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The Effect of Nonmetal Inclusions and Microstructure on Local Corrosion of Carbon and Low-alloyed Steels I. I. Reformatskaya*, I. G. Rodionova**, Yu. A. Beilin***, L. A. Nisel’son***, and A. N. Podobaev* * Karpov Institute of Physical Chemistry, ul. Vorontsovo Pole 10, Moscow, 103064 Russia e-mail:
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** Bardin Central Research Institute of Ferrous Metallurgy, Moscow, Russia *** Oil Company YuKOS, Moscow, Russia Received March 23, 2004 Abstract — The resistance of carbon and low-alloyed steels to local corrosion is shown to be directly determined by their phase-structure, rather than chemical, composition. A correlation between the presence of various nonmetal inclusions in steels and the local corrosion rate is revealed. Inclusions containing Ca and S are shown to be the most corrosive, manganese sulfide inclusions act less corrosively, and silicates are the least active. The formation of lamellar pearlite in the steel structure also impairs its resistance to local corrosion. By providing metal pure of corrosive nonmetallic inclusions at a melting stage and ensuring the pearlite spheroidizing during the stages of thermal treatment and processing, it is possible to enhance its resistance to total and local corrosion.
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