ISO9001-2000 CERT. Strictly material and manufature control inside precised honed antirust inside Standard; ASTM A106 GR B, ASTM A53 GR B SAE1020 SAE1045 JIS G4051 S20C JIS G4051 S45C JIS G3454 STPG370 JIS 3454 STPG42 DIN ST 45-8 DIN ST 52 Tolerate: OD +1% / -1% Thickness +12.5% / -10% Length 20mm CommoditySeamless cold drawn steel pipeStandardASTM A312, ASTM A269, ASTM A554, AISI, JIS etc. ...