ASTM A350 LF2 is a low-temperature carbon steel grade that is commonly used in various industrial applications where impact toughness and resistance to low temperatures are crucial. The "LF" in LF2 stands for "Low Ferrite," indicating its improved toughness at low temperatures. This grade is particularly suitable for applications in industries such as oil and gas, petrochemical, and power generation, where exposure to sub-zero temperatures is common.
One of the primary forms in which ASTM A350 LF2 is available is in the form of bars. These bars are manufactured through processes such as hot rolling or forging, ensuring that the material meets the required mechanical and chemical properties. Here are some key aspects to consider when it comes to ASTM A350 LF2 bars:
Heat Treatmen of ASTM A350 Carbon Steel LF2 Bars t:
ASTM A350 LF2 bars are often subjected to heat treatment processes to enhance their mechanical properties. Normalizing or quenching and tempering are common heat treatment methods used to achieve the desired combination of hardness and toughness.
Weldability:
ASTM A350 LF2 is known for its good weldability. Welding processes such as shielded metal arc welding (SMAW), gas tungsten arc welding (GTAW), and gas metal arc welding (GMAW) can be employed for joining LF2 bars without compromising the material's properties.
Corrosion Resistance:
AThe alloying elements in LF2 contribute to its corrosion resistance, making it suitable for use in environments where exposure to corrosive substances is a concern. Proper corrosion protection measures should still be considered depending on the specific application.
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Specifications | ASTM A350, ASME SA350 |
Dimension Standard | EN, DIN, JIS, ASTM, BS, ASME, AISI |
Bar Diameter | 3 ~ 800mm |
Hex Bar size | 2-100mm A/F |
Flat bar size | Thickness: 2 -100mm. Width: 10 to 500mm. |
Square bar size | 4 to 100mm |
Rectangular Bars | Size: 33 x 30mm to 295 x 1066mm. Thickness: 3.0 to 12.0mm. |
Hollow Bars | 32mm OD x 16mm ID to 250mm OD x 200mm ID) |
Billet Size | 1/2 to 495mm Diameter |
Finish | Cold (bright) drawn, centreless ground, hot rolled, smooth turned, peeled, slit rolled edge, hot rolled annealed, Rough Turned, Bright, Polish, Grinding, Centreless Ground & Black |
Tolerance | H8, H9, H10, H11, H12, H13K9, K10, K11, K12 or as per clients requirements |
Bar Surface | Bright, Hot Rolled Pickled, Cold Drawn, Sand Blasting Finished, Polished, Hairline |
Rolled Bars Condition | Hardened & tempered, annealed |
Cold Rolled Bar Technique | Hot Rolled, Cold Drawn, Cold Rolled, Forged Round Bar, Rod |
Form | Round, Rod, T-Bar, Channel Bar, Precision Ground Bar, Flat Bar, Square, Blocks, Round Rod, Rings, Hollow, Triangle, Rectangle, Hex (A/F), Threaded, Half Round Bar, Profiles, Billet, Ingot, I/H Bar, Forging etc. |
Melting
The first step in the process is melting raw materials in an electric furnace. These raw materials are typically iron ore, chromium, nickel, and other elements in exact amounts.
Hot Rolling
After being heated, the billets are shaped into long, thin rods by going through a series of rolling mills. Because the metal is heated above its recrystallization temperature during this operation, it is known as hot rolling.
Pickling
The pickling process is used to the bars in order to eliminate any oxide, scale, or other surface contaminants. Usually, an acid solution is used for this.
Cutting
Lastly, shearing machines or other cutting techniques are used to cut the rods to the required length.
STANDARD | UNS | WERKSTOFF NR |
ASTM A350 LF2 | K03011 | 1.0508 |
ASTM A350 LF2 has a specified chemical composition that includes elements such as carbon, manganese, phosphorus, sulfur, silicon, nickel, chromium, molybdenum, and copper. The chemical composition is designed to provide the required combination of strength, toughness, and corrosion resistance.
Grade | C | Mn | Si | P | S | Cr | Mo |
ASTM A350 | 0.30 max | 0.60 - 1.35 max | 0.15 - 0.30 max | 0.035 max | 0.040 max | 0.30 max | 0.12 max |
The mechanical properties of LF2 bars are critical for ensuring their performance in various applications. The material exhibits excellent impact toughness at low temperatures, making it suitable for cryogenic services. The bars typically undergo testing for properties such as tensile strength, yield strength, elongation, and reduction of area.
Grade | Tensile Strength (Ksi) | Elongation | Yield Strength(Ksi) |
Carbon Steel ASTM A350 | 70–95 | 22% min | 36 |
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LF2 bars find applications in a wide range of industries. In the oil and gas sector, they are used for components such as flanges, valves, and fittings. Additionally, these bars are employed in power generation plants, chemical processing industries, and other applications where low-temperature performance is crucial.
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