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Cast Grade: HH TYP II

OVERVIEW: Sensitive to composition balance, containing enough chromium for scaling resistance at high temperature. Service Limit 980 degrees Celsius (1800 degrees Fahrenheit).

TYPICAL USES: Convection furnace components, grate bars, rabble arms, radiant tubes, refractory support hardware.

MetalTek Grade: MTEK 25-12 TYP II

Similar Specifications

Cast UNS: J93503

Cast Grade: HH TYP II

Cast ASTM: A447, HH Type II (CENT, INVEST, SAND)

Typical Chemical Composition (% by wt.)

Cr: 23.00 - 28.00

Fe: Bal

Mn: 2.50 max

Ni: 10.00 - 14.00

Si: 1.75 max

C Max: 0.20 - 0.45

Other: N 0.20 max

Minimum Mechanical Properties

Tensile, ksi: 80 (aged)

Tensile, MPa: 550 (aged)

Elongation %: 4 (aged)

Heat Treatment: Age Tensiles 24 hrs @ 1400°F [205°C] - air cool

1.05 max mag. Permeability