Difference Between Inconel 800 and Incoloy 800

Incoloy 800 also known as Inconel 800 which is nickel-iron-chromium alloys with good strength and excellent resistance to oxidation and carburization in high-temperature exposure. The nickel content makes Incoloy800 highly resistant to both chloride stress-corrosion cracking and to embrittlement from precipitation of sigma phase. The general corrosion resistance is excellent. In the solution annealed condition, alloys 800H and 800HT have superior creep and stress rupture properties.

Incoloy 800 is mainly in demand by applications with temperatures up to 1100° F, where alloys 800H and 800HT are normally used in temperatures above 1100° F where resistance to creep and rupture is required. The chemical balance allows the nickel steel alloy to exhibit excellent resistance to carburization, oxidation and nitriding atmospheres.

Incoloy 800

Inconel 800, Incoloy 800

AMS 5871, ASTM B409, AMS 5877, BS 3072NA15, BS 3073NA15, DIN 17460, EN 10028-7, EN 10095

Stock Size: Thickness: 0.025"~3.00"

Width & Length: 36" X 120" or 48" X 144"

Inconel 800, Incoloy 800 Tubing

Standards: ASTM-B-163, ASTM-B-407, ASTM-B-514, ASTM B829, ASTM-B-775, ASTM-B-515, ASTM-B-751, BS3 3074NA15, ISO 6207, DIN 17459

Stock Size: OD 1/16"~3", Wall: 0.010"~0.250", Length: 17'/24' FT R/L

3/8" OD x 0.049" Wall x 20 FT

1/4" OD x 0.049" Wall x 20 FT

Inconel 800, Incoloy 800 Pipe

Standards:ASTM-B-514, ASTM B829, ASTM B775, ASTM B515, ASTM B751, BS3 3074NA15, ISO 6207, DIN 17459

Stock Size: 1/4" sch 10 to 16" sch 80

Inconel 800, Incoloy 800 Bar

Standards: AMS 5766, ASTM-B-408, ASME-B-408, ISO 9723, ISO 9724, BS 3076NA15, BS 3075NA15, EN 10095

Stock Size: 1/4" Diameter to 3" Diameter

In what forms is Incoloy® 800H/HT available at Steel Tube India?

  • Sheet
  • Plate
  • Bar
  • Pipe & Tube (welded & seamless)
  • Fittings (i.e. flanges, slip-ons, blinds, weld-necks, lapjoints, long welding necks, socket welds, elbows, tees, stub-ends, returns, caps, crosses, reducers, and pipe nipples)
  • Wire

What are the characteristics of Incoloy 800H/HT?

  • High temperature strength
  • High creep rupture strength
  • Resistant to oxidation and carburization in high temperature environments
  • Good corrosion resistance in many acidic environments
  • Good resistance to many sulfur-containing atmospheres

Alloy 800 (UNS N08800) Chemical Composition, %

Ni Cr Fe C Al Ti Al+Ti
30.0-35.0 19.0-23.0 39.5 min .10 max .15-.60 .15-.60 .30-1.20

Alloy 800H (UNS N08810) Chemical Composition, %

Ni Cr Fe C Al Ti Al+Ti
30.0-35.0 19.0-23.0 39.5 min .05-.10 .15-.60 .15-.60 .30-1.20

Alloy 800HT (UNS N08811) Chemical Composition, %

Ni Cr Fe C Al Ti Al+Ti
30.0-35.0 19.0-23.0 39.5 min .06-.10 .25-.60 .25-.60 0.85-1.2

*Note that the chemical composition of Incoloy 800HT will always be within the limits of Incoloy 800H.

*Note the limits of Incoloy 800H may or may not be within the limits of Incoloy 800HT.

In what applications is Incoloy 800H/HT used?

  • 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

ASTM Specifications

Alloy Pipe Smls Pipe Welded Tube Smls Tube Welded Sheet/Plate Bar Forging Fitting
Alloy 800 (UNS N08800) B407 B154 B163 B515 B409 B408 B564 B366
Alloy 800H (UNS N08810) B407 B154 B163 B515 B409 B408 B564 B366
Alloy 800HT (UNS N08811) B407 B154 B163 B515 B409 B408 B564 B366

Mechanical Properties
Typical room temperature Tensile Properties of Annealed Material

Product Tensile (ksi) .2% Yield (ksi) Elongation (%)
Rod & Bar 75-100 30-60 60-30

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