ASTM A350 LF2 Class 1 Alloy Steel Weld Neck Flange Low Temperature Forged Flange
ANSI / ASME Forged Flange , ASTM A350 Grade LF2 Class 1 Alloy Steel Weld Neck Flange WNRF
The ASTM A350 LF2 flange is designed to maintain toughness and impact resistance which is suitable for low-temperature applications down to -50°F (-45°C) and also for higher temperatures. They are commonly used in oil and gas pipelines, chemical processing, and other industries where durability and resistance to low temperatures are essential.
Key Advantages of ASTM A350 LF2 Alloy Steel Weld Neck Flange
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Low-Temperature Toughness: Reliable performance in cryogenic conditions.
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High Strength: Suitable for high-pressure systems.
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Corrosion Resistance: Optional treatments or coatings for harsh environments.
Differentiation from Similar Grades:
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LF2 vs. LF1: Higher manganese and optional nickel in LF2 improve low-temperature performance.
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LF2 vs. A105: A105 is for ambient temperatures, while LF2 is specialized for low temps.
Chemical Composition of ASTM A350 LF2 Alloy Steel Weld Neck Flange
| Grade | C% | Mn% | Si% | S% | P% | Cr% | Ni% |
| LF1 | 0.30 max | 0.6/1.35 | .15/.30 | .040 max | .035 max | 0.30 max | 0.40 max |
| LF2 | 0.30 max | 0.6/1.35 | .15/.30 | .040 max | .035 max | 0.30 max | 0.40 max |
| LF3 | 0.20 max | 0.90 | .20/.35 | .040 max | .035 max | 0.30 max | 3.3/3.7 |
Mechanical Properties of ASTM A350 LF2 Alloy Steel Weld Neck Flange
| PROPERTIES | Imperial |
|---|---|
| TS Min psi (Mpa) | 70,000 (485) |
| YS Min psi (Mpa) | 36,000 (250) |
| EL (2″ Min) | 22% |
| RA Min | 30% |
| Hardness, Bhn | Max 197 |
| -50ºF Charpy | Min Impact |
| Energy F t/Lb (J):- | |
| Set of 3 Specimen* | 15 (20) |
| For One Specimen | 12 (16) |
Available Flanges Grades
| Stainless Steel | F304, F304L, F304H, F316, F316L, F316Ti, F310, F310S, F321, F321H, F317, F317L, F347, F347H, F904L |
| Duplex Steel | UNS S31803, 2205, S31254 (254SMO),UNS S32750, UNS S32760 |
| Carbon Steel | ASTM A105, A105N |
| Alloy Steel | F1, F11, F22, F5, F9, F9, F91, F92, |
| Nickel Alloy | Monel 400 & K500,
Inconel 600, 601, 617, 625, 690, 718, X-750. Incolloy 800, 800H, 800HT, 825, 925. Hastelloy C22, C4, C276, S, C2000, G-30, G-35, X, N, B, B-2, B-3 |
Common Standards and Dimensions
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Dimensional Standards: These flanges are manufactured to standard dimensions such as:
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ASME B16.5: Pipe Flanges and Flanged Fittings (NPS ½" to 24")
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ASME B16.47: Large Diameter Steel Flanges (NPS 26" to 60")
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Pressure Ratings: They are available in standard pressure classes like 150#, 300#, 600#, 900#, 1500#, and 2500#.
Applications:
- Oil and Gas Industry: For piping systems in low-temperature environments, particularly in production and transport applications.
- Chemical Processing: Suitable for applications that involve low-temperature corrosive chemicals.
- Cryogenic Applications: Used in processes involving gaseous or liquid hydrocarbons at low temperatures, such as liquefied natural gas (LNG) facilities.
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