Products Description
S235JR and S355JR Hot Rolled Steel Coils are high-quality structural steel products manufactured in strict accordance with EN 10025-2 standards. These non-alloy structural steels offer excellent weldability, formability, and consistent mechanical properties, making them the preferred choice for construction, infrastructure, and heavy industrial applications worldwide.
S235JR provides cost-effective durability for lightweight structures and general machinery-38,while S355JR delivers significantly higher strength (355 MPa yield) for heavy-duty structural applications such as bridges, wind turbines, and high-rise buildings.
Both grades are available with customizable dimensions, surface treatments, and coil weights to meet diverse project requirements.
1.Standard Sizes (Most Frequently Exported)
| Parameter | S235JR | S355JR |
| Standard | EN 10025-2 | EN 10025-2 |
| Material Number | 1.0038 | 1.0045 |
| Thickness | 1.2mm – 25mm (customizable up to 200mm) | 1.2mm – 25mm (customizable up to 200mm) |
| Width | 600mm – 2,500mm (customizable) | 600mm – 2,500mm (customizable) |
| Coil Weight | 3 – 50 tons (customizable) | 3 – 50 tons (customizable) |
| Coil Inner Diameter | 508mm / 610mm | 508mm / 610mm |
2.Commonly Exported Thickness Ranges
| Thickness Range | Typical Applications |
| 1.2mm – 3.0mm | Light structural components, roofing, automotive parts |
| 3.0mm – 12.0mm | General structural framing, beams, columns |
| 12.0mm – 25.0mm |
Heavy-duty structural components, bridge elements |
3.Surface Finishes Available
| Finish | Description |
| Black (Mill Scale) | As-rolled surface with natural oxide scale; economical for applications where surface finish is not critical |
| Pickled | Acid-pickled to remove mill scale; clean surface for further processing |
| Oiled | Pickled surface with rust-preventive oil coating; ideal for extended storage or transit |
| Pickled & Oiled | Combination treatment for superior corrosion protection during shipping |
4.Equivalents & Cross-References
| EN Grade | Material No. | ASTM Equivalent | JIS Equivalent | GB Equivalent | DIN Equivalent |
| S235JR | 1.0038 | A283 Gr C | SS400 | Q235B | St37-2 |
| S355JR | 1.0045 | A572 Gr 50 | SM490 | Q355B (formerly Q345B) | St52-3 |
Technical Parameters
Chemical Composition (Heat Analysis)
| Element | S235JR (max %) | S355JR (max %) |
| Carbon (C) | 0.17 – 0.20 | 0.24 |
| Silicon (Si) | ≤ 0.40 | ≤ 0.55 |
| Manganese (Mn) | ≤ 1.40 | ≤ 1.60 |
| Phosphorus (P) | ≤ 0.035 | ≤ 0.035 |
| Sulfur (S) | ≤ 0.035 | ≤ 0.035 |
| Nitrogen (N) | ≤ 0.012 | ≤ 0.012 |
| Copper (Cu) | ≤ 0.55 (optional) | ≤ 0.55 |
Mechanical Properties
| Property | S235JR | S355JR |
| Yield Strength (ReH) – t ≤ 16mm | ≥ 235 MPa | ≥ 355 MPa |
| Yield Strength (ReH) – 16mm < t ≤ 40mm | ≥ 225 MPa | ≥ 345 MPa |
| Tensile Strength (Rm) – t ≤ 16mm | 360 – 510 MPa | 510 – 680 MPa |
| Tensile Strength (Rm) – 16mm < t ≤ 40mm | 360 – 510 MPa | 470 – 630 MPa |
| Elongation (A5) – t ≤ 40mm | ≥ 26% | ≥ 22% |
| Charpy V Impact (20°C) | ≥ 27 J | ≥ 27 J |
Dimensional Tolerances (Typical)
| Parameter | Tolerance |
| Thickness | ±0.15mm – ±0.30mm |
| Width | ±3mm – ±10mm |
Key Product Features:
- Excellent Weldability: Low carbon content ensures good weldability without preheating for most applications
- Superior Formability: Hot-rolled process delivers excellent ductility for bending, stamping, and forming operations
- High Load-Bearing Capacity: Improved fatigue resistance for structural components, base plates, beams, and industrial frames
- Cost-Effective: Superior price-to-performance ratio for large-scale manufacturing
- ISO 9001 Certified: Production and management systems audited to meet international quality standards
Applications
》S235JR – Light to Medium-Duty Applications
| Industry | Specific Applications |
| Construction | Light industrial frameworks, residential building structures, secondary load-bearing beams,auxiliary supports |
| General Manufacturing | Machinery components, equipment bases and supports |
