Full Transcript:

What’s up guys?!?! This is Michael with Michael Talks Metal back for more nickel talk today. Specifically, Incoloy 800. However, before we jump in, please consider being one of the 5% who have subscribed vs. the 95% that haven’t. It would help the channel so thank you. OH! and little good news update/segue. Michlin Metals passed our As 9120 Quality Audit! So we have now been certified for about 8 years to AS 9120 and ISO 9001. Ok, let’s do this!

Today our topic has three related alloys in the Incoloy family, Incoloy 800, 800H and 800HT.  Incoloy, like Inconel, is a registered trademark of Special Metals Corporation. Other producing mills cannot use the Incoloy name so the generic versions would not use the Incoloy name.  These Incoloy alloys are primarily composed of Nickel, Chromium, and Iron.  Initially Incoloy 800 was developed for high temperature strength and corrosion applications where stainless steels are inadequate and the much higher nickel content Inconel was a costly solution.

All these alloy  800 variations  are fully austenitic solid solutions and cannot be strengthened by heat treatment.

Applications include all sorts of furnace components, chemical and petrochemical equipment and heat exchangers. Electric heating elements are often sheathed with Incoloy 800 for corrosion and oxidation protection.

Incoloy 800 is typically limited to applications 1500 deg F and below where strength is an issue.  800H and HT maintain useful strength at higher temperatures. Corrosion and oxidation performance is consistent in all three variations.

UNS chemical composition designations are N08800 for 800, N08810 for 800H and N08811 for HT


Chemical Composition:










         30.0 – 35.0%






Chromium19.0 – 23.0 %<<
Iron39.5 % min<<
Carbon0.10 % max0.05 – 0.10%       0.06 – 0.10 %
Aluminum0.15 – 0.60 %<0.25 – 0.60 %
Titanium0.15 – 0.60 %<0.25 – 0.60 %
Aluminum + Titanium


0.30 – 1.20 %




0.85 – 1.20 %


< indicates same as alloy N08800

Grain size of  800 H and HT is ASTM 5 or coarser

Density .287 pounds per cubic inch

Room temperature permeability at 200 oersted :

1.014  in the annealed condition

Curie temperature:    minus 175 deg F

Typical room temperature mechanical properties:

Annealed  Condition

Tensile strength        65,000  psi min

Yield strength           25,000  psi min

Elongation                    30 % min



Rod, Bar, and Forgings

AMS 5766

ASTM B 408, ASTM B 564

ASME SB 408, ASME SB 564


Plate and Sheet

AMS 5871

ASTM A  240, ASTM B 409

ASME SA 240, ASME SB 409


Pipe and Tube,

ASTM B 163, ASTM B 407, ASTM B 514, ASTM B 515

ASME SB 163, ASME SB 407, ASME SB 514, ASME SB 515

Specifications often contain additional requirements  or restrictions to the chemical composition and added process requirements or testing.  So we will once again remind you to ….. CHECK THE SPECS.

Thank you for watching, this is Michael with Michael Talks Metal. Please consider subscribing if you made it this far and haven’t yet! If you have missed previous videos, click here. Thanks for tuning in, see you next Thursday 10am, Michael OUT!