... grade:Carbon steel:Chinese Standard:20#,25#,35#,45#,50#,60#;Japan Standard:S20C,S25C,S35C,S45C,S55C,S60C;US Standard ... 25CrMo4,34CrNiMo6,39CrNiMo3,17NiCrMo6,18CrNiMo7-6,S355J2G3,ASTM A105,ST52-3,16MnCr5,20MnCr5,16MnCrS5,20MnCrS5,21CrMoV511,56NiCrMoV7,18NiCrMo5,30CrNiMo8,34NiCrMo16, ... if needed;Ultrasonic Test:According GB/T6401-91 Class 1,Class 2,Class 3; And GB/T6402-2008 Class 3,Class 2; And Sep1921 ...