Alloy Grade UNS: HC – Resists Oxidation

  • Overview

    HC, also known as MTEK 29-4, is a specialized alloy primarily prized for its exceptional resistance to oxidation and high-sulfur flue gases, making it well-suited for challenging environments where these factors are a concern. While its mechanical properties are limited, restricting it to low-stress applications, its high chromium content (up to 30%) contributes significantly to its oxidation and corrosion resistance. With a service limit of 1200 degrees Fahrenheit (650 degrees Celsius), HC maintains its integrity and resists degradation even under prolonged exposure to heat and corrosive gases. This combination of properties makes HC a valuable choice for specialized applications where oxidation and corrosion resistance are paramount, even if high strength is not a primary requirement.

  • Typical Uses

    Flue gas, furnace fixtures, gas dampers, recuperator tubes, salt pots, support skids, tuyeres.

  • MetalTek Grade

    MTEK 29-4

  • Poured At:

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

Similar Specifications

Cast UNS: J92605

Cast Grade: HC

Cast ASTM: A297

Typical Chemical Composition (% by wt.)

Aluminum: n/a

Carbon: 0.5

Chromium: 26-30

Manganese: 1

Iron: n/a

Copper: n/a

Nickel: 4 MAX

Lead: n/a

Tin: n/a

Silicon: 2

Zinc: n/a

Minimum Mechanical Properties

Tensile, ksi

0

Tensile, MPa

0

Calculated PREn (Minimum)

0

Heat Treatment: Not Heat Treated

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