... welded steel pipe O.D.:15-630mm W.T:0.5-14mm Length:5.8m to 12m Standard: GB, ... API, ASTM, BS, JIS Applicable : API 5L, API welded steel pipe ProductStandardODWTLengthWelded pipeGB ... in both oil and gas industries. chemical fertilizer pipe/ natural gas/ petroleum transportation,etc.MarketNorth/South ... 1. material:Q195,Q215,Q235,Q345,16Mn2. standard:GB/T3091-2001,BS1387-1985,ASTM A53, ...