What is S355JR steel?
S355JR is a high-strength structural steel manufactured in accordance with the EN 10025-2 standard.
To understand its engineering capabilities, we can decode its designation:
"S" stands for Structural steel.
"355" denotes a minimum yield strength of 355 MPa.
"JR" indicates its specific impact toughness requirement-it guarantees a minimum Charpy V-Notch impact energy of 27 Joules at room temperature (+20°C).
Renowned for its exceptional balance of high strength, excellent ductility (plasticity), and superior weldability, S355JR is extensively utilized across heavy industries. Typical applications include building construction, bridge fabrication, shipbuilding, heavy engineering machinery, and pressure vessels.
Today, it remains one of the most mainstream and universally specified structural steel grades in both European and global markets.
S355JR Low alloy steel plate EN10025
steel Standard: EN 10025-2
Rolling Type: Structural steel plate, low alloy steel plate
Thickness:2mm-650mm
Width:1000mm-4200mm
Length:3000mm-18000mm
Heat Treatment: As rolled/Control-rolled/Normalized
Applicable Standards & Specifications
S355JR is manufactured in strict compliance with the EN 10025-2 standard, which specifies the technical delivery conditions for non-alloy structural steels. This normative standard precisely dictates the essential technical requirements of the steel, including its chemical composition, mechanical properties, inspection protocols, and delivery conditions.
Chemical composition for S355JR low alloy steel (Ladle Analysis Max%)
| Main chemical elements composition of S355JR | |||||||
| Thickness(mm) | C | Si | Mn | P | S | N | Cu |
| T≤16 | 0.24 | 0.55 | 1.60 | 0.035 | 0.035 | 0.012 | 0.55 |
| 16 | 0.24 | ||||||
| 40 | 0.24 | ||||||
Mechnical property for S355JR low alloy steel:
| Thickness (mm) | |||||||||
| S355JR | ≤ 16 | > 16 ≤ 40 | > 40 ≤ 63 | > 63 ≤ 80 | > 80 ≤ 100 | > 100 ≤ 150 | > 150 ≤ 200 | > 200 ≤ 250 | > 250 |
| Yield strength (≥Mpa) | 355 | 345 | 335 | 325 | 315 | 295 | 285 | 275 | 275 |
| < 3 | ≥ 3 ≤ 100 | > 100 ≤ 150 | > 150 ≤ 250 | > 250 | |||||
| Tensile strength (Mpa) | 510-680 | 470-630 | 450-600 | 450-600 | 450-600 | ||||
Processing & Delivery Conditions
Delivery States (+AR, CR, +N):
S355JR is typically supplied in the As-Rolled (Hot Rolled, +AR) condition. Depending on specific project requirements, it can also be delivered in the Controlled Rolled (CR) or Normalized (+N) condition.
The standard hot-rolled delivery state provides a highly cost-effective solution while maintaining excellent comprehensive mechanical properties for most structural projects.
Excellent Weldability & Fabrication
Due to its low carbon content and optimally balanced manganese levels, S355JR exhibits outstanding weldability. It can be seamlessly joined using all conventional welding processes, including Shielded Metal Arc Welding (SMAW) and Gas-Shielded Welding (GMAW/MIG/MAG).
Expert Fabrication Tip: While highly weldable, when welding heavy-gauge (thick) plates or operating in sub-zero environments, engineers must apply proper pre-heating and Post-Weld Heat Treatment (PWHT). This controls the cooling rate and prevents cold cracking in the weld's Heat-Affected Zone (HAZ).
Primary Applications of S355JR Steel
Benefiting from its high yield strength (355 MPa) and excellent machinability, S355JR is widely specified across heavy-duty engineering sectors globally:
🏗️ Construction & Architecture: High-rise building frameworks, industrial plant steel columns, and heavy load-bearing steel beams.
🌉 Bridge Engineering: Main girders, structural supports, and critical load-bearing bridge components.
🚜 Heavy Machinery Manufacturing: Excavator booms, crane structures, earthmoving equipment, and heavy-duty commercial vehicle chassis.
🚢 Shipbuilding & Marine: Hull decks, structural bulkheads, and truss structures.
⚡ Other Infrastructure: Large-diameter pipelines, low-pressure vessels, and power transmission towers.
Available Sizes & Specifications for S355JR Steel Plates
(All dimensions are represented as Thickness × Width × Length in mm)
At GNEE Steel, we maintain a vast inventory of S355JR heavy plates to meet the urgent demands of global infrastructure projects. Below is our standard stock availability:
| Material Grade | Thickness (mm) | Width Range (mm) | Length Range (mm) |
| S355JR Plate | 10 | 2000 - 3200 | 6000 - 13000 |
| S355JR Plate | 12 | 2000 - 2800 | 8000 - 10000 |
| S355JR Plate | 15 | 2000 - 2400 | 6000 - 9000 |
| S355JR Plate | 16 | 2000 - 2500 | 8500 - 12000 |
| S355JR Plate | 20 | 2000 - 2900 | 9600 - 12000 |
| S355JR Plate | 25 | 2000 - 2300 | 6500 - 12000 |
| S355JR Plate | 30 | 2000 - 3200 | 5500 - 12000 |
| S355JR Plate | 40 | 2000 - 3600 | 6000 - 12000 |
| S355JR Plate | 45 | 2000 - 3000 | 6000 - 12000 |
Are your project requirements outside our standard sizes? No problem.
