Q355B STRUCTURAL STEEL – WIND AND SOLAR STEEL
Q355B STRUCTURAL STEEL – WIND AND SOLAR STEEL
Q355B steel is a grade of structural steel widely used in construction and engineering applications. The “Q” stands for “yield strength,” indicating the steel’s ability to withstand deformation under stress. The number “355” represents the minimum yield strength of the steel, which is 355 MPa. The letter “B” indicates the quality grade, with “B” being a common designation that ensures consistent properties and good weldability. Q355B steel is known for its high strength, good plasticity, and excellent weldability, making it suitable for demanding structural applications such as buildings, bridges, and heavy machinery.
Description
What is Q355B Steel
Chemical Compositions
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.20 – 0.24 |
| Silicon (Si) | 0.55 |
| Manganese (Mn) | 1.60 |
| Phosphorus (P) | 0.030 – 0.035 |
| Sulfur (S) | 0.030 – 0.035 |
| Chromium (Cr) | 0.30 |
| Nickel (Ni) | 0.30 |
| Copper (Cu) | 0.40 |
| Nitrogen (N) | 0.012 |
Physical Properties
| Property | Value (Metric) | Value (Imperial) |
|---|---|---|
| Density | 7.85 g/cm³ | 0.284 lb/in³ |
| Melting Point | 1,510°C | 2,750°F |
| Boiling Point | N/A | N/A |
| Thermal Conductivity | 43 W/m·K | 298 BTU·in/h·ft²·°F |
| Electrical Conductivity | 6.93 MS/m | 10.0% IACS |
| Specific Heat Capacity | 486 J/kg·K | 0.116 BTU/lb·°F |
| Thermal Expansion Coefficient | 11.7 µm/m·°C | 6.5 µin/in·°F |
| Electrical Resistivity | 144 nΩ·m | 71 µΩ·in |
Mechanical Properties
| Mechanical Property | Metric Value | Imperial Value |
|---|---|---|
| Tensile Strength | 470-630 MPa | 68-91 ksi |
| Yield Strength | ≥355 MPa | ≥51.5 ksi |
| Brinell Hardness (HB) | 130-180 HB | 130-180 HB |
| Rockwell Hardness (HRC) | 20-25 HRC | 20-25 HRC |
| Vickers Hardness (HV) | 140-200 HV | 140-200 HV |
| Elongation | 20-25% | 20-25% |
| Elastic Modulus | 200 GPa | 29,000 ksi |
Industries & Applications
| Industry | Example Products |
|---|---|
| Bridges | Bridge Decks, Suspension Cables, Support Beams, Girders |
| Vehicles | Chassis Frames, Suspension Components, Reinforcement Bars, Structural Brackets |
| Ships | Hull Structures, Bulkheads, Deck Plates, Keel Sections |
| Buildings | Steel Beams, Columns, Frameworks, Reinforced Concrete Bars |
| Pressure Vessels | Oil Tanks, Pressure Cylinders, Storage Tanks, Low-Pressure Boilers |
| Cranes | Crane Booms, Load-Bearing Arms, Support Frames, Hoisting Mechanisms |
| Mining Machinery | Excavator Buckets, Crusher Components, Conveyor Belts, Drill Frames |
| Offshore Engineering | Offshore Platforms, Subsea Pipelines, Wind Turbine Foundations, Structural Tubes |
Machining
Q355B Heat Treating Instructions: Q355B steel is typically used in its as-rolled or normalized condition and does not require additional heat treatment. If needed, normalizing can be applied to refine the grain structure and improve mechanical properties.
Q355B Surface Finish: The surface of Q355B steel can be treated through methods such as painting, galvanizing, or powder coating to enhance corrosion resistance and ensure long-term durability, especially in outdoor or harsh environments.
Custom grades can be produced upon request to meet specific requirements.
Our Service
SteelPRO Group – manufacturer and solution provider for special steel, offering multi-industry application solutions and customised services, 100% quality free, accompanying customers in their growth!
Our Quality Control
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