... have the API(API5L, API5CT) and ISO Certificates .Used for oil pipeline, oil natural gas, gas, water transportation oil c ... We have the API(API5L, API5CT) and ISO Certificates .Used for oil pipeline, oil natural gas, gas, water transportationoil casing ... Other Material Can Be Ordered)StandardBS, GB, ASTM,DIN,APIUsageUsed For Liquid Or Structure PIPE SurfaceBared , copper coated , Galvanized Or With ...