1)good quality and competitive price 2)our company get certification of ISO9001-2008 ,API 5CT Taizhou Shaungyang Precision Seamless Steel Tube Co.,LtdIndustrial park,Jiulong Town,Hailing District,Taizhou City,Jingsu Province,Chinahttp://syjmg.en.alibaba.com http:www.syjmg.comIteam GB/T8162-1999seamless steel pipeTechinqueCold drawnStandardASTM,DIN,GBMarterial10#,20#,45#,16Mn,Q345,30CrMoSpec ...