ASTM A53/A106/API 5L For Shipbuilding Carbon Steel Pipe 1) Size:1/8'' to 24'' 2) Standard:APL 5L,API 5CT,ASTM A106 ... 52 , ST374) Standards of Steel Pipe: ASTM A106 , ASTM 53 , API 5L and etc.5) Surface of Steel Pipe oiled or ... or precision cold rolled steel tubes are available here 3Applicationuse for oil well, boilers, precision machines, petro-chemical, ship, structure pipe ...