Alloy Grade UNS: HL –  Corrosion Resistance to Hot Gases

  • Overview

    HL is a high-temperature alloy that combines the strength of HK with enhanced corrosion resistance, particularly in the presence of hot gases. This alloy maintains its structural integrity and resists degradation even under prolonged exposure to elevated temperatures and corrosive environments. Its improved corrosion resistance makes it suitable for applications where components encounter hot gases containing sulfur, carbon, or other corrosive elements. With a service limit of 1025 degrees Celsius (1875 degrees Fahrenheit), HL offers reliable performance in demanding conditions. 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

    MTEK 30-20

  • Poured At:

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

Similar Specifications

Cast UNS: N08604

Cast Grade: HL

Cast ASTM: A297, A608

Typical Chemical Composition (% by wt.)

Aluminum: n/a

Carbon: 0.20-0.60

Chromium: 28-32

Manganese: 2

Iron: n/a

Copper: n/a

Nickel: 18-22

Lead: n/a

Tin: n/a

Silicon: 2

Zinc: n/a

Minimum Mechanical Properties

Tensile, ksi

0

Tensile, MPa

0

Calculated PREn (Minimum)

0

Yield, ksi

0

Yield, MPa

0

Elongation

0%

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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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.
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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.