... BS 1387, JIS G3463-2006, GB 5310-1995, DIN 1626, ASTM A106-2006, API 5L Grade SpecificationsSize: 1/8 to 48 inches ... Standard:GB/T8163, ASTM A53, ASTM A106, JISG3452, JISG3454, DIN1629, API5L Surface:Oiled or black paintcarbon ... 2 Standard:GB8163-1999 API 5LASTM A106/53DIN2448/24583Base Material:10#,20#,45#,16Mn, ASTM A106 Gr.B, ASTM A53 Gr.B, St 37, St 42,St ...