Hot-rolled Q355B Steel with High Yield Strength Excellent Weldability and Corrosion Resistance for Structural Applications
Hot-rolled Q355B H-beams are high-strength structural components (355 MPa minimum yield strength) manufactured according to the GB/T 1591-2018 standard, representing the modern upgrade to Q345B. They are primarily used in heavy machinery, high-rise buildings, and steel structures due to their excellent weldability and mechanical properties, directly comparable to European S355JR or American A572 Gr.50.
Key Characteristics of Q355B H-Beams
Standards & Grades: Produced under GB/T 1591, with 'B' indicating impact toughness at 20°C.
Material Properties: High yield strength (> 355 MPa for thickness < 16mm) and tensile strength (470 - 630 MPa).
Applications: Widely used in factories, bridges, and offshore structures standards
Equivalent International Steel Products:Q355B is largely recognized as interchangeable with the following international
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Mechanical Property for Q355B steel plate |
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Thickness (mm) |
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Yield strength (≥Mpa) |
T≤16 |
16<T≤40 |
40<T≤63 |
63<T≤80 |
80<T≤100 |
100<T≤150 |
150<T≤200 |
200<T |
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355 |
345 |
335 |
325 |
315 |
295 |
285 |
275 |
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Tensile strength (Mpa) |
T≤100 |
100<T≤150 |
150<T≤250 |
250<T≤4000 |
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470-630 |
450-600 |
450-600 |
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Main chemical elements composition of Q355B |
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C |
Si |
Mn |
P |
S |
Cr |
Ni |
Cu |
N |
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0.24 |
0.55 |
1.60 |
0.035 |
0.035 |
0.30 |
0.30 |
0.40 |
0.012 |
Q355B vs. S355JR:
Q355B and S355JR are largely interchangeable for structural applications due to nearly identical mechanical properties and chemical compositions. Q355B is a cost-effective choice within Asia, while S355JR is common for European projects.
What Are The Advantages Of Q355B Steel?
Q355B steel has the following main advantages:
- High strength: Q355B steel has high yield strength and tensile strength, usually with a yield strength of 355 MPa, so it can provide good structural support and load-bearing capacity in many engineering applications.
- Good plasticity and weldability: This steel has good plasticity and processability, is easy to bend, shape and weld, and can meet various engineering design requirements.
- Excellent corrosion resistance: Q355B steel usually has good corrosion resistance, can resist corrosion and oxidation under some environmental conditions, and is suitable for a variety of engineering environments.
- Lower cost: Relative to some higher strength steels, the cost of Q355B steel may be relatively low, making it economical and cost-effective in some projects.
- Versatility: Q355B steel has a wide range of uses and is suitable for many fields such as building structures, bridges, machinery manufacturing, and shipbuilding.
- These advantages make Q355B steel widely used in structural engineering and various construction fields, and can meet many engineering design and manufacturing requirements.
What Are The Specific Uses of Q355B Steel?
Q355B structural steel is widely used in various engineering fields and construction projects due to its excellent mechanical properties and corrosion resistance. Specific uses include but are not limited to:
- Building structure: used for structural components such as beams, columns, trusses, stairs, etc. of buildings. Q355B’s high strength and good weldability make it a commonly used material in building structures.
- Bridge engineering: Suitable for bridge support structures, beams, beams and other components. Its strength and corrosion resistance make it an ideal choice for bridge construction.
- Ship manufacturing: In some light ships or marine engineering, Q355B can be used for hull structures, slipways and other components.
- Machinery manufacturing: Suitable for construction machinery, equipment manufacturing and other fields, such as structural components of excavators, cranes, road rollers and other equipment.
- Transmission and distribution towers: Structural support elements for transmission and distribution towers that can adapt to the requirements of different environments because of their strength and corrosion resistance.
- Other applications: Including steel structural components, pipes, decorative materials and other fields. Its high strength and durability make it play an important role in engineering construction and manufacturing.
Overall, Q355B structural steel is widely used in various engineering and construction projects that require strength and durability due to its high strength, good workability and corrosion resistance.
Can Q355B steel replace steel from other countries?
First, we need to consider the following issues to achieve steel substitution:
1. Equivalence and Standard Differences:
Steel standards differ between countries and regions, including chemical composition, strength grade, and mechanical performance requirements. Q355B is a structural steel grade unique to China, and its performance parameters may differ from those of other countries. Therefore, detailed material comparison and evaluation are necessary to ensure that Q355B's performance meets the building standards of specific countries or regions.
2. Certification and Compliance:
In international construction projects, compliance with local building codes and standards is usually required. Whether Q355B steel complies with these codes and standards needs to be certified and verified. In some cases, additional testing and certification may be required to ensure compliance with local standards.
3. Supply and Cost:
Another factor to consider is the supply and cost of steel. If Q355B steel is used to replace steel from other regions, it is essential to ensure sufficient local supply and consider potential transportation costs and price differences.
4. Engineering Design and Performance Matching:
The selection of steel is usually closely related to the engineering design and required performance. If Q355B steel is used to replace steel from other regions, the structural design needs to be appropriately adjusted and verified to ensure performance matching and building safety.
In international construction projects, ensuring that the selected materials comply with local standards and regulations as well as design requirements is crucial. Therefore, steel replacement should be carried out based on a full consideration of material performance, compliance, and engineering design requirements, and should be reviewed and approved by professional engineers and relevant departments.
| Type | Q355B~Q355C~355D |
| 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. |
FAQ
Do Q355 and S355 require different welding processes?
No. Both have similar carbon equivalents and weldability. The same welding process (e.g., arc welding, gas welding) can be used for both grades, with no special adjustments needed.
Can S355 be used in Chinese projects?
Yes, as long as the project does not explicitly require GB/T standards. S355 can be used in Chinese projects if it meets the mechanical performance requirements of the design.
Is Q355 suitable for European projects?
Yes, Q355 can be used in European projects if it is certified to meet EN 10025-2 standards (equivalent to S355). Most Q355 suppliers can provide third-party certification for international projects.
What forms of Q355 and S355 steel are available?
Both grades are available in plates, coils, hot-rolled sections (H-beams, I-beams, channel steels), seamless pipes, and welded pipes, supporting customization of thickness, width, and length for various project needs.
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