Astm A350 LF2 Flange Manufacturer
SSM has 30 years of experience in providing high-quality carbon steel forged ASTM A350 LF2 flanges, whether they are produced according to ASME, DIN, JIS, ISO, EN, or customized services.
Carbon Steel Forged ASTM A350 LF2 Flanges
The ASTM A350 LF2 flange offered by SSM conforms to the ASTM A350 standard for low-temperature carbon steel flanges.
We stock ASTM A350 LF2 flanges. The available product models include the following:
- Types: Weld Neck (WN), Slip-On (SO), Socket Weld (SW), Lap Joint (LJ), Threaded (TH), Orifice
- Size Range: 1/2 inch to 48 inches
- Pressure Class: 150# to 2500#
- Standards: ASME B16.5, ASME B16.47, and more
If you require flange products, please get in touch with us, and we can discuss how to fulfill your supply needs.
ASTM A350 LF2 Flange By Types
ASTM A350 LF2 Weld Neck Flange
ASTM A350 LF2 Weld Neck Flange is an essential solution for low-temperature service. It features a long tapered hub that is expertly welded to the pipe.
ASTM A350 LF2 Slip On Flange
The Slip-On (SO) flange offers a seamless fit over the end of the pipe, ensuring strength and leak prevention through dual inside and outside welding.
ASTM A350 LF2 Socket Weld Flange
The Socket Weld (SW) flange boasts a recessed area (socket) for easy pipe insertion, with fillet welding at the top providing a secure connection.
ASTM A350 LF2 Lap Joint Flange
The Lap Joint flange, also known as a loose flange, offers easy alignment as it slides over a butt-welded stub end, enabling swift rotation.
ASTM A350 LF2 Threaded Flange
The Threaded (TH) flange’s internal threading matches the external threading on the pipe, promoting effortless assembly without welding.
ASTM A350 LF2 Blind Flange
The blind flange—a solid disc with no bore or opening—stands as a reliable solution for fully blocking off pipelines or systems.
Advantages of ASTM A350 LF2 Flanges
Economical
Despite providing excellent performance under low temperature conditions, the cost of ASTM A350 LF2 flanges is generally more economical than that of other high-performance materials.
Excellent low-temperature toughness
ASTM A350 LF2 flanges can withstand temperatures as low as -50°F (-46°C) while retaining their mechanical properties, significantly reducing the risk of brittle fracture.
Stable mechanical properties
The chemical composition and mechanical properties of the material are strictly controlled to ensure that each flange's performance is stable and consistent, with good impact and wear resistance, and to improve its durability in harsh environments.
Good welding performance
Due to their low carbon content, ASTM A350 LF2 flanges have good welding performance, enabling high-quality welded connections and reducing welding defects. They are suitable for welding with various materials and convenient for use in different piping systems.
Carbon steel for low temperature
ASTM A350 LF2 flanges are designed to maintain good mechanical properties and toughness at low temperatures, especially at temperatures as low as -50°F (-46°C) or even lower. Their use in these applications ensures the safety and reliability of the system by preventing brittle fracture at extremely low temperatures. These flanges are suitable for various industries and applications such as oil and gas, chemicals, refrigeration, and nuclear power. If you need flange products, please contact us, and we can discuss how to meet your supply needs.
ASTM A350 LF2 Flanges Manufacturing Process
The production of ASTM A350 LF2 flanges involves a series of crucial processes to ensure that the final product meets the necessary standards and specifications for low-temperature service.
- Material Preparation: Steel is cut and shaped to meet composition requirements.
- Forging: Heated steel is forged and cooled to relieve stresses.
- Heat Treatment: Normalizing refines grain structure and toughness. Additional processes may be used.
- Machining: Forged blanks are machined to precise dimensions.
- Surface Preparation: Flanges are cleaned, smoothed, and may be coated for durability.
What makes SSM the best choice for supplying ASTM A350 LF2 flanges?
Price Advantage: We supply this material throughout the year, which gives us a significant advantage in raw material prices. Our technology is also mature. One of our advantageous products is the ASTM A350 LF2 flange.
Quality Control: We strictly control product quality in every stage of production, including raw materials, forging, heat treatment, machining, quality inspection, labeling, and packaging.
Controllable Delivery Time: Our production processes can be strictly scheduled according to the contract delivery time. In most cases, we can complete it ahead of schedule.
ASTM A350 LF2 Flanges for Different Industries
Oil and Gas Industry
Our flanges are essential for pipeline systems transporting oil, natural gas, and other liquids in low-temperature environments, such as oil fields or Arctic submarine pipelines.
