Alloy Grade UNS: HD – Higher Nickel

  • Overview

    HD is a specialized alloy designed for high-temperature applications where resistance to sulfur-containing gases is crucial. Its higher nickel content contributes to enhanced strength, allowing it to maintain structural integrity and resist deformation at elevated temperatures. This alloy excels in environments with high-sulfur process gases, resisting corrosion and degradation even under prolonged exposure. With a service limit of 700 degrees Celsius (1300 degrees Fahrenheit), HD provides reliable performance in demanding conditions. Its combination of strength, high-temperature resistance, and resistance to sulfur-containing gases makes it a valuable choice for specialized applications in industries where these properties are critical.

  • Typical Uses

    Cement kiln parts, gas parts, holding pots, pour spouts, rabble arms.

  • MetalTek Designation

    MTEK 27-5

  • Poured At:

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

Similar Specifications

Cast UNS: J93015

Cast Grade: HD

Cast ASTM: A297, A608

Typical Chemical Composition (% by wt.)

Aluminum: n/a

Carbon: 0.5

Chromium: 26-30

Manganese: 1.5

Iron: n/a

Copper: n/a

Nickel: 4.0-7.0

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 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.