... polishing 4,we can process the finished products. Our company is equiped with testing instruments, which can ensure the ... from TangGu Port. It is in Daqiuzhuang Steel pipe manufacturing base,Tianjin Yu Xing Steel Tube Co.,Ltd is ... , together with Tianjin Hengxing Metallurgical Machinery Manufacturing Company , Tianjin Quanshengxing Steel Materials Sales Company, and Tianjin Big Straight Seam Steel Pipe ...