... International standard and ISO 9001 2.Factory test prove 3.To Bolivia,Indonesia,Russia,South America,ect N80 API oil casing ... diameter10.3-1219.2mmLength6000-12000mmStandardAISI, ASTM, BS, DIN, GB, JISMaterialA25,A,B,X42,X46,X52,X56,X60,X65,X70,X80 H40 ... . I will reply you soon and wish to establish a good business relationship with you. Another products you will interest from our factory ...