The paper investigates the microstructure formation, mechanical properties, and cold resistance of the grade X70 low-carbon steel after lengthwise and cross rolling. It is shown that the elongated grains forming in the steel structure after lengthwise rolling, have a large quantity of low-angle grain boundaries and the {001}<110> crystallographic plane orientation that lead to a significant increase in the steel microhardness and strength properties (1050 MPa) and a decrease in the plasticity, notch toughness (25 J/cm2 at –70°C), and cold resistance of V-notch specimens. Although the additional steel tempering after lengthwise rolling promotes the decrease in the microhardness and strength properties (900 MPa), the plasticity and notch toughness increase up to 15% and 195 J/cm2, respectively. After cross rolling, the notch toughness of V-notch specimen remains high (260 J/cm2) at –70°C test temperature due to the formation of a small amount of 3.3 μm equiaxial disperse perlite grains and more uniform distribution of the structure components and <110> axial texture.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 10, pp. 104–110, October, 2021.
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Gordienko, A.I., Pochivalov, Y.I., Vlasov, I.V. et al. Structure Formation and Mechnical Properties of Low-Carbon Steel After Lengthwise and Cross Rolling. Russ Phys J 64, 1899–1906 (2022). https://doi.org/10.1007/s11182-022-02539-y
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DOI: https://doi.org/10.1007/s11182-022-02539-y