S355JR steel is a widely used carbon structural steel from Europe, commonly applied in construction, tanks, buildings, bridges, and machinery. Due to its excellent mechanical properties and weldability, it serves as a standard reference material for structural projects.
In other countries, several equivalent grades with similar chemical composition and mechanical properties exist:
Q345B – China
A572 Gr 50 – USA
ST52-3 – Germany
SM490B – Japan
These equivalents are commonly used as substitutes in international projects where S355JR compliance is required.
Chemical Composition of S355JR Equivalent Grades
| Grade | C (t≤16mm) | Si | Mn | P | S | Nb | V | Ti | Cr | Ni | Cu | N | Mo |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Q345B | ≤0.20 | ≤0.50 | ≤1.70 | ≤0.035 | ≤0.035 | ≤0.07 | ≤0.15 | ≤0.20 | ≤0.30 | ≤0.50 | ≤0.30 | ≤0.012 | ≤0.10 |
| A572 Gr 50 | ≤0.23 | ≤0.40 | ≤1.35 | ≤0.04 | ≤0.05 | - | - | - | - | - | - | - | - |
| S355JR | ≤0.27 | ≤0.60 | ≤1.70 | ≤0.045 | ≤0.045 | - | - | - | - | - | ≤0.60 | ≤0.014 | - |
| ST52-3 | ≤0.22 | - | - | ≤0.50 | ≤0.50 | - | - | - | - | - | - | - | - |
| SM490B | ≤0.20 | ≤0.55 | ≤1.60 | ≤0.035 | ≤0.035 | - | - | - | - | - | - | - | - |
Note: Chemical compositions are controlled to ensure high strength, weldability, and toughness, making them closely comparable to S355JR.
Mechanical Properties of S355JR Equivalent Grades
| Grade | Yield Strength ReH (MPa) t≤16mm | Tensile Strength Rm (MPa) 3≤t≤16mm | Elongation A (%) 3≤t≤40mm | Charpy V Test Temp (°C) | Impact Energy (J) |
|---|---|---|---|---|---|
| Q345B | 345 | 470–630 | 20 | 20 | 34 |
| A572 Gr 50 | 345 | 450 | 18 | - | - |
| S355JR | 355 | 470–630 | 22 | 20 | 27 |
| ST52-3 | 355 | 490–630 | 22 | 0 | 27 |
| SM490B | 295 | 490–610 | 18 | - | - |
Both chemical composition and mechanical properties of these equivalent grades are very close to S355JR, ensuring compatibility for most structural applications.
Applications and Availability of S355JR and Its Equivalent Grades
1. Construction:
S355JR and its equivalent grades are widely used in residential, commercial, and industrial construction. They are ideal for structural beams, columns, and load-bearing frameworks, providing high strength, excellent toughness, and reliable stability. These steels allow engineers to design slimmer and lighter structures without compromising safety, making them perfect for modern architectural and civil engineering projects.
2. Industrial Machinery:
These high-strength steels are also essential in the manufacture of industrial machinery and heavy equipment. They are commonly used for frames, supports, bases, and structural components, where the combination of yield strength and ductility ensures reliable performance under dynamic loads. Their good weldability and formability make them easy to integrate into custom machinery designs.
3. Infrastructure Projects:
S355JR and equivalent grades play a critical role in infrastructure applications, including bridges, tanks, pipelines, platforms, and industrial installations.
Their high load-bearing capacity and long-term durability make them suitable for both above-ground and underground structures, and in projects exposed to moderate environmental stress. Proper surface treatment or galvanisation can further extend their service life in harsh conditions.
4. Availability and Customer Support:
These steels are main products of Gnee Steel, and are stocked in a variety of dimensions and thicknesses. Customers can request:
Price and availability: Flexible options for standard and customized sizes.
Detailed features and specifications: Complete chemical composition, mechanical properties, and certificates (EN 10204 3.1/3.2, ABS, BV, DNV-GL, CCS, TUV, LR, SGS).
Application guidance and technical support: Gnee Steel offers expert consultation for material selection, structural design, welding, cutting, and installation, ensuring the steel is used efficiently and safely in your projects.
:
With S355JR and its equivalent grades from Gnee Steel, engineers and builders can rely on consistent quality, high performance, and wide application versatility.
Whether used in construction, machinery, or infrastructure, these steels provide a cost-effective, durable, and technically reliable solution for structural needs worldwide.
Q1: What is S355JR channel steel?
A:
S355JR channel steel is a low-alloy, hot-rolled structural steel produced according to EN 10025-2. It offers a minimum yield strength of 355 MPa and is widely used in construction, machinery, and general structural applications.
Q2: What standard does S355JR channel steel comply with?
A:
S355JR channel steel follows EN 10025-2:2004, which defines the technical delivery conditions for non-alloy structural steels. The standard ensures that mechanical properties, chemical composition, and quality are consistent across different production batches.
Q3: What are the typical mechanical properties of S355JR channel steel?
A:
Yield strength: ≥ 355 MPa
Tensile strength: 470–630 MPa
Elongation: ≥ 20% (depends on section size)
These properties provide a good balance of strength, ductility, and toughness for standard structural applications.
Q4: Does S355JR channel steel require impact testing?
A:
Yes. As a JR grade, S355JR is impact tested at 20°C (room temperature). This ensures adequate toughness for normal temperature applications, but it is not suitable for low-temperature environments.
Q5: How does S355JR differ from S355J2 channel steel?
A:
The main difference lies in low-temperature performance.
S355JR: Impact tested at 20°C, suitable for normal temperature conditions.
S355J2: Impact tested at -20°C, suitable for colder environments.
Other mechanical properties such as yield strength and tensile strength are similar.
Q6: Is S355JR channel steel weldable?
A:
Yes. S355JR has excellent weldability due to its low carbon content. Standard arc welding and gas welding are suitable. Preheating is generally not required for thin sections, but may be used for thicker sections to reduce residual stress.
Q7: What are the typical applications of S355JR channel steel?
A:
Structural frameworks for buildings and bridges
Support beams and columns
Machinery bases and chassis
General fabrication where moderate strength is sufficient
Q8: What size range is available for S355JR channel steel?
A:
S355JR channels are commonly available in heights from 80 mm to 300 mm and thicknesses from 5 mm to 20 mm, depending on the manufacturer. Custom lengths and cutting services can often be provided on request.
Q9: Can S355JR channel steel be cut or machined?
A:
Yes. It can be flame cut, sawed, drilled, or milled using standard tools and procedures. Its moderate hardness allows for easy processing without special equipment.
Q10: What inspection and certification are supplied with S355JR channel steel?
A:
Material is usually supplied with EN 10204 3.1 or 3.2 mill test certificates, covering chemical composition, mechanical properties, and dimensional verification. Additional testing, such as ultrasonic or magnetic particle inspection, can be provided for critical applications.