Kolpino, Russia
Kolpino, Russia

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Ivanov A.Y.,ZAO Izhorskii Trubnyi Zavod | Sulyagin R.V.,ZAO Izhorskii Trubnyi Zavod | Orlov V.V.,Prometei | Kruglova A.A.,Prometei
Steel in Translation | Year: 2011

The phase transformations of austenite in the thermal-influence zone of pipe steel (strength classes X80, X90, and K70) are studied by plotting thermokinematic diagrams that simulate the thermal cycle of welding. The influence of the maximum temperature and cooling rate on the structure and properties of sections in the thermal-influence zone is established. The risk of cold crack formation and softening in the steel is assessed by means of the dependence of the hardness on the cooling rate. The results are confirmed by the correlation of the hardness and the type of structural components in laboratory and industrial samples. © 2011 Allerton Press, Inc.


Kolbasnikov N.G.,Saint Petersburg State Polytechnic University | Zotov O.G.,Saint Petersburg State Polytechnic University | Martyashov I.S.,Saint Petersburg State Polytechnic University | Sulyagin R.V.,ZAO Izhorskii Trubnyi Zavod
Steel in Translation | Year: 2012

The Bauschinger effect is investigated on samples of microalloyed pipe steel. Tests are conducted with one and several extension-compression cycles on a Gleeble-3800 system, at room temperature and elevated temperatures. The influence of temperature on the final sheet properties is considered in conditions of small alternating deformation, so as to simulate the straightening of hot-rolled sheet. The successive influence of each cycle on the final properties of the metal is demonstrated. The strength of the final strip may be modified by 150 MPa, depending on the selected straightening temperature. © 2012 Allerton Press, Inc.


Kolbasnikov N.G.,Saint Petersburg State Polytechnic University | Zotov O.G.,Saint Petersburg State Polytechnic University | Martyashov I.S.,Saint Petersburg State Polytechnic University | Sulyagin R.V.,ZAO Izhorskii Trubnyi Zavod
Steel in Translation | Year: 2012

An approach has been developed for simulating multistep plastic deformation-for example, rolling on a thick-sheet mill-by the tension-compression method. By means of the Pocket Jaw module in the Gleeble system, controlled strip rolling and pipe manufacture (including pipe fabrication, expansion, and thermocyclic polymer-coating application) may be reproduced on a single sample. At each moment in simulating rolling or pipe manufacture, the structure and properties of the steel may be investigated, and therefore the contribution of each operation to the pipe's final properties may be determined. The results show that the straightening temperature of the metal after controlled rolling makes a marked contribution to the final properties of the pipe. © 2012 Allerton Press, Inc.

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