| Automotive | Roofing sheets, car ceiling components, outer shells |
| Infrastructure | Bridges and road barriers, pipelines and profiles |
| Shipbuilding | Ship structural parts, container frames |
》S355JR – Heavy-Duty & High-Strength Applications
| Industry | Specific Applications |
| Heavy Construction | High-rise buildings, industrial workshops, bridge engineering |
| Infrastructure | Bridge structural components, connection plates, reinforcing plates |
| Machinery Manufacturing | Heavy machinery frames, construction machinery, hydraulic machinery |
| Energy | Wind turbines, port terminals, offshore platforms |
| Mining | Mining and metallurgical machinery and equipment |
| Transportation | Truck frames, crane booms, dump trucks, trailers |
| Steel Structure Fabrication | H-beams, angle steel, channels, steel plates and profiles |
》Common Applications for Both Grades
- Pipes and Tubes: Base material for welded steel pipes and tubes for oil/gas transmission, water pipelines
- Pressure Vessels: Large-scale storage tanks and pressure vessels
- Further Processing: Starting material for cold rolling, pickling, or galvanizing
- Structural Steel Fabrication: I-beams, H-beams, angle steel, channels
FAQ
Q1: What is the difference between S235JR and S355JR?
A: The primary difference is yield strength. S235JR has a minimum yield strength of 235 MPa, making it ideal for light to medium-duty projects. S355JR offers a minimum yield strength of 355 MPa – approximately 50% stronger – making it suitable for heavy-duty structural applications. S355JR also offers better impact toughness at -20°C.
Q2: What does the "JR" designation mean?
A: "JR" indicates the Charpy V-notch impact test temperature. JR means the steel is tested at +20°C with a minimum impact energy of 27 J. Other suffixes include J0 (tested at 0°C) and J2 (tested at -20°C).
Q3: What standard are these coils manufactured to?
A: Both S235JR and S355JR are manufactured according to EN 10025-2:2019 "Hot rolled products of structural steels – Part 2: Technical delivery conditions for non-alloy structural steels". EN 10025-2 covers plates, sections, bars, and wide flats in hot rolled condition.
Q4: What surface finishes are available?
A: Available finishes include black (mill scale as-rolled), pickled (acid-cleaned), oiled (with rust-preventive oil), and pickled & oiled (combined treatment for maximum corrosion protection during transit).
Q5: What are the typical lead times?
A: S235JR and S355JR are stock items at most major mills, with typical lead times of 15–25 days for standard specifications-. Custom sizes may require additional production time.
Q6: Are these coils weldable?
A: Yes. Both grades offer excellent weldability due to their low carbon content. Most applications do not require preheating. They are also highly formable and machinable.
Q7: What are the equivalent grades in other standards?
A: S235JR is equivalent to ASTM A283 Gr C, JIS SS400, and GB Q235B. S355JR is equivalent to ASTM A572 Gr 50, JIS SM490, and GB Q355B (formerly Q345B).
Q8: What is the typical packaging for export?
A: Coils are wrapped with protective film or plastic sheeting, securely strapped with steel bands, and clearly labeled with specifications, weight, and production date. Options include bulk cargo (high payload, lower cost) or containerized cargo (superior protection, easier handling). Seaworthy packaging with anti-rust treatment and waterproofing is standard
Q9: What payment and trade terms are available?
A: Common trade terms include FOB, CFR, CIF, and EXW. Payment is typically via T/T or L/C. MOQ is negotiable, typically starting from 1 ton.
Q10: Can dimensions be customized?
A: Yes. Thickness, width, coil weight, and length can all be customized to meet specific project requirements
Our address
Rm1406,14th/F No 208, Hongqi Road, Nankai Dist, Tianjin City ,China
Phone Number (WhatsApp/wechat)
+8616622033809
alisa@tjshenzhoutong.com
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