Research and Development of X70 with an Acicular Ferrite Microstructure for West-East Pipeline Project

It is introduced in this paper that a high strength and high toughness X70 pipeline steel with an ultra-low acicular ferrite microstructure has been researched and developed at Baosteel according to the requirements of the West-East Gas Pipeline(WEGTP) project. The developed steel has higher strength, higher toughness, lower ductile-brittle transition temperature and higher dynamic tear-resistance than the conventional X70 with ferrite and pearlite microstructure. The excellent properties of the steel are benefited from ultralow carbon acicular ferrite consisting of interaction of very fine precipitated particles and high-density dislocation. And the steel has been applied on the WEGTP in China.

Research and Development of X70 with an Acicular Ferrite Microstructure for West-East Pipeline Project

It is introduced in this paper that a high strength and high toughness X70 pipeline steel with an ultra low acicular ferrite microstructure has been researched and developed at Baosteel according to the requirements of the West East Gas Pipeline(WEGTP) project. The developed steel has higher strength, higher toughness, lower ductile brittle transition temperature and higher dynamic tear resistance than the conventional X70 with ferrite and pearlite microstructure. The excellent properties of the steel are benefited from ultra-low carbon acicular ferrite consisting of interaction of very fine precipitated particles and high-density dislocation. And the steel has been applied on the WEGTP in China.