Carbon steel (CS) flange specifications are defined by material grades, dimensional standards, pressure classes, and facing types. Common material grades include ASTM A105 (high-temperature forged carbon steel), ASTM A350 LF2 (low-temperature service), and ASTM A694 (high-pressure transmission). Dimensions typically follow ASME B16.5 for sizes up to 24 inches and ASME B16.47 for sizes 30 inches and larger. Material Grades • ASTM A105 / A105N: Standard for forged carbon steel piping components for ambient and higher-temperature service. • ASTM A350 LF2: Low-temperature carbon steel requiring Charpy V-notch impact testing. • ASTM A694 (F42–F70): High-strength carbon steel for oil and gas transmission pipelines. Dimensional Standards • ASME B16.5: Pipe flanges and flanged fittings from NPS 1/2 to NPS 24. • ASME B16.47: Large diameter steel flanges from NPS 26 to NPS 60 (Series A and B). • BS 10 / EN 1092 / DIN: Alternative international and European standards. Pressure Ratings & Classes • ASME Classes: 150, 300, 400, 600, 900, 1500, and 2500. • PN Ratings (Metric): PN 6, PN 10, PN 16, PN 25, PN 40, up to PN 100. Flange Types & Facings • Types: Weld Neck, Slip-On, Blind, Socket Weld, Threaded, Lap Joint. • Facings: Raised Face (RF), Flat Face (FF), and Ring Type Joint (RTJ). If you need specific details, please share:The nominal pipe size (NPS) and pressure classThe operating temperature or fluid service typeI can help identify the exact dimensions or material requirements for your application. AI responses may include mistakes.