Thermophysical Properties of High-Strength Low-Alloyed Pipe Steel

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Abstract

Thermo-mechanical controlled processing (TMCP) of low-carbon low-alloy pipe steels is used to attain the required level of mechanical properties in rolled plates designed for pipe production, thereby ensuring the operational stability and reliability of trunk pipelines. The TMCP involves the hot deformation of austenite followed by accelerated cooling, during which the γ → α-transformation occurs. The technological capabilities of contemporary plate mills permit developing and implementing information systems for the control of steel structure and, consequently, its properties. The reliability and accuracy of such systems can be enhanced by using the correct thermophysical parameters of steels. In the present work the critical temperatures, temperature dependences of heat capacities of main phases, and thermal effects of phase transformations in specimens of 05G2MB (wt % ~ 0.05 C; ≤2.0 Mn; ~ 0.2 Mo; ~ 0.05 Nb) high-strength low-alloyed pipe steel have been determined employing differential scanning calorimetry method, dilatometric analysis, and calculations using Thermo-Calc software. It has been demonstrated that the thermal effect of magnetic transformation exhibits a markedly greater value than that of polymorphic phase transformation.

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About the authors

N. V. Urtsev

Research and Technology Center “Ausferr”; Ural Federal University named after the First President of Russia B. N. Yeltsin; Nosov Magnitogorsk State Technical University

Author for correspondence.
Email: n.urtsev@ausferr.ru
Russian Federation, Magnitogorsk, 455000; Ekaterinburg, 620002; Magnitogorsk, Chelyabinsk Region, 455000

S. I. Platov

Nosov Magnitogorsk State Technical University

Email: n.urtsev@ausferr.ru
Russian Federation, Magnitogorsk, Chelyabinsk Region, 455000

A. V. Shmakov

Research and Technology Center “Ausferr”

Email: n.urtsev@ausferr.ru
Russian Federation, Magnitogorsk, 455000

M. A. Ryzhkov

Ural Federal University named after the First President of Russia B. N. Yeltsin

Email: n.urtsev@ausferr.ru
Russian Federation, Ekaterinburg, 620002

M. L. Lobanov

Ural Federal University named after the First President of Russia B. N. Yeltsin; Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: n.urtsev@ausferr.ru
Russian Federation, Ekaterinburg, 620002; Ekaterinburg, 620108

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2. Fig. 1. Microstructure of 05G2MB steel samples in backscattered electrons (scanning electron microscopy) after CTM: a — according to mode I, b — according to mode II.

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3. Fig. 2. Heat capacity curves during heating: a — Fe alloy–3%Si–0.5%Cu; b — armco-iron.

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4. Fig. 3. Heat capacity curves for primary (a, b) and repeated (c, d) heating; sections for determining the heat capacity equations of the phases and drawing a baseline for calculating thermal effects during repeated heating (d, e); a, c, e — sample I; b, d, e — Sample II.

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