Stainless steel 304 flanges (18Cr-8Ni) can be made from forgings, castings or sheets, respectively. It includes ASTM A182 Gr. F304 Forging, ASTM A351 Gr. CF8 casting and ASTM A240 Gr. 304 board. Flange dimensions generally conform to ASME B16.5. Available in 7 levels: 150, 300, 400, 600, 900, 1500 and 2500. The working pressures at which SS 304 flanges can be used at elevated temperatures are listed in the table below (also known as “Pressure-Temperature Rating” for the material).