... 5CT license Number:5CT-0834 and precision is ver Taizhou Shaungyang Precision Seamless Steel Tube Co.,LtdIndustrial park,Jiulong ... en.alibaba.com http:www.syjmg.comIteamGB/T3087 seamless steel pipeTechinqueCold drawnStandardASTM,DIN,GBMarterial10#,20#,45#,16Mn,Q345 ... BK ,BKS, NBK ,BKW GBKApplicationStructure,transport gas and oil, making machine part,extCertificationISO9001-2008,API Spec ...