Alloy Grade UNS: HP-AL – Heat resistant Fe – Cr – Ni alloy

  • Overview

    HP-AL is a specialized heat-resistant alloy composed of iron, chromium, and nickel, with the strategic addition of aluminum to enhance its high-temperature performance. This alloy is designed to form a protective aluminum oxide layer at elevated temperatures, providing exceptional resistance to oxidation, corrosion, coking, and carburization. The stable alumina scale acts as a barrier against the harsh conditions encountered in high-temperature environments, ensuring the long-term integrity and performance of components. This combination of properties makes HP-AL a valuable choice for demanding applications in industries such as petrochemical processing, power generation, and heat treating, where components must operate reliably under extreme thermal and corrosive conditions.

  • Typical Uses

    Furnace rolls, heat treatment and calciner components, petrochemical furnaces.

  • MetalTek Designation

    HP-AL

  • Poured At:

    Carondelet Division, Sandusky International Division, Wisconsin Centrifugal Division, Wisconsin Investcast Division

Similar Specifications

Typical Chemical Composition (% by wt.)

Aluminum: 1.8-3.0

Carbon: 0.33-0.43

Chromium: 24-28

Manganese: 2 MAX

Iron: BAL

Copper: n/a

Nickel: 33-37

Lead: n/a

Tin: n/a

Silicon: 2.25 MAX

Zinc: n/a

Other: Nb 0.5

Minimum Mechanical Properties

Heat Treatment: Not Heat Treated

Frequently Asked Questions

Heat resistant stainless steel refers to alloys designed to maintain mechanical properties and resist oxidation at elevated temperatures.

Applications include furnace parts, heat exchangers, and components in petrochemical plants.

Heat resistant stainless steels can withstand temperatures up to 1,150°C (2,100°F), depending on the grade and exposure time.

High chromium and nickel contents stabilize the austenitic structure and form a protective oxide layer, resisting scale and oxidation.

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