Seamless steel pipe 1.Standard:ASTM A106,A53,API 5L etc ... 100" 3.Mill Test Certificate:EN10204/3.1B Seamless steel pipe,seamless steel tube,seamless pipe1) Standard: ASTM A106, A53, API 5L, DIN2440 ... .1B 3) Third party inspection: SGS, BV, Lloyds etc. Carbon seamless Steel Pipe