Alloy Grade UNS: HL-AL – Corrosion Resistance to Hot Gases

  • Overview

    HL-AL is a high-temperature alloy that builds upon the strength of HK by offering improved corrosion resistance, especially in the presence of hot gases. The addition of chromium, along with nickel, silicon, manganese, and aluminum, enhances its ability to withstand corrosive attack at elevated temperatures. This makes HL-AL suitable for demanding applications where components encounter hot gases containing sulfur, carbon, or other corrosive elements. With a service limit of 1875 degrees Fahrenheit (1025 degrees Celsius), HL-AL provides reliable performance in challenging environments. This combination of strength, high-temperature resistance, and enhanced corrosion resistance makes it a valuable choice for specialized applications in industries where these properties are critical.

  • Typical Uses

    Calcining tubes, pier caps with temperature fixtures and hardware.

  • MetalTek Designation

    HL-AL

  • Poured At:

    Carondelet Division, Sandusky International Division, Wisconsin Investcast Division

Similar Specifications

Typical Chemical Composition (% by wt.)

Aluminum: 0.30-0.70

Carbon: 0.38-0.50

Chromium: 30-32

Manganese: 1.5 MAX

Iron: BAL

Copper: n/a

Nickel: 20-22

Lead: n/a

Tin: n/a

Silicon: 2 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.

Explore Other Alloys

Gears

Non-Ferrous

Non-ferrous alloys are, literally, materials that are not iron-based. While others may provide non-ferrous materials of other materials, the MetalTek family of non-ferrous alloys are copper-based. In general, these materials deliver high strength, and excellent wear and corrosion resistance. They are often found in marine applications and also bushing, bearing, and gear environments.
Stainless Steel Parts

Stainless Steel

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

Specialty Alloys

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.