Q235B Q355B Medium Thick Carbon Steel Plate | Hot Rolled Structural Steel Plate Supplier
Chemical Composition (Typical for Q235B & Q355B)
The Q235B has the crude composition from which we can infer that the rolling performance of Q235B is good. In contrast to Q235B, the Q355B delivers higher yield strength and better mechanical properties; thus, it is more appropriate for heavy-duty structures and severe engineering applications wherein high load-bearing and high ductility are required.
Q235B Carbon Steel Plate
| Element | Content (%) |
| Carbon (C) | ≤ 0.22 |
| Silicon (Si) | ≤ 0.35 |
| Manganese (Mn) | ≤ 1.40 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.045 |
Q355B Carbon Steel Plate
| Element | Content (%) |
| Carbon (C) | ≤ 0.24 |
| Silicon (Si) | ≤ 0.55 |
| Manganese (Mn) | ≤ 1.60 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.035 |
| Niobium (Nb) | ≤ 0.07 |
| Vanadium (V) | ≤ 0.15 |
| Titanium (Ti) | ≤ 0.20 |
Mechanical Properties (Yield Strength & Tensile Strength)
Q235B Carbon Steel Plate
Yield Strength: ≥ 235 MPa
Tensile Strength: 370 – 500 MPa
Q355B Carbon Steel Plate
Yield Strength: ≥ 355 MPa
Tensile Strength: 470 – 630 MPa
| Gauge Thickness Comparison Table | ||||
| Gauge | Mild | Aluminum | Galvanized | Stainless |
| Gauge 3 | 6.08mm | 5.83mm | 6.35mm | |
| Gauge 4 | 5.7mm | 5.19mm | 5.95mm | |
| Gauge 5 | 5.32mm | 4.62mm | 5.55mm | |
| Gauge 6 | 4.94mm | 4.11mm | 5.16mm | |
| Gauge 7 | 4.56mm | 3.67mm | 4.76mm | |
| Gauge 8 | 4.18mm | 3.26mm | 4.27mm | 4.19mm |
| Gauge 9 | 3.8mm | 2.91mm | 3.89mm | 3.97mm |
| Gauge 10 | 3.42mm | 2.59mm | 3.51mm | 3.57mm |
| Gauge 11 | 3.04mm | 2.3mm | 3.13mm | 3.18mm |
| Gauge 12 | 2.66mm | 2.05mm | 2.75mm | 2.78mm |
| Gauge 13 | 2.28mm | 1.83mm | 2.37mm | 2.38mm |
| Gauge 14 | 1.9mm | 1.63mm | 1.99mm | 1.98mm |
| Gauge 15 | 1.71mm | 1.45mm | 1.8mm | 1.78mm |
| Gauge 16 | 1.52mm | 1.29mm | 1.61mm | 1.59mm |
| Gauge 17 | 1.36mm | 1.15mm | 1.46mm | 1.43mm |
| Gauge 18 | 1.21mm | 1.02mm | 1.31mm | 1.27mm |
| Gauge 19 | 1.06mm | 0.91mm | 1.16mm | 1.11mm |
| Gauge 20 | 0.91mm | 0.81mm | 1.00mm | 0.95mm |
| Gauge 21 | 0.83mm | 0.72mm | 0.93mm | 0.87mm |
| Gauge 22 | 0.76mm | 0.64mm | 085mm | 0.79mm |
| Gauge 23 | 0.68mm | 0.57mm | 0.78mm | 1.48mm |
| Gauge 24 | 0.6mm | 0.51mm | 0.70mm | 0.64mm |
| Gauge 25 | 0.53mm | 0.45mm | 0.63mm | 0.56mm |
| Gauge 26 | 0.46mm | 0.4mm | 0.69mm | 0.47mm |
| Gauge 27 | 0.41mm | 0.36mm | 0.51mm | 0.44mm |
| Gauge 28 | 0.38mm | 0.32mm | 0.47mm | 0.40mm |
| Gauge 29 | 0.34mm | 0.29mm | 0.44mm | 0.36mm |
| Gauge 30 | 0.30mm | 0.25mm | 0.40mm | 0.32mm |
| Gauge 31 | 0.26mm | 0.23mm | 0.36mm | 0.28mm |
| Gauge 32 | 0.24mm | 0.20mm | 0.34mm | 0.26mm |
| Gauge 33 | 0.22mm | 0.18mm | 0.24mm | |
| Gauge 34 | 0.20mm | 0.16mm | 0.22mm | |
High Strength & Reliable Performance
Q235B and Q355B plates maintain stable mechanical properties with good load-bearing capacity, which can be applied in structural and industrial plates.
Good Weldability & Workability
Can be easily processed, such as cut, welded, drilled, and bent, to meet different engineering requirements with high processing efficiency and flexible processing.
Wide Application Range
Widely used in construction, bridges, machinery manufacturing, shipbuilding steel structures, and other heavy-duty projects.
Economical Material Option
Q235B is a general building material that offers more value for money; the Q355B provides increased strength for more significant applications.
Stable Chemical Composition
Stable quality and performance with long service life in any working condition.
Structural Security
In particular, Q355B plates have better impact and load resistance suitable for heavy-duty, high-stress applications.
Royal Steel Group -Q235 Q345 Carbon Steel Plate Supplier is a steel with iron as the main element and carbon content between 0.12% and 2.0%. It mainly has low carbon steel plate, medium carbon steel plate, high carbon steel plate and alloy steel plate and other different varieties. Due to its excellent properties, carbon steel plates have been widely used in industrial and civil fields.
Note:
1.Free sampling, 100% after-sales quality assurance, Support any payment method;
2.All other specifications of round carbon steel pipes are available according to your requirement (OEM&ODM)! Factory price you will get from ROYAL GROUP.
High hardness: carbon steel plate due to its high carbon content, so its hardness is much higher than ordinary steel;
Q235B & Q355B carbon steel plate as standard material
Q235B and Q355B carbon steel plates are manufactured according to the GB/T standards; the product quality is stable and the performance is reliable.
Good mechanical property
Good strength and plastic are obvious in Q235B steel for general structures; Q355B steel for heavy-duty work has much larger yield strength and good toughness.
Good weldability and formability
Each of these grades is quite easy to weld, cut, bend, and machine, which makes them great all-around choices for a variety of shop work.
Consistent Surface Quality
The mild steel plates have good surface finish, dimension accuracy, and thickness consistency, which help to carry out easy processing.
Broad range of thickness
In medium and thick plate grades, for civil engineering and general building.
Good stability of structure
The performance of load is good for building bridges, machines, steel structures, etc.
Broad Industrial Application
Used in construction machinery, shipbuilding, heavy machinery manufacturing, and general engineering work.
Transportation: Express (Sample Delivery), Air, Rail, Land, Sea shipping (FCL or LCL or Bulk)
1. What thickness range is available?
Q235B and Q355B steel plates are available in a wide range of medium and thick plate specifications, depending on project requirements.
2. Can these steel plates be customized?
Yes. We can provide customized sizes, thicknesses, cutting services, and surface processing according to customer needs.
3. How is product quality ensured?
All steel plates are produced under strict quality control and tested according to international standards to ensure stable chemical composition and reliable mechanical performance.
4. Which grade should I choose for my project?
For general structures, Q235B is sufficient. For heavy-duty, high-load, or critical engineering projects, Q355B is recommended.
5. Do you provide export packaging and shipping?
Yes. We provide standard export packaging, bundle protection, and global shipping services to ensure safe delivery to project sites worldwide.
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