ERW steel pipes vary from88.9mm(3") to 508mm(20"),WT:4mm-16mm. Business Type:Manufacturer Tianjin Huilitong Steel Tube Co., Ltd. is a professional manufacturer of ERW steel pipes, SSAW steel pipes. PRODUCTION SCOPESTANDARDERW PIPE/Electric Resistant Welded pipeO.D:88.9mm-508mmWT:4mm-16mm API5L(PSL1, PSL2 ), API 5CT, ASTM A53, A252, EN 10219,EN10217 ,GB/T 3091-2001, GB/T 9711.1-1997 and other ...