Alloy Grade UNS: HP-AF (Alumina Forming) – Heat Resistant Fe – Cr – Ni Alloy

  • Overview

    HP-AF (Alumina Forming) is a specialized heat-resistant alloy composed of iron, chromium, and nickel, with carefully selected additions that promote the formation of a protective alumina scale. This unique characteristic provides exceptional resistance to oxidation, corrosion, coking, and carburization at elevated temperatures. The alloy's ability to form a stable alumina layer makes it particularly well-suited for extremely harsh environments where components are exposed to high temperatures, corrosive gases, and carbon-rich atmospheres. HP-AF offers a valuable combination of high-temperature strength, oxidation resistance, and resistance to carburization and coking, making it an ideal choice for demanding applications in industries where these properties are critical.

  • Typical Uses

    Furnace rolls, heat treatment and calciner components, petrochemical furnaces for ethylene production.

  • MetalTek Grade

    HP-AF

Similar Specifications

Typical Chemical Composition (% by wt.)

Aluminum: n/a

Carbon: n/a

Chromium: n/a

Manganese: n/a

Iron: n/a

Copper: n/a

Nickel: n/a

Lead: n/a

Tin: n/a

Silicon: n/a

Zinc: n/a

Other: Proprietary Cr-Ni-Fe-Al alumina forming alloy designed specifically for ethylene applications

Minimum Mechanical Properties

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