All dimensions listed above are fully negotiable and customizable. We do not just supply raw plates; we offer comprehensive Value-Added Fabrication Services.
Simply send us your CAD drawings, and our state-of-the-art processing center will provide:
✅ Precision CNC Cut-to-Size: Plasma, laser, and waterjet cutting to your exact shapes.
✅ Deep Processing: Edge beveling, drilling, bending, and welding.
👉 [Upload Your Drawings Here for a Custom Fabrication Quote]
Structural Steels S275 vs S355
S275 and S355 steel grades are intended for structural purposes and are produced in accordance with EN 10025-2. They can be bolted, riveted and welded in a full range of structural and fabricated items including bridges, box girders, cranes and general structural projects. These steel grades are supplied with a variety of treatments and test options to ensure that they are highly usable in various projects.
S355J2+N grade possesses improved cold-forming properties because it is fully killed and supplied in an as normalised condition.
Product designation
S - Structural steel
275/ 355 - Minimum yield strength in MPa
JR (20˚C), J0 (0˚C) and J2/ K2 (-20˚C) - Charpy V-notch at different temperatures
AR (as rolled), +N/ G3 (normalised) - Delivery conditions
Chemical Composition
| Grade (牌号) | C content (t<16mm) % | C content (16 | C content (t>40mm) % | Mn % | Si % | P % | S % | Cu % | N % |
| S275JR | 0.19 | 0.19 | 0.23 | 1.50 | - | 0.045 | 0.045 | 0.60 | 0.014 |
| S355JR | 0.27 | 0.27 | 0.27 | 1.70 | 0.60 | 0.045 | 0.045 | 0.60 | 0.014 |
| S355J0 | 0.23 | 0.23 | 0.24 | 1.70 | 0.60 | 0.040 | 0.040 | 0.60 | 0.014 |
| S355J2/K2 | 0.23 | 0.23 | 0.24 | 1.70 | 0.60 | 0.035 | 0.035 | 0.60 | - |
Mechanical Properties
| Grade | Minimum Yield Strength (MPa) | Tensile Strength (MPa) | Minimum Elongation (%) | Charpy V-notch Temperature (°C) | Charpy V-notch Minimum Impact (J) |
| S275JR | 275 | 410 - 560 | 23 | 20 | 27 |
| S355JR | 355 | 470 - 630 | - | 20 | 27 |
| S355J0 | 355 | 470 - 630 | - | 0 | 27 |
| S355J2 | 355 | 470 - 630 | 17 | -20 | 27 |
| S355K2 | 355 | 470 - 630 | 17 | -20 | 40 |
📌 Note
Chemical composition: Ladle / product analysis in % max.
Mechanical properties: Tested at ambient temperature.
Dimensions and tolerances: In strict accordance with EN 10029.
Approximate Equivalents
| Grade | BS 4360 | SANS 1431 | ASTM | GB/T 1591 | Others |
| S275JR | 43B | 300 WB | A283 GRD | Q345 | - |
| S275J0 | 43C | 300 WC | A529 GR42 | Q345 | - |
| S355JR + AR | 50B | 350 WA | A572 / 529 GR50 | Q345 | ST 52-3 / SS490 / S550 |
| S355J0 | 50C | 350 WC | A572 / 529 GR50 | Q345 | ST 52-3 / SS490 / S550 |
| S355J2G3/ + N | 50D | 350 WDD | A572 / 529 GR50 | Q345 | ST 52-3 / SS490 / S550 |
Why Choose GNEE steel for S355JR Steel Plates?
GNEE steel is a trusted supplier of S355JR and equivalent 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.
Global Supply: Competitive pricing and reliable delivery from China to worldwide markets.
Technical Support: Guidance on selecting S355JR versus other grades like EN 10025-2 S355J0 or EN 10025-2 S355K2 steel.
GNEE STEEL: S355JR (1.0045) Ready Stock & Available Specifications
▶ S355JR (1.0045) Steel Bars
Hot Rolled Black Round Bar: Φ50 - 600 mm, Length: 1000 - 4000 mm
Peeled / Turned Round Bar: Φ60 - 600 mm, Length: 1000 - 5000 mm
Hot Rolled Round Bar: Φ20 - 50 mm, Length: 1000 - 5000 mm
Cold Drawn Round Bar: Φ4 - 20 mm, Length: 1000 - 5000 mm
▶ S355JR (1.0045) Wire Rods
Hot Rolled Wire Rod: Φ5.5 - 25 mm (Supplied in Coils)
Cold Drawn Wire: Φ0.5 - 15 mm / Φ5.5 - 25 mm (Supplied in Coils or Spools)
▶ S355JR (1.0045) Steel Plates & Sheets
Hot Rolled Steel Plate: Thickness (T) 4.5 - 36 mm | Width (W) 650 - 2000 mm | Length (L) 1000 - 45000 mm
Cold Rolled Steel Sheet: Thickness (T) 0.8 - 4.5 mm | Width (W) 650 - 1000 mm | Length (L) 800 - 2200 mm
▶ S355JR (1.0045) Steel Pipes & Tubes
Seamless Pipe: Custom fabricated to client specifications / CAD drawings.
Welded Pipe: Customized production based on project requirements.
▶ S355JR (1.0045) Flanges
Flanges & Forgings: Custom forged and CNC machined upon request.
▶ S355JR (1.0045) H beam/C channel/Equal Unqual Angle bar
▶S355JR Diamond / Checkered plate
Read more:
The difference of steel material S355JR and S355J0
S355JR VS Q355B
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