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

  • Overview

    Alumina forming, heat resistant Fe - Cr - Ni alloy with additions to form an aluminum scale for extreme oxidation, corrosion, coking, and carburization resistance at high temperatures.

  • 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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Stainless steels owe their ability to resist corrosion primarily to the presence of a passive film on their surface. Chromium is chiefly responsible for formation of the passive film. Iron ceases to rust at approximately 12% chromium content and resistance to oxidizing corrosives increases rapidly with chromium content up to approximately 20%.
Petrochemical Fittings

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Specialty Alloys comprise a broad group of materials that deliver properties for more demanding applications, use more exotic or expensive materials, or require special processes to manufacture. Where standard materials may not offer desired performance, specialty alloys (including those that are modified further) may be a sensible selection.