Alloy Grade UNS: HN – Better Ductility

  • Overview

    HN, also known as MTEK 20-25, is an austenitic stainless-steel alloy specifically formulated for casting applications where a combination of strength and ductility is required at elevated temperatures. This alloy offers strength comparable to HT but with improved ductility, allowing for greater flexibility and resistance to cracking under stress. Its austenitic structure contributes to its good corrosion resistance and makes it suitable for high-temperature applications. With a service limit of 1800 degrees Fahrenheit (980 degrees Celsius), HN maintains its mechanical properties and resists degradation even under prolonged exposure to heat. This combination of strength, ductility, and high-temperature resistance makes HN a valuable choice for demanding casting applications where components must withstand both mechanical stress and elevated temperatures.

  • Typical Uses

    Furnace skids for slabs, furnace fixtures, radiant tubes, tube supports.

  • MetalTek Designation

    MTEK 20-25

  • Poured At:

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

Similar Specifications

Cast UNS: J94213

Cast Grade: HN

Cast ASTM: A297, A608

Typical Chemical Composition (% by wt.)

Aluminum: n/a

Carbon: 0.20-0.50

Chromium: 19-23

Manganese: 2

Iron: n/a

Copper: n/a

Nickel: 23-27

Lead: n/a

Tin: n/a

Silicon: 2

Zinc: n/a

Minimum Mechanical Properties

Tensile, ksi

0

Tensile, MPa

0

Calculated PREn (Minimum)

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

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.