Incoloy 800

General Description

Incoloy 800 is a nickel-iron-chromium alloy with good strength and excellent resistance to oxidation and carburization in high-temperature atmospheres.

A high chromium content gives Incoloy 800 good resistance to oxidation. It also resists many aqueous media and is relatively free from stress-corrosion cracking. Incoloy 800 has excellent resistance to nitric acid at concentrations up to approximately 70% and at temperatures up to the boiling point. It also has good resistance to organic acids, such as formic, acetic, and propionic. It resists a variety of oxidizing and nonoxidizing salts, but not halide salts.

Typical applications are heat treating equipment, petrochemical pyrolysis tubing and piping systems, sheathing for electrical heating elements, food processing equipment.

Chemical Composition

Grade Ni% Cr% Fe% C% Mn% S% Si% Cu% Al% Ti%
Incoloy 800 30.0-35.0 19.0-23.0 Min 39.5 Max 0.10 Max 1.50 Max 0.015 Max 1.0 Max 0.75 0.15-0.60 0.15-0.60

Designations

UNS N08800

Werkstoff Nr. 1.4876

Specifications

Incoloy 800 Wire: ISO 9724

Incoloy 800 Bar: ASTM B408

Incoloy 800 Forging: ASTM B564

Incoloy 800 Pipe/Tube: ASTM B163/B407/B755/B751

Incoloy 800 Sheet/Strip: ASTM A240/A480/B409/B609

Physical Properties

Density:8.0 g/cm3

Melting Point: 1350°C-1400 °C

Mechanical Properties

Tensile: Min 520 MPa

Yiled: Min 205 MPa

Elongation: Min 30%

Welding of Incoloy 800

Incoloy 800 has good weldability by all welding processes. Materials to be welded must be thoroughly clean, and the proper joint designs must be used.

For shielded metal-arc welding of alloy 800, the recommended welding product is ENiCrFe-2. For gas-tungsten-arc, gas-metal-arc, and submerged-arc welding, ERNiCr-3 filler wire is recommended.

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