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 Grade
MTEK 50-50Nb
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
Heat Treatment: Not Heat Treated