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What the S355J2 material?

S355J2 is a low carbon, high tensile strength structural steel that is commonly used in construction and engineering applications. It is a non-alloy steel and falls under the European standard EN 10025-2. The “S” in S355J2 stands for structural steel, while the number “355” indicates its minimum yield strength of 355 N/mm². The letter “J” indicates the impact strength of 27 Joules at -20°C, while the number “2” indicates that it is a low carbon, high tensile strength steel.

S355J2 is widely used in the construction of buildings, bridges, and other structures due to its high strength and excellent weldability. It is also used in the manufacturing of heavy machinery, offshore structures, and wind towers. S355J2 is available in many forms, including plates, sheets, bars, and tubes. Its properties make it a versatile material for a wide range of applications.

The chemical composition of S355J2 steel is as follows:

– Carbon (C): 0.20%
– Silicon (Si): 0.55%
– Manganese (Mn): 1.60%
– Phosphorus (P): 0.025%
– Sulfur (S): 0.025%
– Nitrogen (N): 0.014%
– Chromium (Cr): 0.30%
– Copper (Cu): 0.55%
– Nickel (Ni): 0.55%
– Molybdenum (Mo): 0.10%

Note that the exact chemical composition of S355J2 can vary slightly depending on the production method and the manufacturer. However, the values listed above are typical for this grade of steel.

the mechanical properties required for flanges made from S355J2 steel will depend on the specific application and the relevant standards and guidelines. However, some of the common mechanical properties that are important for flanges made from S355J2 steel include:

1. Yield strength: The yield strength of S355J2 steel is a minimum of 355 N/mm². This is the stress at which the steel begins to deform plastically and is an important factor in determining the load-carrying capacity of the flange.

2. Tensile strength: The tensile strength of S355J2 steel is typically between 470 and 630 N/mm². This is the maximum stress that the steel can withstand before it fractures and is an important factor in determining the overall strength of the flange.

3. Elongation: The elongation of S355J2 steel is typically between 17% and 20%. This is the amount of deformation that the steel undergoes before it fractures and is an important factor in determining the ductility and toughness of the flange.

4. Impact strength: The impact strength of S355J2 steel is typically 27 Joules at -20°C. This is the amount of energy that the steel can absorb without fracturing and is an important factor in determining the resistance of the flange to shock and vibration.

Manufacturers of flanges made from S355J2 steel should ensure that the mechanical properties of the steel meet the relevant standards and guidelines for the specific application. Quality control measures should be in place throughout the manufacturing process to ensure that the final product meets the required standards and is suitable for its intended application.