ASTM A53/A106/API 5L Carbon Steel Seamless Pipe 1.Standard:ASTM,API,DIN 2.Grade: 10#-45#, 16Mn, A53-A369, API J55-API CARBON STEEL ... B , 20# , Q235 , ST 52 , ST374) Standards of Steel Pipe: ASTM A106 , ASTM 53 , API 5L and etc.5) Surface of Steel ... painted to prevent rust . TYPESeamless steel pipe (hot finished steel tube )StandardDIN17175,DIN1626,DIN2448,DIN17120,API 5L, API 5CT, ASTM A106, ASTM A53 ...