ALLOY STEEL FLANGE

Alloy steel flanges are used in high-pressure, high-temperature, and corrosive environments where carbon steel may not be sufficient. Alloy steels are specifically engineered with alloying elements such as chromium, molybdenum, and nickel to enhance properties like strength, hardness, and resistance to wear and corrosion.Full Specifications for Alloy Steel Flanges1. Material Specifications:Alloy steel flanges are made from various grades of alloy steel, each designed for specific conditions. Some common alloy steel grades used for flanges include:• ASTM A182 F1, F5, F9, F11, F22, F91:o F1: Low alloy steel, often used in high-temperature applications.o F5: Contains chromium and molybdenum for high-temperature strength.o F9: Chromium-molybdenum steel, used for high-pressure and high-temperature applications.o F11: Chromium-molybdenum steel, suitable for high-temperature service.o F22: Chromium-molybdenum steel with higher hardness and strength.o F91: High-chromium-molybdenum steel for extremely high temperatures and pressures.Chemical Composition Examples (ASTM A182 F11):• Carbon: 0.05-0.15%• Manganese: 0.30-0.60%• Chromium: 1.00-1.50%• Molybdenum: 0.44-0.65%• Silicon: 0.15-0.35%2. Types of Alloy Steel Flanges:• Weld Neck Flanges:o Description: Welded to the pipe and designed to handle high stress and temperatures.o Applications: Used in high-pressure and high-temperature services.• Slip-On Flanges:o Description: Slips over the pipe and is welded in place.o Applications: Suitable for moderate pressure and temperature applications.• Blind Flanges:o Description: Used to seal the end of a pipe or vessel.o Applications: Often used for pipeline termination or to provide access to the interior.• Socket Weld Flanges:o Description: Pipe is inserted into the flange socket and then welded.o Applications: Ideal for small-diameter pipes and high-pressure services.• Threaded Flanges:o Description: Have internal threads that fit over the pipe’s external threads.o Applications: Used where welding is not practical, though less common in high-temperature services.3. Dimensions and Tolerances:• Dimensions: Follow standards such as ANSI B16.5 (for sizes up to 24 inches) and ANSI B16.47 (for larger sizes). Key dimensions include:o Nominal Pipe Size (NPS): From 1/2 inch to 60 inches.o Pressure Classes: 150, 300, 600, 900, 1500, and 2500.o Bolt Circle Diameter: Diameter of the circle on which bolt holes are spaced.o Number of Bolt Holes: Typically 4, 8, or 12, depending on the flange size and pressure class.o Bolt Hole Diameter: Size of the holes for bolts.o 2. SPECFICATIONS:• Manufacturing Range: DN 15 (1/2”) to DN 1500 (60”)• Rating/Class: 150/300/600/900/1500/2500 & PN 10/16/25/40/63/100 etc.• Dimension Standard: ANSI/ASME B16.5/B16.47/B16.36/B16.48/DIN/EN 1092-1, etc.• Face Finish: Raised Face (RF) Finish, Flat Face (FF) Finish, Ring Type Joint (RTJ) Finish• Material Type: CARBON/ALLOY STEEL: ASTM/ASME A105/105N, ASTM / ASME A182, ASTM / ASME A335 GR F1, F5, F9, F11, F12, F22, F23, F91