0Cr21Al6Nb High Resistance Alloy Wire with Addition of Nb element

FeCrAl -made Grade 216Nb(0Cr21Al6Nb)) resistance alloy is characterized by high resistivity, low resistance coefficient, high operating temperature, good oxidation resistance under high temperature, and a maximum applicable temperature of 1250℃. 

The Role of Niobium/Columbium (Nb/Cb) in FeCrAl Alloys

Niobium and columbium often coexist with tantalum, and their roles in alloys are similar. Niobium and tantalum partially dissolve into the solid solution, contributing to solid solution strengthening. 

When dissolved in austenite, they significantly improve the alloy's hardenability. However, when present as carbide and oxide particles, they refine the grain size and reduce the alloy's hardenability. 

They can increase the alloy's tempering stability and have a secondary hardening effect. Trace amounts of niobium can enhance the alloy's strength without affecting its plasticity or toughness.

 Due to the grain refinement effect, niobium can improve the alloy's impact toughness and lower its brittle transition temperature. 

When the niobium content is more than eight times the carbon content, it can almost completely fix all the carbon in the alloy, providing excellent hydrogen resistance. 

In austenitic alloys, niobium can prevent intergranular corrosion caused by oxidizing media. Due to its ability to fix carbon and its precipitation-hardening effect, niobium can enhance the high-temperature properties of heat-resistant alloys, such as creep strength.

In summary, the Nb element in FeCrAl alloy can improve its impact toughness, lower brittle transaction temperature, and enhance creep strength.

Key Properties of Grade 216Nb

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