... NO.VarietyNormal Steel GradeStandard NO.1Structure pipe10,20,35,45,Q235,Q295,Q345,40Cr etcGB/T81622Pipe for Liquid Transportation10, ... 15Cr1MoVGGB53104Low and Medium Pressure Boiler Tube10,20GB30875High pressure Pipe for Fertilizer Equipment10,20,16Mn,15CrMoGB64796Petroleum Cracking Tube10,20,12CrMo ... stock/warehouse with 80,000mt all kinds of seamless pipes (approx. 4000 sorts). seamless steel pipes