... size 2. F316, F51,35CrMo, 36CrNiMo4 and so on 3. Heat treatment 4. detailed record cards of process 1 ... 48"5. Type:Slip-on flanges, Blind flanges, Lap joint flanges, Welding neck flanges, Spectacle flanges,TG flanges,Socket welding flanges and Threaded flanges,Square flanges.6. Pressure ratings ... ,RF, LJ, FM ,RTJ,RJ ,MALE ,FEMALE and so on .8. Used for : petroleum,chemical,power,gas,water,linepipe, ...