BS EN 10025-2 S355JR Structural Steel Plates

BS EN 10025-2 S355JR structural steel plates are high-strength, hot-rolled, non-alloy steel plates (minimum 355 MPa yield strength) known for excellent weldability and formability, commonly used in buildings, bridges, and machinery for load-bearing structures where moderate toughness at room temperature is sufficient, as indicated by the 'JR' designation (27 Joules impact energy at +20°C).

DIN EN 10025-2 specifies the technical delivery conditions for flat and long products of hot-rolled non-alloy structural steels. The standard covers grades like EN 10025-2 S235JR steel, EN 10025-2 S235J0, EN 10025-2 S235J2 steel, EN 10025-2 S275JR, EN 10025-2 S275J0 steel, EN 10025-2 S275J2 steel, EN 10025-2 S355JR steel, EN 10025-2 S355J2 steel, EN 10025-2 S355K2 steel, EN 10025-2 S355JR+N, EN 10025-2 S355J0, and EN 10025-2 S450J0 steel. Among these, en 10025-2 s355jr stands out for its fine grain structure, improved machinability, and impact resistance at +20°C, making it suitable for structural components exposed to dynamic loads.

GNEE steel produces en 10025-2 s355jr plates in compliance with DIN EN 10025-2, ensuring traceability and quality certification for global projects. For related grades, explore EN 10025 S355J2G3 material steel plates and EN 10025 S355J2 N material, or refer to the BS EN 10025-2 material grade overview.

En 10025-2 s355jr stands out in the EN 10025-2 family for its balanced properties, offering several benefits:

• High Strength-to-Weight Ratio: With a yield strength of 355 MPa, it enables lighter structures without sacrificing load-bearing capacity, reducing material costs in bridges and high-rise buildings.
• Good Toughness: Tested at +20°C with 27 J impact energy, en 10025-2 s355jr performs reliably in standard environments, suitable for general structural use.
• Excellent Weldability: Low carbon equivalent (CEV ≈ 0.45) allows welding without preheating in many cases, facilitating efficient fabrication for large structures.
• Atmospheric Corrosion Resistance: Additions of silicon and copper provide better resistance to weathering, making it suitable for outdoor applications like offshore platforms.
• Cost-Effectiveness: Offers higher strength than EN 10025-2 S275J2 steel or EN 10025-2 S235J2 steel, allowing for material savings while maintaining performance.
• Compliance and Certification: Meets DIN EN 10025-2 and BS EN 10025-2 material grade requirements, with GNEE steel providing CE marking and EN 10204 3.1/3.2 certificates.

En 10025-2 s355jr has several equivalent materials in international standards, allowing for global sourcing and substitution. The table below details equivalent grades by country/standard:

Key Notes:

ASTM A572 Gr 50: Closest US equivalent, with yield strength of 345 MPa (slightly lower than 355 MPa), but similar tensile properties.

DIN ST52-3: Offers equivalent impact toughness, widely used in Europe.

JIS SM490A: Matches for hot-rolled structural steel, with good weldability.

GB Q345B: Chinese equivalent, suitable for cold-forming and impact testing at +20°C.

Selection Tip: Equivalents may vary slightly in chemical limits; verify with specific project requirements.

The chemical composition of en 10025-2 s355jr is tightly controlled to achieve optimal mechanical properties while maintaining weldability and formability. The table below outlines the typical composition per DIN EN 10025-2:

Key Notes:

Carbon: Limited to 0.24% to ensure good weldability and prevent brittleness, critical for structural applications.

Manganese: Up to 1.60% enhances strength and toughness without compromising ductility.

Phosphorus and Sulfur: Low levels (0.035% max) improve impact resistance, especially at +20°C for JR.

Silicon and Copper: Contribute to atmospheric corrosion resistance, making en 10025-2 s355jr suitable for outdoor structures.

GNEE steel's en 10025-2 s355jr plates undergo stringent chemical analysis to meet DIN EN 10025-2 requirements, with options for additional testing such as ultrasonic inspection.

En 10025-2 s355jr offers excellent mechanical properties, making it versatile for structural engineering. The table below summarizes its key properties per DIN EN 10025-2 (for plates up to 16 mm thickness):

Highlights:

Yield Strength: Minimum 355 MPa ensures structural stability under heavy loads, ideal for bridges and buildings.

Tensile Strength: The 470–630 MPa range provides robustness for dynamic applications.

Elongation: 20% ductility supports forming and welding without cracking.

Impact Toughness: 27 J at +20°C ensures performance in standard conditions, less stringent than EN 10025-2 S355J2 steel (-20°C).

