Yuhong Group Co.,Ltd
Yuhong Holding Group Co.,LTD
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ANSI / ASME B16.5 Forged Flange ASTM A350 Grade LF2 Alloy Steel Weld Neck Flange
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
Low-Temperature Toughness: Reliable performance in cryogenic conditions.
High Strength: Suitable for high-pressure systems.
Corrosion Resistance: Optional treatments or coatings for harsh environments.
Differentiation from Similar Grades:
LF2 vs. LF1: Higher manganese and optional nickel in LF2 improve low-temperature performance.
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 |
Manufacturing and Processing:
Forging Process: Provides superior grain structure alignment, enhancing strength and fatigue resistance compared to casting.
Heat Treatment: Typically normalized or quenched and tempered to achieve desired mechanical properties and stress relief.
Applications:
