We are the best manufacturer and merchant in china,and we can supply all kinds of seamless steel pipes. StandardGB6479 Chinese national standardApplicationSeamless steel tubes for high-pressure chemical fertilizer processing equipment and pipelines thereofModel No.of steel tubes10,20,16Mn,10MoWVNb,15CrMo,1Cr5Mo,12 Cr2Mo,etcDiamensional tolerances: Types of steel tubesOuter diameterWall ...