Material:Carbon steel, stainless steel Standard:ANSI,ASTM,DIN,JIS,BS Pressure grade:PN2.5-PN40 Punch & stamp ... Flanges, Long Welding Neck Flange and etc. according to standard ANSI, DIN, ASTM,JIS,BS.PRESSURE GRADE: Class150, Class300, Class600, Class900, Class1500 ... SCMn3, 1.7220, SCCrM3, G35CrMo4,etc.; According to specification ASTM, DIN, JIS, BS, NF,ISO etc..Technical process includes green sand ...