... .B Carbon Steel Pipe Standard:API 5L,ASTM A106/A53, Size:OD 1/4"-48", WT ... high quality SEAMLESS STEEL PIPES API 5L/ ASTM A106, GR.BStandardASTM A106/ASTM A 53 API 5L,GB/T8163-1999,DIN ... Other standard:API 5L, API SPEC5CT,ASTM A106,ASTM A 53,ASTM A210,ASTM A213,ASTM A179,ASTM A192,ASTM A252,ASTM A500, DIN 1629/2391/17172, ... 20#,35#,45#,ST35.4,ST37.4,ST52, A105,A106,A210,A179,A192,Q195,Q235,Q215 Size 1/4 ...