... and Medium Pressure Boiler Tube10,20GB30875High pressure Pipe for Fertilizer Equipment10,20,16Mn,15CrMoGB64796Petroleum Cracking Tube10,20, ... TubingJ55,K55,N80,L80,T95,P110,Q125(PSL1)API 5CT11Line pipeB,X42,X52API 5LCertified by seven classification societies ... France), NK (Japan), and GL (Germany).Certified by API (the American Petroleum Institute).Our Factory specializes in the production ...