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Change in Properties of Pipe Steel with Two-Phase Structure During Low-Temperature Heating and Subsequent Plastic Deformation

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Metallurgist Aims and scope

Results are given for evaluation of the effect of longitudinal deformation on the change of the mechanical properties and steel properties with a two-phase pipe metal structure previously given low-temperature heat treatment simulating application of an anticorrosion coating. A reduction in steel deformation capacity to the minimum permissible level is evaluated by a criterion δun ≥ 3% and σy(Rt0.5)/σu ≤ 0.96–0.98. As a result of testing plates subjected to longitudinal tension with plastic deformation εp = 1.5–7.0%, it is shown that exhaustion of steel deformation capacity is predicted in the transverse direction with preliminary deformation εp ≈ 5%, and in the longitudinal direction with εp ≈ 4–5%. SEM and TEM methods are used to study the effect of steel main structural characteristics whose presence facilitates retention of capacity for steel strain hardening after heating (200–220°C, 5 min): fine islands of twinned martensite, fine cementite particles and abundant precipitation of nanosize particles of Nb and V carbonitrides. During branch pipe bending deformation (εp ≤ 3.0%) in a two-phase steel structure (main components are ferrite and lath martensite) includes transformation of residual austenite from the MA-component in twinned martensite.

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Authors and Affiliations

  1. Pipe Producers Association, Moscow, Russia

    I. P. Shabalov

  2. Pipe Innovative Technologies, Moscow, Russia

    I. P. Shabalov, S. Yu. Nastich, V. Ya. Velikodnev, E. V. Yakushev & V. S. Kalenskii

  3. Bardin Central Research Institute of Ferrous Metallurgy (TsNIIchermet), Moscow, Russia

    G. A. Filippov & M. Yu. Matrosov

Authors
  1. I. P. Shabalov
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  2. S. Yu. Nastich
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  3. V. Ya. Velikodnev
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  4. G. A. Filippov
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  5. M. Yu. Matrosov
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  6. E. V. Yakushev
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  7. V. S. Kalenskii
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Correspondence to I. P. Shabalov.

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Translated from Metallurg, No. 8, pp. 75–82, August, 2017.

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Shabalov, I.P., Nastich, S.Y., Velikodnev, V.Y. et al. Change in Properties of Pipe Steel with Two-Phase Structure During Low-Temperature Heating and Subsequent Plastic Deformation. Metallurgist 61, 686–693 (2017). https://doi.org/10.1007/s11015-017-0550-5

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  • DOI: https://doi.org/10.1007/s11015-017-0550-5

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