Manufacturing Technology 2024, 24(5):843-854 | DOI: 10.21062/mft.2024.090

Advancing the ductile behaviour of heavy-wall API X70 pipeline steel by a “Slab/Sheet” thickness ratio increase

Vadym Zurnadzhy ORCID...1,2, Yuliia Chabak ORCID...1,2, Ivan Petryshynets ORCID...2, Alexey Efremenko ORCID...1, Ivan Sili ORCID...1, Ruslan Sagirov ORCID...3, Vasily Efremenko ORCID...1,2
1 Pryazovskyi State Technical University. Gogolya 29, 49044 Dnipro. Ukraine
2 Institute of Materials Research, Slovak Academy of Sciences. Watsonova 47, 040 01 Kosice. Slovak Republic
3 Metallurgical Plant Kametstal. Soborna 18B, 51900 Kamians’ke. Ukraine

The present work was aimed at studying the effect of a “Slab/Sheet” thickness ratio (SSTR) on the microstructure and mechanical properties of API 5L X70 steel sheets intended for heavy-wall oil/gas pipelines. The 25 mm-thick and 40 mm-thick steel sheets were rolled from the cast slabs of different thicknesses (250 mm and 300 mm) and their mechanical properties were compared. The sheets were subjected to thermo-mechanical controlled processing followed by accelerating cooling, resulting in the structure of quasi-polygonal/acicular ferrite with minor amounts of granular pearlite and martensite-austenite constituents. Increasing the cast slab thickness significantly improved the ductility and low-temperature impact toughness of steel sheets regardless of their thickness. Specifically, a total elongation increased by 3-6 points (up to 26-28 %); an absorbed impact energy (tested at –20 °C) – in 1.5-1.8 times (up to 300-370 J); the DWTT shear area (at –20 °C) – in 1.6-2.1 times (up to 81-91.7 %). The properties advancement under SSTR increase was associated with an additional refinement of ferrite grains and better homogenization of cast structure under deeper hot deformation.

Keywords: X70 steel sheet, Slab thickness, TMCP, Accelerated cooling, Mechanical properties, DWTT
Grants and funding:

This work was funded by Ministry of Education and Science of Ukraine under the projects No. 0123U100374. The financial support in the framework of the Slovak Research and Development Agency project (APVV-23-0341) is greatly appreciated. Funded by the EU NextGenerationEU through the Recovery and Resilience Plan for Slovakia under the project No. 09I03-03-V01-00061 and No. 09I03-03-V01-00099

Received: July 10, 2024; Revised: November 18, 2024; Accepted: November 20, 2024; Prepublished online: November 27, 2024; Published: November 28, 2024  Show citation

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Zurnadzhy V, Chabak Y, Petryshynets I, Efremenko A, Sili I, Sagirov R, Efremenko V. Advancing the ductile behaviour of heavy-wall API X70 pipeline steel by a “Slab/Sheet” thickness ratio increase. Manufacturing Technology. 2024;24(5):843-854. doi: 10.21062/mft.2024.090.
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