... ) Standard: ASTM, ANSI, JIS,DIN,GB, BS, NF, etc.4) Material: Stainless steel such as ASTM A734/734M,ASTM A351M,ASTM ... .Martensitic stainless steel such as JIS G5121, DIN 17445, etc.Gray iron such as ANSI/ASTM A48 ,BS 1452, NF A32-101 ... , DIN 1691,JIS G5501, ect.Ductile iron such as ANSI/ASTM A536 ,BS 2789, DIN 1963, NF ...