Compared to lower grades like EN 10025-2 S275JR (yield 275 MPa) or EN 10025-2 S235JR (yield 235 MPa), en 10025-2 s355jr offers higher strength, allowing for thinner plates and weight savings in designs.

Thickness tolerance for en 10025-2 s355jr is governed by EN 10029, which specifies tolerances for hot-rolled plates 3 mm thick or above. For S355JR (non-alloy structural steel with ReH ≥ 360 N/mm²), the default is Class A, unless otherwise specified. The table below summarizes EN 10029 Class A thickness tolerances:

Key Notes:

Class A: Standard tolerance for non-alloy steels; tighter classes (B, C, D) are available for precision applications.

Measurement: Tolerances apply outside ground areas; for plates with trimmed edges, tolerances are measured at least 100 mm from the edge.

Customization: GNEE steel offers plates with special tolerances upon request, ensuring compliance with EN 10029 for en 10025-2 s355jr.

These tolerances ensure dimensional accuracy for structural applications, reducing fabrication issues.

En 10025-2 s355jr exhibits excellent weldability due to its low carbon equivalent, compatible with standard processes like SMAW, GTAW, and SAW.

Key considerations:

Preheat: Minimal or no preheating required for plates up to 25 mm, reducing fabrication time.

Post-Weld Heat Treatment (PWHT): Not typically needed, but recommended for thicker plates (>40 mm) to relieve stresses.

Filler Materials: Use low-alloy fillers matching the strength of en 10025-2 s355jr, such as E7018 or ER70S-6.

Fabrication: High ductility (20% elongation) supports bending, rolling, and forming for complex structural components.

GNEE steel supplies en 10025-2 s355jr in normalized conditions, enhancing grain refinement for improved fabrication performance.

En 10025-2 s355jr is versatile and widely used in:

Construction: For bridges, buildings, and stadiums, where high strength and good toughness are required.

Offshore Engineering: In platforms and wind turbines, leveraging its corrosion resistance and impact toughness.

Heavy Machinery: For cranes, excavators, and mining equipment, where durability under dynamic loads is critical.

Shipbuilding: In hulls and superstructures, benefiting from its weldability and strength.

Energy Sector: For pipelines and storage tanks, similar to EN 10025 S355J2G3 material steel plates but with standard toughness.

GNEE steel's en 10025-2 s355jr plates are available in thicknesses from 6–300 mm, with options for cut-to-size and cladding for specialized applications.

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GNEE Steel also supplies a variety of high-strength steel plates, such as A514 Grade F, A572 Grade 50, A588 Grade A, S355JR, S690Q, SS400, S690QL, Q345B, Q345E, etc. If you want to know more about other types of steel plates, you can call the consultation hotline at +8615824687445 or send an email to info@gneesteels.com. You are welcome to consult us, and we are very willing to answer your questions.         

FAQ

What is the difference between S355JR and S355J0?

S355JR is tested for impact toughness at +20°C, while S355J0 is tested at 0°C, making S355J0 better for slightly colder environments.

What is the equivalent of S355JR in ASTM?

S355JR is equivalent to ASTM A572 Grade 50, with similar strength and weldability.

What is the hardness of S355JR?

The typical Brinell hardness (HB) of S355JR is 150–200 HB, depending on thickness and heat treatment.

What is S355JR steel used for?

S355JR is used in construction, bridges, offshore platforms, and heavy machinery due to its high strength and toughness at +20°C.

What is the chemical composition of S355JR?

S355JR has a maximum carbon content of 0.24%, manganese up to 1.60%, and low phosphorus/sulfur levels for enhanced toughness, as detailed in the composition table above.

What are the mechanical properties of S355JR?

S355JR has a minimum yield strength of 355 MPa, tensile strength of 470–630 MPa, and impact toughness of 27 J at +20°C, as summarized in the properties table.

Is S355JR a mild steel?

No, S355JR is a high-strength low-alloy (HSLA) structural steel with a yield strength of 355 MPa, higher than mild steel grades like S235 (235 MPa).

What is the difference between S355JR and S355J2?

S355JR is tested for impact toughness at +20°C, while S355J2 is tested at -20°C, making S355J2 better for colder applications.

en 10025-2 s355jr Production Specifications Table

GNEE steel offers a wide range of production capabilities for en 10025-2 s355jr. The table below summarizes the available specifications:

Key Notes:

Standard Sizes: Plates in 6–100 mm thickness, 2000–2500 mm width, and 6000–12000 mm length are typically in stock for immediate delivery.

Custom Orders: Thicker plates or non-standard sizes are available with short lead times.

Global Reach: GNEE steel's production in China supports worldwide delivery, with efficient logistics for urgent projects.