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Cast Grade: HPNb

OVERVIEW: The addition of niobium improves stress rupture strength and carburization resistance, but lowers ductility. Service limit 1100 degrees Celsius (2010 degrees Fahrenheit).

TYPICAL USES: Petrochemical furnaces, equally well suited for reformer and ethylene furnace applications.

MetalTek Grade: MTEK 25-35Nb

Similar Specifications

Cast Grade: HPNb

Cast ASTM: A297, HP Mod (CENT, INVEST, SAND)

Typical Chemical Composition (% by wt.)

Cr: 23 - 27

Fe: Bal

Mn: 1.50 max

Ni: 32 - 37

Si: 2.00 max

C Max: 0.35 - 0.55 (Low carbon version availalble)

Other: Mo 0.50 max; Nb (Cb) 0.60 - 1.00

Minimum Mechanical Properties

Tensile, ksi: 65

Tensile, MPa: 450

Yield, ksi: 35

Yield, MPa: 240

Elongation %: 6

Heat Treatment: As Cast