Alloy Grade UNS: HK – Cast Grade HK

  • Overview

    HK is an austenitic heat-resistant alloy composed primarily of iron, chromium, and nickel, specifically formulated for high-temperature applications. This alloy exhibits excellent strength at elevated temperatures, making it suitable for demanding environments where components are exposed to extreme heat. Furthermore, HK offers good resistance to carburization and oxidation, preventing degradation and ensuring long-term performance in high-temperature processes. Its ability to withstand heat and resist carburization makes it a valuable choice for applications in reformer furnaces, pyrolysis units, and other high-temperature furnace applications where components must operate reliably under extreme conditions.

  • Typical Uses

    Calcining tubes, cement kiln parts, pier caps with temperature fixtures and hardware, radiant tubes, and retorts.

  • MetalTek Designation

    MTEK 25-20

  • Poured At:

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

Similar Specifications

Cast UNS: J94224

Wrought UNS: S31000

Wrought Grade: 310

Cast Grade: HK

Cast ASTM: A297, A608

Typical Chemical Composition (% by wt.)

Aluminum: n/a

Carbon: 0.20-0.60

Chromium: 24-28

Manganese: 2.00

Iron: n/a

Copper: n/a

Nickel: 18-22

Lead: n/a

Tin: n/a

Silicon: 2.00

Zinc: n/a

Minimum Mechanical Properties

Brinell Typical:

0

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

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%.
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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.