Q235B STEEL – WIND AND SOLAR STEEL PLATE
Q235B STEEL – WIND AND SOLAR STEEL PLATE
Q235B is a grade of carbon structural steel commonly used in construction and engineering. The “Q” in Q235B stands for “yield strength,” while “235” refers to the steel’s yield strength of 235 MPa. The letter “B” indicates the quality grade, which offers improved weldability and plasticity compared to standard Q235. Q235B is hot-rolled, making it ideal for building structures, bridges, shipbuilding, and vehicle manufacturing due to its excellent mechanical properties and versatility.
Description
What is Q235B
Q235B is a variant of Q235 steel, sharing a similar composition but offering slightly enhanced properties. Like Q235, Q235B is composed of over 98% iron with small amounts of carbon, silicon, manganese, phosphorus, and sulfur. Q235B is processed through hot rolling and is known for its improved weldability, plasticity, and ductility compared to the standard Q235. Both are low-carbon steels, but Q235B is often preferred for applications requiring better performance in structural components, including buildings, bridges, shipbuilding, and vehicle manufacturing.Characteristics of Q235B Steel
Good Plasticity: Easily processed and formed, suitable for complex structural components. Excellent Weldability: Minimizes the risk of cracks during welding, making it ideal for various connection methods. Moderate Strength: Provides adequate tensile and yield strength for construction and engineering needs. Significant Ductility: Can elongate under stress without breaking, ideal for manufacturing structural parts. Versatile Applications: Widely used in construction, bridges, shipbuilding, vehicle manufacturing, and tool making.Chemical Compositions
| Element | Percentage (%) |
|---|---|
| Carbon (C) | ≤ 0.22 |
| Silicon (Si) | ≤ 0.35 |
| Manganese (Mn) | 0.30 – 0.70 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.045 |
| Iron (Fe) | Balance |
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
| Property | Metric | Imperial |
|---|---|---|
| Tensile Strength | 370-500 MPa | 53.7-72.5 ksi |
| Yield Strength | ≥235 MPa | ≥34.1 ksi |
| Brinell Hardness (HB) | 100-160 HB | 100-160 HB |
| Rockwell Hardness (HRB) | 55-80 HRB | 55-80 HRB |
| Vickers Hardness (HV) | 120-180 HV | 120-180 HV |
| Elongation | 20-26% | 20-26% |
| Elastic Modulus | 200 GPa | 29,000 ksi |
Industries & Applications
| Industry | Products |
|---|---|
| Construction | Beams, Columns, Roofing Sheets, Scaffoldings |
| Shipbuilding | Hull Plates, Bulkheads, Deck Structures, Ship Frames |
| Vehicle Manufacturing | Chassis Frames, Body Panels, Engine Mounts, Suspension Components |
| Tool Manufacturing | Cutting Tools, Molds, Dies, Measuring Instruments |
| Agriculture | Tractor Frames, Plow Blades, Irrigation Equipment, Barn Structures |
| Energy (Oil & Gas) | Pipeline Sections, Offshore Platforms, Drill Rig Components, Storage Tanks |
| Aerospace | Aircraft Frames, Landing Gear Parts, Wing Structures, Fuselage Panels |
| Heavy Machinery | Excavator Arms, Bulldozer Blades, Crane Booms, Forklift Frames |
| Railway | Train Carriage Frames, Railway Tracks, Signal Towers, Structural Support for Stations |
Machining
Q235B Heat Treating Instructions: Q235B steel is generally used in its as-rolled condition and does not require additional heat treatment. However, if needed, it can be normalized to refine its grain structure and improve its mechanical properties.
Q235B Surface Finish: The surface of Q235B steel can be treated through methods such as painting, galvanizing, or powder coating to enhance corrosion resistance and improve durability, particularly for outdoor or exposed applications.
Custom grades can be produced upon request to meet specific requirements.
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