Improvement of Low-Alloy Pipe Steel Sulfide Stress Cracking Resistance


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Abstract

The influence of sheet microstructure formed by various thermomechanical processing schedules on sulfide stress cracking (SSC) resistance under uniaxial tension for low-alloy pipe steels grades X42–X65 is studied. A favorable role is established for substitution of a ferritic-pearlitic by a ferritic-bainitic microstructure and improvement of structural component dispersion is established. The favorable effect is facilitated by using high intensity post-deformation cooling from the austenite region. It is shown that segregation bands and non-metallic inclusions in a sheet axial zone do not affect the duration of specimens withstanding SSC, but they can lead to formation of hydrogen cracks (HIC) on a specimen surface that is a defective feature. In order to prevent crack formation in a specimen surface and premature failure it is necessary to lay down high specifications for specimen gauge length and fillet surface quality.

About the authors

A. A. Kholodnyi

FGUP I. P.Bardin TsNIIchermet

Author for correspondence.
Email: kholodnyi.aa@gmail.com
Russian Federation, Moscow

Ya. S. Kuznechenko

FGUP I. P.Bardin TsNIIchermet

Email: kholodnyi.aa@gmail.com
Russian Federation, Moscow

Yu. I. Matrosov

FGUP I. P.Bardin TsNIIchermet

Email: kholodnyi.aa@gmail.com
Russian Federation, Moscow

M. V. Il’ichev

FGBUN Joint High Temperature Institute, Russian Academy of Sciences

Email: kholodnyi.aa@gmail.com
Russian Federation, Moscow

D. I. Yusupov

FGBUN Joint High Temperature Institute, Russian Academy of Sciences

Email: kholodnyi.aa@gmail.com
Russian Federation, Moscow

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