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Sophia Zhengzhou Huitong Pipe Fitting Co., Ltd Tel: 0086 371 60953359 Fax: +86 37...
(1)Steel grade: J55, K55, L80, N80Q, C90, T95, P110 (2)Outside diameter: 4 1/2 ", 5"...
Hebei Zhonghai Steel Pipe Manufacturing Corporation established in 1997 . It is locat...