Alloy Grade UNS: 50Cr-50Ni-Cb – Nickel Based Alloy

  • Overview

    The 50Cr-50Ni-Cb alloy, also known as UNS R20501, is a high-temperature, corrosion-resistant specialty material designed for extreme environments. This nickel-chromium alloy with columbium (niobium) addition offers exceptional resistance to fuel ash corrosion, particularly against sulfur and vanadium attack. Its service limit is 1740 degrees Fahrenheit (950 degrees Celsius) and has a high heat capacity and excellent tensile strength.

  • Typical Uses

    Petrochemical furnaces.

  • MetalTek Designation

    MTEK 50-50Nb

  • Poured At:

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

Similar Specifications

Cast UNS: R20501

Wrought Grade: IN 657 (Cast)

Cast Grade: 50Cr-50Ni-Cb

Cast ASTM: A560

Typical Chemical Composition (% by wt.)

Aluminum: n/a

Carbon: 0.1

Chromium: 47-52

Manganese: 0.3

Iron: n/a

Copper: n/a

Nickel: BAL

Lead: n/a

Tin: n/a

Silicon: 0.5

Zinc: n/a

Other: Nb 1.4-1.7

Minimum Mechanical Properties

Tensile, ksi

0

Tensile, MPa

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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