The flat rolled metal of the grade retains its magnetic properties under all conditions. Normally, Ferritic steels do not give high temperature strength but with an additional columbium stabilisation in the alloy, there is further enhancing of the high temperature strength, creep-rupture strength and corrosion resistance properties. With appropriate heat treatment like annealing and columbium (niobium) stabilisation, the metal can give exceptional performance under load at elevated temperatures. Hence, properties like deep drawing, good weldability, and good brightness can be retained.
The dual addition of titanium and niobium enhances the welding property by restricting the formation of martensite at the heat affected zone, making the alloy ferritic at all conditions. Moreover, the carbon content (0.03%) reinforces the ductility of the alloy under all conditions. The grade has low work hardening rate, similar to other ferritic alloys, and hence the grade can be suitably deep drawn, cold formed, work stretched and machined. The grade is typically used in the gas exhaust systems due to its capability of resisting oxidation up to 900- 950°C. The chloride resistance of the grade is low, and crevice corrosion is possible depending upon chloride concentrations. With an efficient metal design, appropriate heat treatment, regular maintenance, the alloy can have commendable performance under various environments.
