Alloy Grade UNS: HK 40 – Resistance to Oxidizing

  • Overview

    HK 40 is a high-temperature stainless steel alloy specifically engineered for demanding applications where both strength and corrosion resistance are crucial. This alloy exhibits enhanced strength compared to other high-temperature materials, making it suitable for highly stressed components in elevated temperature environments. HK 40 offers good resistance to both oxidizing and reducing process flows, ensuring its suitability for a variety of challenging conditions. Furthermore, it provides good general corrosion resistance, protecting it from degradation in harsh environments. With a service limit of 1875 degrees Fahrenheit (1025 degrees Celsius), HK 40 maintains its structural integrity and resists degradation even under prolonged exposure to heat. Its good weldability and castability further enhance its versatility, making it suitable for complex fabrication and integration into various systems.

  • Typical Uses

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

  • MetalTek Designation

    MTEK HK40

  • Poured At:

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

Similar Specifications

Cast UNS: J94204

Cast Grade: HK 40

Cast ASTM: A297, A351, A608

Typical Chemical Composition (% by wt.)

Aluminum: n/a

Carbon: 0.35-0.45

Chromium: 23-27

Manganese: 1.5

Iron: n/a

Copper: n/a

Nickel: 19-22

Lead: n/a

Tin: n/a

Silicon: 1.75

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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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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