Q355 steel plate is a high-strength structural steel plate to GB/T 1591, supplied for building structures, industrial equipment, steel fabrication and other load-bearing applications. Q355B, Q355D and Q355E grades are available in common plate sizes, with cutting and customized dimensions available according to purchasing requirements.
Q355 Steel Plate Specifications
| Item | Specification |
|---|---|
| Standard | GB/T 1591 |
| Grades | Q355B, Q355D, Q355E |
| Thickness | 6–100 mm common; thicker plates available on request |
| Width | 1,500–2,500 mm common; customized sizes available |
| Length | 6,000–12,000 mm common; customized lengths available |
| Surface | As rolled / as specified |
| Cutting | Available to required dimensions |
| Delivery Condition | As rolled, normalized or other conditions as specified |
| MTC | Available |
| MOQ | No fixed MOQ for available stock; other quantities according to purchasing requirements |
Q355 steel plate sizes can be supplied in standard dimensions or cut to the required length and width. Stock availability can be checked based on grade, thickness and quantity.
Q355 Steel Plate Grades & Properties
Q355 steel plate is commonly supplied in Q355B, Q355D and Q355E grades. The grades mainly differ in impact toughness requirements, while mechanical properties vary with plate thickness.
| Grade | Impact Test | Yield Strength* | Tensile Strength* | Elongation* |
|---|---|---|---|---|
| Q355B | +20°C | ≥355 MPa | 470–630 MPa | ≥22% |
| Q355D | −20°C | ≥355 MPa | 470–630 MPa | ≥22% |
| Q355E | −40°C | ≥355 MPa | 470–630 MPa | ≥22% |
*Typical values for Q355 plate up to 16 mm thickness. Yield strength requirements decrease with increasing thickness according to GB/T 1591.
For detailed thickness-specific requirements, see our guide to Q355 steel plate mechanical properties.
Chemical Composition
The chemical composition of Q355 steel plate is controlled according to GB/T 1591. The main elements for procurement reference are shown below.
| Element | Q355B | Q355D | Q355E |
|---|---|---|---|
| C | ≤0.24% | ≤0.20% | ≤0.20% |
| Si | ≤0.55% | ≤0.55% | ≤0.55% |
| Mn | ≤1.60% | ≤1.60% | ≤1.60% |
| P | ≤0.035% | ≤0.030% | ≤0.030% |
| S | ≤0.035% | ≤0.025% | ≤0.025% |
For complete chemical composition requirements, see our Q355 steel plate chemical composition guide.
Q355 Steel Plate Applications
Q355 structural steel plate is commonly supplied for:
- Building frames and structural supports
- Industrial buildings and workshops
- Machinery and equipment structures
- Steel fabrication and welded components
- Heavy-duty structural components
The combination of high yield strength and good structural performance makes Q355 suitable where higher-strength plate is required for fabricated and load-bearing steel structures.
Q355 Steel Plate Supply & Processing
We supply Q355 steel plate in Q355B, Q355D and Q355E, with common sizes available from stock and customized dimensions available for specific requirements.
Supply options include:
- Stock and project quantities
- Cutting to size
- Dimensional and surface inspection
- MTC documentation
- Export packing
- Sea and container shipment
For in-stock Q355 steel plate, there is no fixed MOQ. Other quantities can be discussed according to the specific purchasing requirement.
Q355 Steel Plate Packing & Delivery
Q355 plates are securely bundled and prepared for export transportation according to plate size and shipment requirements.
- Standard export packing
- Secure bundling and marking
- Suitable loading for container or bulk shipment
- Packing and documentation according to order requirements
Q355 Steel Plate Supplier
Source Q355 steel plate according to your required grade, thickness, dimensions and quantity. Stock availability, cutting, inspection, packing and shipment can be arranged based on the order requirements.
Send us your Q355 steel plate specifications and quantity to check availability and supply options.
FAQ
What grades of Q355 steel plate are available?
Q355B, Q355D and Q355E are commonly supplied grades, with selection based on the required impact toughness and project specification.
What is the standard for Q355 steel plate?
Q355 steel plate is specified under GB/T 1591.
What thickness is available for Q355 steel plate?
Common supply thicknesses are approximately 6–100 mm, with thicker plates available depending on stock and sourcing requirements.
Can Q355 steel plate be cut to size?
Yes. Q355 steel plate can be supplied in standard dimensions or cut to required sizes according to the order.
Is there a MOQ for Q355 steel plate?
There is no fixed MOQ for available stock. For non-stock requirements, quantity can be discussed according to the specific purchasing requirement.