What are the properties of EN 10025 S355J2

EN 10025 S355J2 is a non-alloy structural steel grade from the European standard EN 10025-2, which specifies hot-rolled products of structural steels. This grade is widely used in construction, engineering, and manufacturing due to its excellent combination of strength, toughness, and weldability. S355J2 is characterized by a minimum yield strength of 355 MPa, making it suitable for load-bearing applications where high performance is required under varying temperatures. The "S" denotes structural steel, "355" refers to the minimum yield strength in MPa, and "J2" indicates a minimum impact energy of 27 J at -20°C. This article provides a detailed overview of the properties of EN 10025 S355J2, including chemical composition, mechanical properties, weldability, applications, and comparisons with other grades, helping engineers, fabricators, and procurement specialists understand its suitability for specific projects.

Mechanical Properties of EN 10025 S355J2

EN 10025 S355J2 exhibits robust mechanical properties, making it suitable for demanding structural applications. The properties vary slightly with plate thickness, but the table below summarizes the key values for plates up to 16 mm thick, as per EN 10025-2. For thicker plates, yield strength decreases (e.g., 345 MPa for 16–40 mm).

Key Notes on Mechanical Properties:

• Yield Strength: 355 MPa min allows S355J2 to handle high loads, making it stronger than grades like S275JR (275 MPa) but comparable to S355J0 (355 MPa at 0°C).
• Tensile Strength: 470–630 MPa provides excellent resistance to breaking under tension, suitable for dynamic loads in bridges and cranes.
• Elongation: 20% min ensures good ductility, allowing the steel to deform without fracturing during fabrication or under stress.
• Impact Toughness: 27 J at -20°C guarantees resistance to brittle failure in cold conditions, a key feature for outdoor or low-temperature applications.
• Hardness: 150–200 HB indicates moderate hardness, making it easy to machine and form while maintaining durability.

These properties make S355J2 a reliable choice for welded structures, with normalization enhancing grain structure for better toughness. Gangsteel offers S355J2 plates with customized testing to meet project-specific needs.

Weldability and Fabrication Properties

EN 10025 S355J2 has excellent weldability due to its low carbon equivalent (CEV max 0.45 for thicknesses up to 30 mm), allowing for welding without preheating in many cases. It is compatible with common welding methods like SMAW (using low-hydrogen electrodes such as E7018), GTAW, and SAW. For thicker plates (>40 mm), preheating to 100–150°C is recommended to avoid cracking in the heat-affected zone (HAZ).

Fabrication properties include good machinability (due to moderate hardness) and formability (high elongation). It can be bent, rolled, and cut with standard equipment, but post-weld heat treatment (PWHT) at 600–650°C is advised for stress relief in ASME-coded applications. Gangsteel’s S355J2 plates are supplied in normalized condition to optimize these properties.

Physical Properties

Physical properties of EN 10025 S355J2 contribute to its usability in various environments:

• Density: 7.85 g/cm³, typical for carbon steels, ensuring predictable weight calculations in design.
• Thermal Conductivity: Approximately 50 W/m·K at room temperature, suitable for heat transfer in structural components.
• Coefficient of Thermal Expansion: 11–13 × 10^-6 /K, allowing for stable performance in temperature-varying conditions.
• Modulus of Elasticity: 210 GPa, providing stiffness for load-bearing structures.
• Poisson's Ratio: 0.3, indicating typical elastic behavior under stress.

These properties make S355J2 versatile for both static and dynamic loads, with good resistance to thermal expansion in construction.

Corrosion Resistance and Durability

EN 10025 S355J2 has moderate corrosion resistance in non-aggressive environments, enhanced by silicon and copper additions that form a protective patina in atmospheric exposure. For corrosive conditions, it can be painted or galvanized. Its durability is evident in its fatigue resistance and toughness, with a fatigue limit around 150–200 MPa for cycles up to 10^7. In low-temperature applications, its -20°C impact toughness prevents brittle failure, extending service life in cold climates. Gangsteel offers clad or coated S355J2 plates for enhanced durability in harsh environments.

Comparison with Other EN 10025 Grades

EN 10025 S355J2 is part of the S355 family, offering higher strength than S275 grades but similar toughness to S355J0 (tested at 0°C) and S355K2 (40 J at -20°C). The table below compares S355J2 with other EN 10025-2 grades:

S355J2's -20°C toughness makes it superior to S355JR for cold applications, while its strength exceeds S275J2 (275 MPa yield). For higher strength, consider EN 10025-2 S450J0 steel.

Applications of EN 10025 S355J2

EN 10025 S355J2 is versatile and widely used in:

1. Construction: For high-rise buildings, bridges, and stadiums, where high strength and low-temperature toughness are required.
2. Offshore Engineering: In platforms and wind turbines, leveraging its corrosion resistance and impact toughness.
3. Heavy Machinery: For cranes, excavators, and mining equipment, where durability under dynamic loads is critical.
4. Shipbuilding: In hulls and superstructures, benefiting from its weldability and strength.
5. Energy Sector: For pipelines and storage tanks, offering reliability in varying temperatures.

Gangsteel’s S355J2 plates are available in thicknesses from 6–300 mm, with options for cut-to-size and cladding for specialized applications like EN 10025-2 S355K2 steel.

Why Choose Gangsteel for EN 10025 S355J2?

Gangsteel is a trusted supplier of EN 10025 S355J2 plates, offering:

• Certified Quality: Plates undergo ultrasonic testing, Charpy impact tests at -20°C, and chemical analysis to meet EN 10025-2 standards.
• Customization: Available in thicknesses from 6–300 mm, with options for normalization, cut-to-size, and beveling for efficient fabrication.
• Global Supply: Competitive pricing and reliable delivery from China to worldwide markets, with stock in key ports for fast turnaround.
• Technical Support: Expert guidance on selecting S355J2 versus other grades like EN 10025-2 S355J0 or EN 10025-2 S355K2 steel.
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Gangsteel Solution

EN 10025 S355J2 is a versatile structural steel with high strength (yield 355 MPa), tensile range of 470–630 MPa, and impact toughness of 27 J at -20°C, making it ideal for construction and engineering. Gangsteel’s S355J2 plates ensure compliance and reliability for your projects. For equivalent standards, explore our BS EN 10025-2 material grade guide.

Keywords: EN 10025 S355J2 properties, S355J2 chemical composition, S355J2 mechanical properties, S355J2 applications