Incoloy 800HT

Incoloy 800HT is a fully austenitic, low carbon, nickel-iron-chromium alloy of the same series as Incoloy 800, in which the cobalt content can be strictly controlled to less than 0.01%.

Incoloy 800HT Overview

Incoloy 800HT is resistant to many corrosive media. Its high nickel content gives it good resistance to stress corrosion cracking in aqueous corrosive conditions. The high chromium content gives it better resistance to pitting and crevice corrosion cracking. The alloy has good resistance to nitric and organic acid corrosion, but limited corrosion resistance in sulfuric and hydrochloric acids. There is good corrosion resistance in oxidizing and non-oxidizing salts, except in halides where pitting corrosion is possible. It also has good corrosion resistance in water, vapors, and mixtures of steam, air, and carbon dioxide.

Incoloy 800HT has the following characteristics

●Excellent corrosion resistance in aqueous media at very high temperatures up to 500°C

●Good resistance to stress corrosion

●Good processability

Incoloy 800HT application areas

Nitric acid condensers--resistant to nitric acid corrosion.

Steam heating tubes - good mechanical properties

●Heating element tubes - good mechanical properties

For applications up to 500°C, the alloy is supplied in the annealed condition.

Incoloy 800HT Similar grades

Z8NC32.21 (France), W Nr.1.4876, X10NiCrAlTi3220 (Germany) NA15 (UK)

Incoloy 800HT, UNS NO8811 (USA) FeNi32Cr21AlTi (ISO)

Incoloy 800HT Physical Properties

Incoloy 800HT Density

Density: ρ=8.0g/cm3

Incoloy 800HT Melting Temperature Range

Melting temperature range: 1350～1400°C

Incoloy800HT Welding

Incoloy 800HT is suitable for welding by any conventional welding process, such as tungsten electrode inert gas shielded welding, plasma arc welding, manual subarc welding, metal pole inert gas shielded welding, fusion electrode inert gas shielded welding, shielded gas arc welding and so on.

The welding of Incoloy 800HT must be carried out in the annealed state and cleaned of stains, dust and various marks.

Low heat input is used and the interlayer temperature does not exceed 150°C.

No pre- or post-weld heat treatment is required.

Welding material

GTAW/GMAW Nicrofer S 7020

W.-Nr.2.4806

SG-NiCr20Nb

AWS A 5.14 ER NiCr-3

bs 2901-na 35

SMAW

W.-Nr.2.4648

EL-NiCr19Nb

AWS A 5.11 EniCrFe-3