http://www.hkflanges.com/plate-flanges/carbon-steel-plate-flanges/ Plate flange standard system Nominal pressure: 0.25Mpa~42.0Mpa a. Series 1: PN1.0, PN1.6, PN2.0, PN5.0, PN10.0, PN15.0, PN25.0, PN42 (main series) b. Series 2: PN0.25, PN0.6, PN2.5, PN4.0 Among them, PN0.25, PN0.6, PN1.0, PN1.6, PN2.5, PN4.0 have a total of 6 grades of flange sizes belonging to the European flange system represented by German flanges, and the rest are American laws The American flange system represented by Lan. Shanxi Haokun flanges specializes in the production of GOST carbon steel plate flanges: carbon steel(CS) GOST 33259 PN1 carbon steel(CS) GOST 33259 PN2.5 carbon steel(CS) GOST 33259 PN6 carbon steel(CS) GOST 33259 PN10 carbon steel(CS) GOST 33259 PN16 carbon steel(CS) GOST 33259 PN25Carbon Steel Plate Flanges quotation website:http://www.hkflanges.com/plate-flanges/carbon-steel-plate-flanges/