PED & ISO 9001:2000 certified 3.1 and 3.2 certificate oil and gas pipe flange ,galvanized pipe flange ,hydraulic pipe flange 1. ... Type: oil and gas pipe flange,galvanized pipe flange,hydraulic pipe flange 2. Material ... : carbon steel, stainless steel and alloy steel flange3. Standard: ANSI, JIS, BS, DIN, UNI, ...