... :DN15-6000 Specification:1.Name:carbon steel flange,stainless steel flanges 2.Material: carbon steel : Astm a105,a234,q235,etc. stainless steel :astm a182,304l,304 ... ai mss4.Surface:Rusproof oil, black, yellow, galavanized 5.Type: Plate ,threaded,slip-on, socet welding ,blind,welding neck, etc6.Size ...