NDLI: Microstructure Identification for X80 Plates/Pipes With Low Temperature Toughness and Enhanced Strain Capacity

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Schino, Andrea Di Zheng, Lei Zhang, Chuanguo Porcu, Giorgio
Copyright Year	2014
Abstract	Due to the increasing demand for natural gas, the construction of long-distance pipelines through seismically active regions or arctic regions with ground movement caused by permafrost phenomena will become more and more necessary. To guarantee the safe operation of those pipelines, the pipe material has to fulfil strain-based design requirements. Hence in longitudinal direction low yield-to-tensile ratios, high uniform elongation values and a roundhouse shape of the stress-strain curve combined with sufficient strength values in transverse direction are essential. Moreover, a satisfactory low temperature toughness has to be guaranteed. An adequate plate metallurgical design is fundamental for appropriate pipe properties achievement. As far as concerns the plate design the understanding and the control of microstructure are the key factors, achieved by an adequate steel chemical composition and proper process parameters. In the framework of a co-operation between Baosteel and Centro Sviluppo Materiali (CSM), a project has been started aimed at manufacturing X80 strain based designed pipes. As a starting point pilot trials have been carried out at Baosteel Research Center in order to produce different microstructures. Besides the steel chemical composition, the cooling process has the most significant influence on the formation of the microstructure: in order to assess the effect of the cooling process, the same rolling schedule was adopted for producing the different test materials, obtained varying the start cooling and finish cooling temperatures. The microstructure and mechanical properties of the different test materials were assessed and the best microstructure for the plates for X80 pipes with enhanced strain capacity has been identified.
Sponsorship	Ocean, Offshore and Arctic Engineering Division
File Format	PDF
ISBN	9780791845455
DOI	10.1115/OMAE2014-23538
Volume Number	Volume 5: Materials Technology; Petroleum Technology
Conference Proceedings	ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering
Language	English
Publisher Date	2014-06-08
Publisher Place	San Francisco, California, USA
Access Restriction	Subscribed
Subject Keyword	Construction Temperature Cooling Stress-strain curves Pipelines Mechanical properties Permafrost Steel Fracture toughness Design Finishes Arctic region Plates (structures) Testing equipment Manufacturing Shapes Pipes Elongation Natural gas Low temperature
Content Type	Text
Resource Type	Article

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