... and better service for customers to provide satisfactory products. Seamless steel pipe Seamless steel pipe for liquid transport :Applicable to transport liquid, ... , mechanical structure with seamless steel tubes. Standard GB/T8162 , GB/T8163 ,ASTM A53 ,ASTM A106 ,DIN1629 , API 5L Steel Grade GB/T8162 , ... ,K55,N80,P110,L80/Gr.B X42,X46,X52,X56/X65,X70 and more. Certificate:API spac 5L/5CT,ISO9001:2000 ...