Alloy Grade UNS: HF – Chromium, Nickel and Carbon

  • Overview

    HF, also known as MTEK 20-10, is a carefully balanced austenitic stainless-steel alloy designed for high-temperature applications demanding both strength and corrosion resistance. Its precisely controlled composition of chromium, nickel, and carbon ensures a stable austenitic microstructure, preventing the formation of detrimental sigma phase that can cause embrittlement at elevated temperatures. This makes HF particularly well-suited for prolonged service in the 1200 to 1600 degrees Fahrenheit range, where it maintains its strength, ductility, and corrosion resistance even after extended exposure. This combination of properties makes HF a valuable choice for demanding applications in industries like heat treating, power generation, and chemical processing, where components must operate reliably under high-temperature conditions.

  • Typical Uses

    Annealing boxes, annealing furnace components, burner tips, burnishing rolls, convection furnace components, and gas burner rings.

  • MetalTek Grade

    MTEK 20-10

  • Poured At:

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

Similar Specifications

Cast UNS: J92603

Wrought Grade: 302

Cast Grade: HF

Cast ASTM: A297, A608

Typical Chemical Composition (% by wt.)

Aluminum: n/a

Carbon: 0.20-0.40

Chromium: 18-23

Manganese: 2

Iron: n/a

Copper: n/a

Nickel: 8.0-12.0

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

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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 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.