a182 gr f9 alloy steel flanges generally conform to ASTM grade A182. ASTM Class A182 is a specification for rolled or forged alloy flanges for high pressure applications and systems. In addition to good corrosion resistance, the addition of chromium and molybdenum to the alloy enhances its ductility. astm a182 grade f9 is a very versatile device. Therefore, it can be used in many industries such as pharmaceutical equipment, pharmaceuticals, chemical equipment, seawater equipment, heat exchangers, condensers, pulp and paper industry, power generation, offshore oil drilling companies, natural gas processing, petrochemical and specialty chemicals. Alloy steel f9 flange manufacturers produce three flange faces, namely Raised Face (RF), Ring Joint (RTJ) and Flat Face (FF).