... of ISO9001-2008 ,API 5CT Taizhou Shaungyang Precision Seamless Steel Tube Co.,LtdIndustrial park,Jiulong Town,Hailing District,Taizhou City,Jingsu Province ... ://syjmg.en.alibaba.com http:www.syjmg.comIteamGB/T3087 seamless steel pipeTechinqueCold drawnStandardASTM,DIN,GBMarterial10#,20#,45#,16Mn,Q345,30CrMoSpec DescriptionOD ... Number:5CT-0834 and precision is ver GB/T3087 seamless steel pipe