Effect of tempering heat treatment on the CO₂ corrosion resistance of quench-hardened Cr-Mo low-alloy steels for oil and gas applications

Clara. Escrivà-Cerdán, Steve W. Ooi, Gaurav R. Joshi, Roberto Morana, H.K.D.H. Bhadeshia, Robert Akid

Abstract

The corrosion resistance of a variety of tempered states of two low-alloy steels, the novel HT10 (martensitic) and ASTM A182 F22 (bainitic), were evaluated in CO₂-saturated brine (T = 60°C, pH = 5.4, P_total = 1 atm) using electrochemical methods. Coincident with a drop in steel hardness, due to a decrease in dislocation density and the precipitation of alloy carbides, tempering the steels also leads to a diminution in uniform corrosion rates. This decrease is notable, particularly after tempering at higher temperature for longer holding time. For HT10, we discuss that tempering-induced changes to the microstructure contribute to decreasing the CO₂ corrosion cathodic reaction kinetics, and thus the general corrosion rate.

Corrosion Science 154 (2019) 36-48.

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