... Standard: GB5310-2008 , GB6479-2000 , GB9948-2006 , DIN17175-79 , ASTM SA335 , ASTM SA213 , JISG3467-88 , JISG3458-88 2 Material: 10#,20#,35 ... and southeast Asia, Australia, Africa ,16 Certificates:API , ISO9001:2000 ASTM SA335 Alloy steel pipe