... structure, mechanical structure with seamless steel tubes. Standard GB/T8162 , GB/T8163 ,ASTM A53 ,ASTM A106 ,DIN1629 , API 5L Steel Grade GB/T8162 , GB/ ... T8163:10#, 20#, 35#, 45#, 16MN(Q345B) ASTM A53 GR. A ... .0 API 5L A B X42,X46, X52, X60, X65, X70, X80 ASTM A106 GrB seamless steel pipe China GBASTMDIN 17175 10#ASTM A106 ...