1.carbon and alloy steel pipe flanges 2.Material of Q235 , A105 , WP1 , WP9 ... WN , SO, BL , SW , LJ and TH pipe flanges of carbon and alloy steelmaterial of a106 , q235 , wp1, wp9 , st45 ... accoring to GB , ASTM , DIN standardsize: DN15--DN600type: WN , SO , BL , SW , LJ ... , L/Ccontact person : Ms. Haphry Wu ; mobile:0086-13963583000 carbon steel flange