ASTM A53/A106/API 5L Carbon Steel Seamless Pipe 1.Standard:ASTM,API,DIN 2.Grade: 10#-45#, 16Mn, A53-A369, API J55-API ... ST374) Standards of Steel Pipe: ASTM A106 , ASTM 53 , API 5L and etc.5) Surface of Steel Pipe oiled or black painted ... TYPESeamless steel pipe (hot finished steel tube )StandardDIN17175,DIN1626,DIN2448,DIN17120,API 5L, API 5CT, ASTM A106, ASTM A53,ASTM A179,ASTM A210,ASTM A36, ...