Dexin Steel Tube (China) Co.,Ltd
Shanghai Shenhua Steel Tube Co.,Ltd
Shanghai Crystal Palace Pipe Co.,Ltd
BAOSTEEL
Shanghai Minmetals
Shangshang Desheng Group
Haitai Steel Tube
Shanghai BSW Petro-Pipe Co.,Ltd
Shanghai Tianyang Steel Tube Co.,Ltd
Yangzhou Pipe Fitting Factory Co.,Ltd
Shanghai Shenzhou Yangguang Special Tubes Co.,Ltd
Zhejiang Dewei Stainless Steel Piping Co.,Ltd
Wuhan Zhongke Innovation Technology Co.,Ltd
Shanghai Zunma Auto Pipe Co.,Ltd
Nanjing Suxia Design Group
Shanghai Baoyi Steel Pipe Co.,Ltd
