The steel Cr15Ni6Mo (UHB 119) exhibits a very satisfactory corrosion resistance. However, its superior passivating ability depends on the heat treatment method used. The use of two-step tempering leads primarily to an improved resistance to reactivation and optimum properties are achieved when the basic matrix contains about 40% stable austenite in fine form. This structural state requires the use of tempering temperatures from 625 to 650 C in Step 1, and 575 C in Step 2 of tempering.

Subject
Steel structures, Manufacturing, Tempering temperature, Polarization curves, Current densities, Steel, Corrosion resistance, Electrochemical potential, Tempering, Quenching and tempering, Heat treatment, Austenite, Martensite
National Association of Corrosion Engineers
1985
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