General Description

Incoloy 800H is similar to alloy 800 but with improved creep and stress-rupture properties for applications above 650 °C (1200 °F). Resistant to high-temperature oxidation, carburization, and nitridation, it is widely used in petrochemical and thermal processing.

Incoloy 800HT is similar to alloy 800H but with even more precisely controlled composition.

Alloys 800H and 800HT are the standard materials for intermediate temperatures (620–925 °C, or 1150–1700 °F). These alloys combine corrosion resistance with strength and metallurgical stability. Major applications include hydrogen reformer manifolds and pigtail piping, ethylene dichloride furnace tubing, transfer piping, and high-temperature pressure vessels.

Chemical Composition

Grade Ni% Cr% Fe% C% Mn% Si% Cu% S% AL% Ti% Al+Ti%
Incoloy 800H 30.5-35.0 19.0-23.0 Bal. 0.05-0.10 Max 1.5 Max 1.0 Max 0.75 Max 0.015

0.15-0.60

0.15-0.60 0.30-1.20
Incoloy 800HT 30.0-35.0 19.0-23.0 Bal. 0.06-0.10 Max 1.5 Max 1.0 Max 0.75 Max 0.015

0.25-0.60

0.25-0.60 0.85-1.20

Specifications

Grade UNS Werkstoff Nr.
Incoloy 800H N08810 1.4958
Incoloy 800HT N08811 1.4959

Physical Properties

Grade Density Melting Point
Incoloy 800H/800HT 8.0 g/cm3 1370°C-1400 °C

Mechanical Properties

Alloy Tensile Strength Yield Strength Elongation
Incoloy 800H/800HT 450 N/mm² 170 N/mm² 35%

Our Production Standard

  Bar Forging Sheet/Strip Wire
Standard ASTM B408 ASTM B564 ASTM B409  

Size Range

Incoloy 800H and Incoloy 800HT wire, bar, rod, strip, forging, plate, sheet, tube, fastener and other standard forms are available.

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