Q355B steel plate is a low-alloy, high-strength structural steel plate produced in China (compliant with the GB/T 1591-2018 standard), featuring a minimum yield strength of 355 MPa and designed specifically for demanding engineering and construction applications.
Renowned for its excellent weldability, toughness, and exceptional strength-to-weight ratio, this steel grade frequently serves as a cost-effective alternative to Q345B and is widely utilized in the construction of bridges, buildings, and heavy machinery.
Chemical Composition of Q355B Steel Plate
| Material | C | Si | Mn | P | S | Cr. | Ni | Cu | N |
| Q355B | ≤0.20% | ≤0.55% | ≤1.60% | ≤0.030% | ≤0.030% | ≤0.30% | ≤0.30% | ≤0.40% | ≤0.012% |
Mechanical Properties of Q355B Steel Plate
| Property | Typical Value/Range (Metric) |
|---|---|
| Yield Strength (0.2% offset) | 355 MPa (Min) |
| Tensile Strength | 470 - 630 MPa |
| Elongation | ≥ 20% |
| Impact Strength (Charpy) | ≥ 27 J |
| Impact Test Temp | +20°C |
Why Choose Q355B Steel Plate for Engineering & Construction Structures?
High Strength and Durability: Q355B boasts a minimum yield strength of 355 MPa and a tensile strength ranging from 490 to 630 MPa. This enables it to bear heavy structural loads and withstand immense stress, delivering exceptional performance in applications ranging from high-rise buildings to mechanical equipment.
Excellent Weldability: Despite being a high-strength steel, Q355B ensures excellent weldability-with minimal susceptibility to cracking-through precise control of carbon content (C ≤ 0.2%) and the addition of trace alloying elements. This makes it highly suitable for welding operations conducted either on-site or in a factory setting.
Low-Temperature Impact Toughness (Grade B Standard): The "B" designation in Q355B signifies that it meets the standard for impact testing conducted at 20°C. This ensures that the material retains robust impact resistance even when deployed in low-temperature environments, such as in cold regions.
Economic and Lightweight Advantages: Thanks to its high strength, Q355B steel allows for smaller cross-sections and lighter self-weight while achieving equivalent load-bearing capacity. This not only reduces the overall volume of steel material required but also lowers the construction costs associated with foundation engineering.
Applications of Q355B Steel Plate In Engineering & Construction Structures
Structural Steel Construction
Load-Bearing Components: Used to fabricate beams, columns, and other framework elements for high-rise buildings, large-scale industrial plants, exhibition centers, and similar structures.
Shear Walls and Bracing: Employed to enhance the overall stability and safety of buildings.
Pre-Bending and Forming: Utilizes Q355B steel to fabricate box columns and structural steel profiles.
Bridge Engineering
Main Girders and Pile Foundations: Due to its high strength, this material is ideally suited for the primary support frames and substructures of highway and railway bridges, ensuring long-term structural integrity and safety.
Heavy Machinery and Equipment Manufacturing
Structural Frames and Components: Used to manufacture critical load-bearing parts for mining machinery, port equipment, and other heavy-duty machinery.
Specialized Vehicles: Leverages the material's high strength and toughness to reduce the dead weight of heavy-duty transport vehicles while simultaneously increasing their payload capacity.
Energy and Offshore Engineering
Steel Pipelines and Storage Tanks: Widely utilized in oil and gas transmission pipelines, as well as in the construction of large-scale energy storage tanks.
Shipbuilding: Applied in the construction of ship hulls and structural frameworks.
Why Choose Us?
✅ Custom Processing Services
GNEE offers professional cutting services capable of processing a wide variety of custom shapes. Furthermore, GNEE can supply steel materials with customized dimensions-specifically tailored in both thickness and width-to meet the specific requirements of any given project.
✅ Reliable Supply Chain and Service
GNEE maintains substantial inventory levels to ensure rapid delivery and minimize lead times. Additionally, GNEE products have been exported to over 60 countries, and we provide professional export packaging services to guarantee the safe arrival of all shipments.
✅ Advanced Equipment
We operate 12 profile production lines and 7 steel plate production lines. Our entire suite of automated production equipment features imported components and configurations.
✅ Quality Assurance
We hold numerous quality certifications-including ISO, API, SGS, and MTC-and offer third-party inspection services. Our delivery conditions encompass a wide range of options, such as AR, CR, TMCP, QT, and N.
✅ 24-Hour Online Service
We have established a comprehensive, round-the-clock (24-hour) after-sales service system. Customers can contact our after-sales team at any time-via telephone, email, or online chat support-to promptly report issues and receive professional assistance and solutions.
Contact now to get Q355B steel plate
| Type | Q355B |
| Standard | AISI, ASTM, BS, GB, DIN, JIS, etc |
| Certificate | ISO,SGS,CE |
| Length |
Production according to customer requirements |
| Thickness | 8-160MM |
| Width | 2000-2500MM |
| Surface | Coated |
| Technique | Hot rolled |
| Package | Available on request or Standard Export Packing |
| Application | Widely used in Building Construction, Bridge, Architecture, Vehicles Components,hipping,High pressure container, Boiler, Large Structure steel etc. |
What is the hardness of Q355B material?
Q355B round steel hardness is 85-95 HRB. Q355B steel is a low-alloy high-strength structural steel, widely used in bridges, vehicles, ships, buildings, pressure vessels, special equipment, etc.
What is the material equivalent to Q355B material equivalent Indian standard?
IS 2062 E350 or IS 8500 FE 570 are Indian standards that can be considered as equivalents to Q355B, commonly used in structural applications in India.
What is Q355B structural steel?
Q355B steel represents the ideal balance of performance, cost efficiency, and adaptability for modern structural and industrial projects. Its combination of 355 MPa yield strength, excellent weldability, and toughness across varied temperatures makes it a trusted material for engineers worldwide.
What is the impact test for Q355B?
Q355B square steel pipe exhibits excellent impact performance. At a room temperature of 20°C, its impact absorbed energy is no less than 34J. This value reflects the material's ability to absorb energy when subjected to impact loads and is a key indicator for evaluating its resistance to brittle fracture.