API line pipe Class B diameter 60--630 * 2 - 40 Standard:GB,DIN Section Shape:Round Application: oil pipe,gas pipe Technique: Hot RolledStandard:GB,DINSection Shape:RoundApplication: oil pipe,gas pipeTechnique: Hot RolledCertification: APISurface Treatment:GalvanizedSpecification:API 5L,5CT,J55,K55,N80OD:60-630mmGrade:10#,20#,45#,API K55,API N80