ASTM A350 LF6 CL 2 Weld Neck Flange,Blind Flange ASME B16.5
We are a professional manufacturer of ASTM A350 LF6 CL2 Weld neck Flanges in China.
Manufactured to meet the ASTM A350/A350M specification, LF6 flanges are forged from low-alloy carbon steel and are normalized and tempered to ensure exceptional mechanical strength, notch toughness, and corrosion resistance even at temperatures as low as –51°C
ASTM A350 LF6 flanges are engineered for superior performance in low temperature environments, making them ideal for cryogenic applications, LNG processing, and petrochemical facilities.
There are 3 classed under ASTM A350 LF6,
ASTM A350 LF6 CL1,CL2 & CL3,They have the same compostion.the main differences are in mechanical properties.
Chemical Composition of ASTM A350 LF6
Comparing with Grade LF2 .LF6 has more strict element restriction,so as to guarantee its higher performance.
| Element | Composition |
|---|---|
| Carbon, max | 0.22 |
| Manganese | 1.15–1.50 |
| Phosphorus, max | 0.025 |
| Sulfur, max | 0.025 |
| Silicon [Note A] | 0.15–0.30 |
| Nickel | 0.40 max [Note B] |
| Chromium | 0.30 max [Note B,C] |
| Molybdenum | 0.12 max [Note B,C] |
| Copper | 0.40 max [Note B] |
| Columbium | 0.02 max |
| Vanadium | 0.04–0.11 |
| Nitrogen | 0.01–0.030 |
Mechanical property of ASTM A350 LF6 Flanges
LF6 has much higher Yield strength than LF2.
| Tensile & Hardness | Properties Class 1 |
Properties Class 2 & 3 |
|---|---|---|
| Tensile Strength MPa [ksi] |
455-630 [66-91] |
515-690 [75-100] |
| Yield Strength min. MPa [ksi] |
360 [52] | 415 [60] |
| Elongation in 2″, min. % |
30 | 28 |
| Reduction of Area min. % |
40 | 40 |
| Hardness max. HBW |
197 | 197 |
Charpy V-Notch Energy Requirements(Impact Test)
Specifiction of ASTM A350 LF6 Flanges
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✔ Available in: Weld Neck, Blind, Slip-On, Socket Weld, and Threaded Flanges
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✔ Sizes: ½” to 60”, Pressure Ratings: 150# to 2500#
- ✔ Face Types: Raised Face (RF), Ring Type Joint (RTJ), Flat Face (FF)
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ASTM A350 LF6 Class 1& 2&3
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ASME B16.5 / B16.47 Dimensions
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NACE MR0175 (optional)
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EN 10204 3.1 / 3.2 Certification Available
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Applications of ASTM A350 LF6 Flanges
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LNG & Cryogenic Pipelines
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Oil & Gas Refineries
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Offshore Platforms
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Petrochemical Plants
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Low-Temperature Pressure Systems
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