250 280 300                  
    š š                      

¦@Rolling Thread sizes available in C276(M4 to M10)

Hex BarSpecification: ASTM B446@800H/HT Dual
A/F(mm) 10 13 14 17 19 21 22 24 26 27 30 32 36
/       š š     š          


Nut & WasherSpecification: Nut JIS B1181 Class1    Washer, JIS B1256 Normal Series Grade.A
M4 M5 M6 M8 M10 M12 M16 M20 M24
  œ œ œ œ œ œ    

Sourcable Ex-Stock Material for Other Forms from Japanese Distributor

Plate Pipe Welding
Rod & Wire
Min Max
3`15mm N/A ™ N/A

¦@¢EEELimited Sizes Only@™EEEPlease enquire

Corrosion resistance

The high nickel and chromium contents of Alloy800H/HT ensure excellent resistance to oxidation.
The alloys are also very resistant to carburization, nitridation and oxidizing sulphur-bearing atmospheres.
The protective oxide film which is formed is adherent in both static and cyclic conditions of heating and cooling, and resistance to carburization is enhanced when a thin film of oxide is formed on the alloy through pre-oxidation prior to service. Resistance to hydrogen is excellent and Alloy800H/HT are standard materials used in the production of hydrogen in steam/hydrocarbon reforming processes.


Due to high strength during long periods of service and resistance to carburization and nitridation, ALLOY800H/HT have found many applications in steam/hydrocarbon reforming for components such as: pigtails, headers/collectors/manifolds, transfer piping, catalyst tubes (in lowpressure processes) and quench-system piping.

Typical applications are:

  • ethylene pyrolysis 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
  • cracking tubes used in the production of acetic anhydride and ketene - high strength, resistance to both carburization and the formation of sigma phase
  • components, e.g. heat exchangers, piping systems etc., in coal conversion plants
  • steam generator tubing in helium cooled, high temperature reactor systems ? high strength, resistance to helium and to steam

Chemical composition

  Ni Cr Fe C Mn Si Cu P S Al Ti Al+‚s‚‰
min(%) 30.0 19.0 bal. 0.06 0.5 0.2       0.30 0.30  
max(%) 32.0 22.0 0.10 1.5 0.7 0.5 0.015 0.010 0.60 0.60 1.2

Mechanical propertiesiRound Barj

  Condition Yield Strength(Mpa) Tensile Strength(Mpa) Elongation(%) Hardness(HB)
ASTM Min Value Solution Annealed 170 450 30  
Typical Values at RT Solution Annealed 245 559 40 140

Please contact us with any questions about reference or value of plate and pipe.

International Specification Comparison chart

  Material Round Bar Plate Pipe
Seamless Welded
UNS B408 B409 B407 B163
ASME N08811 SB408 SB409 SB407 SB163
JIS NCF800H NCF800HT H4553 G4901 H4552  
DIN 1.4876 1.4959 17460 17460 17459  
All the information on this website is published in good faith and for general information purpose only and not for technical design purposes. We do not make any warranties about the completeness, reliability and accuracy of this information. Any action you take upon the information on our website is strictly at your own risk. and we will not be liable for any losses and damages in connection with the use of our website.

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