A350 LF2 Weld Neck Flange is a kind of pipe fittings, which refers to a flange with a neck and a round pipe transition and is butt welded to the pipe. Weld neck flange is not easy to deform, has good sealing, and is widely used. It is suitable for pipelines with large fluctuations in pressure or temperature or high-temperature, high-pressure and low-temperature pipelines.
A350 is a standard of the American Society for Testing and Materials (ASTM). The materials in A350 are used to manufacture low-temperature pressure parts, such as weld neck flanges, etc. These materials have good low-temperature toughness and other properties.In the petrochemical industry, A350 LF2 weld neck flanges are widely used in pipeline systems for transporting media such as crude oil and natural gas.
Specification of A350 LF2 Flange
Shape Type | Regular and Long Neck |
Sealing Face | RF, FF, FTJ |
Size Range | 1/2″ – 48″/ DN15 – DN1200 |
Pressure Rating | Class 150, 300, 600, 900, 1500, 2500lb |
Standard | ASME B16.5, ASME B16.47 Series A/B |
Low Temp Carbon Steel | ASTM A350 LF2/LF3 |
ASTM A350 LF2 Weld Neck Flange Chemical Composition
CHEMICAL | LIMITS | C | Mn | P | S | Si | Cu | Ni | Cr | Mo | V | Nb |
ASTM A350 LF2 | MIN | 0.60 | 0.15 | |||||||||
MAX | 0.30 | 1.35 | 0.035 | 0.040 | 0.35 | 0.40 | 0.40 | 0.30 | 0.12 | 0.08 | 0.02 |
ASTM A350 LF2 Weld Neck Flange Mechanical Property
MATERIAL | T.S (MPA) | Y.S (MPA) | EL % | R/A % | HARDNESS |
ASTM A350 LF2 | 485-655 | 250 min | 22 min | 30 min | 197 max |
Class 150 lb Weld Neck Flange Dimensions