... -1/2'--20' 2.Grade:B, X42 up to X70; L245, L290 up to L485 3.Standard:API SpecAPI ... GB/T 9711.22. Grade: B, X42 up to X70; L245, L290 up to L485 Standard:API 5L PSL1/2 ... , ISO or client optionSteel Grade:B, X42 up to X70; L245, L290 up to L485Usage:Used for the conveyance ... -A106,ASTM-A53,SY5037-2000,GB/T5711.1-1997MaterialX42,X52,X60,X65,X70,Q235,Q345,10#,20#,45#,12CrMo,15CrMo,SS304,SS321packagingPainting ...