In October 2011, the U.S. Department of the Treasury initiated an investigation into the countervailing case in accordance with the regulations of the British Steel Works, V&MStar, TMKIPSCO and the British Steel Workers Council. At that time, senior officials of the Ministry of Commerce of the People's Republic of China stated that they blindly followed the trend to accuse my country of countervailing or subsidies for imported goods, which lacked objective factual basis, and my country decisively resisted this matter.

The seamless steel pipe structure currently used in the project can be classified according to the cross-sectional shape, structural form and manufacturing method. According to the cross-sectional form, seamless steel pipe structure can be divided into three types: round pipe structure (CHS), square