Tianjin Zhongshun Petroleum Steel Pipe Co.,Ltd Standard:GB/T3091,GB/T9711,API 5L (PSL1,PSL2) 5CT,ASTM A252 and so on. Material: Q195-Q345A,B,L175-L485,x42-X70,J55,K55 Size:ERW: φ21.3mm- φ457.2mm *0.7-15.75mm SSAW : ф219mm-ф3048mm*3.5-28mm Certificate:API 5L-0619,5CT-0898 ;ISO,CE so on.
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