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Arkhypov O.H.,Technological Institute of the Dal East Ukrainian University | Khoma M.S.,Ukrainian Academy of Sciences | Borysenko V.A.,SeverodonetsKyi NDIKhIMMASh Open Joint Stock Company | Lipko H.V.,Technological Institute of the Dal East Ukrainian University | And 3 more authors.
Materials Science | Year: 2011

We study the changes in the properties of 09H2S + 08Kh13 bimetal from the K-6 and K-2 columns of the "LYNYK" Closed Joint-Stock Company after operation for 27 and 12 yr, respectively. At 20 and 200°C, the mechanical properties of 09H2S steel after operation are compared with the properties of the metal in the as-delivered state. It is shown that, the most informative parameters among the mechanical characteristics of the metal are σ 0.2 , σ u , and δ , and the complex quantity σ 0.2 /σ u . The relative narrowing Ψ and impact toughness are insufficiently informative due to the significant spread of the data of measurements. The long-term operation of the bimetal results in the pitting corrosion of the inner surface of the column, corrosion cracking in the heat-affected zone of welded joints, and knife-line corrosion. It is shown that the theory of dislocations adequately explains the causes and mechanism of hardening of steels operating in corrosive media. © 2011 Springer Science+Business Media, Inc.

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