... GB/T8162 , GB/T8163 ,ASTM A53 ,ASTM A106 ,DIN1629 , API 5L Steel Grade GB/T8162 , GB/T8163:10#, 20#, 35 ... 24"SCH20,30,40,60,STD XS,80ASTM A106/API 5L GR.B5.8m,6m,ASTM A53Gr.B5m to 12m ... ,X46,X52,X56/X65,X70 and more. Certificate:API spac 5L/5CT,ISO9001:2000 Process method:hot rolling or cold drawn ... :2.11mm -59.94mm Length:5-12m,customized Standards:API 5L,API5CT,ASTM A106,ANSI,ISO9001,DIN,EN,JIS. ...