... >product: semless steel special pipe 2>standard :ASTM DIN BS API etc. 3>materials :J55, K55 ,N80,P110,L80 etc ... B x42, x46, x52, x56/x65, x70, and more Standards API 5L, API 5CT, ASTM A106, ANSI, ISO9001, DIN17175, EN, JISCertificate ... , Africa, etcApplications widely used in many ways, general service, fluid, gas transport, structure, machining, oil, gas service, chemical, and fertiler, etc.