Carbon steel (CS) flange specifications depend on material grades, dimensional standards, and pressure ratings. Common material standards include ASTM A105N for high-temperature forgings, ASTM A350 LF2 for low-temperature service, and ASME B16.5 or ASME B16.47 for dimensions spanning pressure classes 150 to 2500. Key Material Specifications • ASTM A105 / A105N: Standard for forged carbon steel piping components for ambient and higher-temperature services. • ASTM A350 LF2: Low-temperature carbon steel grade requiring sub-zero impact testing. • ASTM A694: High-strength forged carbon and alloy steel components for high-pressure transmission service (Grades F42 through F70). Dimensional & Design Standards • ASME B16.5: Covers pipe flanges and flanged fittings from NPS 1/2 to NPS 24. • ASME B16.47: Covers large-diameter steel flanges from NPS 26 to NPS 60 (Series A and B). • MSS SP-44: Standard for steel pipeline flanges. Types and Pressure Classes • Flange Types: Weld Neck, Slip-On, Blind, Socket Weld, Threaded, Lap Joint, and Ring Type Joint (RTJ). • Pressure Ratings: Class 150, 300, 400, 600, 900, 1500, and 2500. • Facing Types: Raised Face (RF), Flat Face (FF), and Ring Type Joint (RTJ). If you're working on a specific procurement or design, let me know:What is the pipe size (NPS) and pressure class?What are the temperature and fluid conditions?I can help you pinpoint the exact material grade and flange type you need.