... "-48" Material:Q235 A105 A304 STD SCH20-SCH160 steel forged BLIND flange1). Type: WN Flange, SO Flange, RTJ Flange, BL Flange ... used in Petroleum, Chemical industry, Machinery, Electric power and so on pipe joint. 6). Special design available As a professional manufacturer ... interested in, pls don't hesitate to contact steel forged BLIND flange