Chemical Processing Industry
Ensure safety and durability in equipment for storing and handling cryogenic liquid or gas chemicals with our high-quality flanges.
Energy and Power Industry
Our ASTM A350 LF2 flanges play a crucial role in low-temperature cooling systems in power stations, including cooling water pipelines and related equipment.
Water Treatment and Transportation
SSM provides reliable wastewater and sewage treatment systems that are designed to handle low temperatures while offering secure connections and seals.
One-Stop Flange Provider for All Your Needs
SSM has significant product advantages in manufacturing ASTM A350 LF2 flanges, especially large-sized flanges. Whether it’s quality or price, we will meet your needs.
Related Products
Additional information on ASTM A350 LF2
ASTM A350 covers several grades of carbon and low alloy steel forged or ring-rolled flanges, forged fittings and valves for low-temperature service.
For more information, please see the following documents
ASTM A350 LF2 equivalent material
| Standard | Material Designation | Country/Region | Remarks |
| EN 10222-4 | P250GH, P280GH | Europe | For high and low temperature applications |
| DIN 17243 | C22.8 | Germany | Similar chemical composition and mechanical properties |
| JIS G3212 | SF440A | Japan | Suitable for low-temperature applications |
| BS 1503 | 161-430 | United Kingdom | Can be used in low-temperature conditions |
| GOST 1050 | 20, 20K | Russia | Good toughness and mechanical properties in low temperatures |
| SAE | 1020, 1021 | USA | Similar carbon content and mechanical properties |
ASTM A350 LF2 Material Properties
| Property | Specification |
| Chemical Composition | |
| – Carbon (C) | 0.20% max |
| – Manganese (Mn) | 0.60% – 0.90% |
| – Phosphorus (P) | 0.035% max |
| – Sulfur (S) | 0.035% max |
| – Silicon (Si) | 0.15% – 0.40% |
| – Additional Elements | Minor amounts of Chromium (Cr) and Molybdenum (Mo) allowed |
| Mechanical Properties | |
| – Yield Strength | Minimum 42 ksi (290 MPa) |
| – Ultimate Tensile Strength | Minimum 60 ksi (415 MPa) |
| – Elongation | Minimum 20% (in 8 inches sample) |
| – Impact Toughness | Minimum 27 ft-lb (37 J) @ -50°F (-46°C) |
| Physical Properties | |
| – Density | Approximately 7.85 g/cm³ (0.284 lb/in³) |
| – Hardness | Typically 130 – 170 HB (Brinell hardness) |
| Temperature Range | |
| – Service Temperature | Designed for use down to -50°F (-46°C), and sometimes lower |
| Heat Treatment | |
| – Normalizing | Generally performed to achieve desired mechanical properties |
| – Quenching and Tempering | May be used to further enhance mechanical properties and toughness |
| Testing and Quality Assurance | |
| – Testing | Includes chemical analysis, mechanical testing (tensile and impact tests) |
| – Certification | Products are usually supplied with a test certificate confirming compliance with ASTM A350 LF2 standards |
ASTM A350 LF2 class 1 vs class 2
- Class 1 flanges are normalized or normalized and tempered, providing superior toughness and impact resistance at very low temperatures. They are suitable for extreme low-temperature environments.
- Class 2 flanges are tempered and are used in environments with less severe temperature requirements. They offer adequate toughness but are not as resilient as Class 1 flanges in extreme cold conditions.
Here’s the comparison between ASTM A350 LF2 Class 1 and Class 2 flanges in a tabular format:
| Aspect | Class 1 | Class 2 |
| Heat Treatment | Normalization or Normalizing + Tempering | Tempering (Normalization not required) |
| Impact Test Temperature | -50°F (-45°C) | 0°F (-18°C) |
| Mechanical Properties | Higher toughness and better low-temperature impact resistance | Lower toughness compared to Class 1 |
| Application | Used in severe low-temperature environments (e.g., Arctic oil and gas, LNG facilities) | Suitable for less stringent low-temperature environments |
| Key Characteristics | Required to withstand extremely low temperatures and provide high impact toughness | Suitable for moderately low temperatures with adequate toughness |
What is the difference between ASTM A105 and ASTM A350 LF2?
ASTM A105 is suitable for ambient and higher temperatures, while ASTM A350 LF2 is designed for cryogenic applications. The chemical composition of A350 LF2 includes additional alloys, such as nickel, which enhances its low-temperature toughness. Impact testing is required during the inspection, which is unnecessary for A105 materials.
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