ASME/ASTM A350 LF2 FLANGE

ASTM A350 LF2 is a specification for carbon and low-alloy steel forgings that are used in low-temperature service. This material specification is particularly relevant for flanges and other components used in environments where temperatures can drop significantly. Here's an overview of ASTM A350 LF2 flanges:ASTM A350 LF2 Flange Overview1. Material Specifications:• Chemical Composition:o Carbon: 0.26-0.34%o Manganese: 0.60-0.90%o Phosphorus: 0.035% maxo Sulfur: 0.040% maxo Silicon: 0.15-0.35%o Nickel: 0.40% maxo Chromium: 0.30% maxo Copper: 0.20% max• Mechanical Properties:o Yield Strength: 42,000 psi (290 MPa) min at low temperatureso Tensile Strength: 60,000-80,000 psi (415-550 MPa)o Elongation: 20% min in 8 inches (200 mm)o Impact Toughness: The material is tested for impact toughness at low temperatures to ensure it remains ductile and tough under these conditions.2. Flange Types:ASTM A350 LF2 flanges can be manufactured in various types to suit different applications:• Weld Neck Flanges: Provide a strong, high-integrity connection suitable for high-stress applications and are well-suited for low-temperature environments.• Slip-On Flanges: Fit over the pipe and are then welded in place. Used in lower-pressure applications.• Blind Flanges: Used to close the end of a pipeline or vessel, preventing flow.• Socket Weld Flanges: Used for small-diameter pipes and provide a strong weld connection.• Threaded Flanges: Generally avoided in very low-temperature applications due to potential brittleness.3. Dimensions and Tolerances:• Dimensions: Adhere to standards such as ANSI B16.5 (for standard pipe flanges) or ANSI B16.47 (for large diameter flanges), including details such as:o Bolt Circle Diametero Number and Size of Bolt Holeso Flange Thickness• Tolerances: Ensure precise fitting and alignment. The standard provides allowable deviations in dimensions to ensure proper sealing and strength.4. Pressure Classes:ASTM A350 LF2 flanges are available in various pressure classes, which are detailed in the following standards:• Class 150• Class 300• Class 600• Class 900• Class 1500• Class 2500o 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: LTCS: ASTM/ASME A350 LF2, ASME/ASTM A694 F42, F46, F52, F60, F65, F70