Yuhong Group Co.,Ltd
| Cryogenic Certification | Charpy V-Notch Impact Test |
| Flange Face Type | RF (Raised Face), RTJ (Ring Type Joint) |
| Size Range | 1/2'' to 24'' |
| Class | 150#-2500# |
| Connection Type | Forged |
| Delivery Time | Depend on quantity |
| Specification&Material | ASME SA350 LF2 CL1 |
| Application | Oil & gas, Petrochemical, LNG-adjacent utilities, Cold-region pipeline stations |
| Supply Ability | According to Clients' requirements |
| Payment Terms | L/C,T/T |
| Product Name | Forged Body Flange |
| Packaging Details | Ply-wooden Case /Iron Case/ Bundle with plastic Cap |
| Certification | ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2015 |
| Place of Origin | China |
| Brand Name | YUHONG |
| Model Number | ASME SA350 LF2 CL.1 |
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Product Specification
| Cryogenic Certification | Charpy V-Notch Impact Test | Flange Face Type | RF (Raised Face), RTJ (Ring Type Joint) |
| Size Range | 1/2'' to 24'' | Class | 150#-2500# |
| Connection Type | Forged | Delivery Time | Depend on quantity |
| Specification&Material | ASME SA350 LF2 CL1 | Application | Oil & gas, Petrochemical, LNG-adjacent utilities, Cold-region pipeline stations |
| Supply Ability | According to Clients' requirements | Payment Terms | L/C,T/T |
| Product Name | Forged Body Flange | Packaging Details | Ply-wooden Case /Iron Case/ Bundle with plastic Cap |
| Certification | ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2015 | Place of Origin | China |
| Brand Name | YUHONG | Model Number | ASME SA350 LF2 CL.1 |
| High Light | ASME SA350 LF2 forged steel flange ，low temperature carbon steel flange ，SA350 LF2 Class 1 flange | ||
ASME SA350 LF2 CL.1 Carbon and Low-Alloy Steel Forged Body Flange for Low Temperature
ASTM A350 (ASME SA350) applies to carbon and low-alloy steel forged or ring-rolled piping components intended primarily for low-temperature service, with mandatory notch toughness testing. Within this family, A350 LF2 is the most common LTCS grade used across oil & gas, petrochemical, LNG-adjacent utilities, and cold-region pipeline stations.
ASME SA350 LF2 CL1 flange is formed by integral forging, where the body (including sealing face, neck, bolt holes, etc.) is machined from a single forged billet without welded seams. It meets the standard’s requirements for chemical composition, mechanical properties (such as tensile strength, yield strength, elongation), and Charpy V-notch impact energy at -46°C. This flange is suitable for valves, equipment connections, and pressure vessel nozzles in petrochemical, natural gas, marine engineering, and low-temperature piping systems, ensuring safe and reliable operation under cryogenic conditions.
| Item | ASME SA350 LF2 Class 1 | ASME SA350 LF2 Class 2 |
| Minimum Service Temperature | -46°C | -18°C |
| Impact Test Temperature | -46°C | -18°C |
| Minimum Average Impact Energy | 20 Joules (approx. 15 ft-lbs) | 27 Joules (approx. 20 ft-lbs) |
| Typical Applications | Extremely low‑temperature environments (e.g., LNG transportation, arctic pipeline systems) | General low‑temperature environments (e.g., certain chemical equipment, less severe low‑temperature pipelines) |
Chemical & Mechanical Properties
|
ASME SA350 LF2 CL.1 Chemical Properties (%) |
||||||||||
|
C |
Cr | Mn |
Si |
P | S | Ni | Nb | Mo | Cu | V |
| ≤0.03 | ≤0.30 | 0.60-1.35 | 0.15-0.30 | ≤0.035 | ≤0.040 | ≤0.40 | ≤0.02 | 0.12 | ≤0.40 | ≤0.08 |
Mechanical Properties
| Tensile Strength |
Yield Strength (0.2% offset) |
Elongation % |
||
| in 4D gauge length |
in 2 in. or 50 mm wall thickness ≥ 5⁄16 in. [7 .94 mm] |
in 2 in. or 50 mm wall thickness＜ 5⁄16 in. [7 .94 mm] |
||
| 485-655 MPa | ≥ 250 MPa | ≥ 22 | ≥30 | 48t+15 |
Key Adventages
Specifications of ASTM A350 Body Flange
| Material | Grade LF2, LF1, LF3, LF5, LF6, LF9, LF787, Class 1, 2, 3 |
| Flange Face Type | RF (Raised Face), RTJ (Ring Type Joint) |
| Size | 1/2'' to 24'' in ASME B16.5, up to 60'' in ASME B16.47 |
| Pressure | Class 150, 300, 600, 900, 1500, 2500 |
| Manufacturing Standards | ASME B16.5, ASME B16.47 A, B |
Testing
| *LF2 CL1 Charpy V-Notch Impact Test (For Standard Size [10 by 10 mm] Specimens) | ||
|
Charpy V-Notch Energy Requirements |
Minimum Impact Energy Required for Average of Each Set of Three Specimens ft·lbf [J] |
15 [20] |
|
Minimum Impact Energy Permitted for One Specimen only of a Set ft·lbf [J] |
12 [16] | |
|
Standard Impact Test Temperature ℉[℃] |
−50 [−46] | |
|
Maximum Supplemental Test Temperatures ℉[℃] |
−35 [−37] |
|
|
Maximum Carbon Equivalent Value |
Max. Thickness Less Than or Equal to 2 in. |
0.47 |
|
Max. Thickness Greater Than 2 in. |
0.48 |
|
Company Details
Business Type:
Manufacturer,Distributor/Wholesaler,Importer,Exporter,Trading Company,Seller,Other
Year Established:
2007
Total Annual:
50M-70M
Employee Number:
50~850
Ecer Certification：
Verified Supplier
Yuhong Group is one of the large scale group company in China, more than 35 years experience in the international market, providing high-quality services to over 3000 customers, end user which like Aramco, Petrobras, Pemex, Petronas, Ecopetro, Petroecuador, …. till now Yuhong Grou... Yuhong Group is one of the large scale group company in China, more than 35 years experience in the international market, providing high-quality services to over 3000 customers, end user which like Aramco, Petrobras, Pemex, Petronas, Ecopetro, Petroecuador, …. till now Yuhong Grou...
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