Products Description
GB/T1591 Q345C,Q345C steel plate,Q345C carbon plate is similar with the steel grade S355J0 under steel standard EN 10025-2.We offer Q345C steel plate,the maximum thickness can reach till 500mm now,for the thickness above 40mm of low alloy steel plate Q345B,normally our engineers recommend doing Normalized heat treatment.
Mechnical property for Q345C low alloy structural steel
| Thickness (mm) | ||||
| Q345C | ≤ 16 | > 16 ≤ 35 | > 35 ≤ 50 | >50 |
| Yield strength (≥Mpa) | 345 | 325 | 295 | 275 |
| Tensile strength (Mpa) | 470-630 | |||
Chemical composition for Q345C low alloy structural steel
| Main chemical elements composition of Q345C | ||||||||
| C | Si | Mn | P | S | V | Nb | Ti | Al (min.) |
| 0.20 | 0.55 | 1.00-1.60 | 0.035 | 0.035 | 0.02-0.15 | 0.015-0.060 | 0.02-0.20 | 0.015 |
Applications of GB/T1591 Q345C Carbon and Low-Alloy High-Strength Steel Plate
GB/T1591 Q345C is a carbon and low-alloy high-strength structural steel plate widely used in engineering projects that require both high strength and good weldability. Its combination of toughness, plasticity, and fatigue resistance makes it suitable for various large-scale and heavy-duty construction applications.
1. Bridge Construction
Q345C steel plates are extensively used in highway and railway bridges, including girders, trusses, and bearing components.
Advantages:
High yield strength ensures structural stability under heavy loads.
Excellent toughness at sub-zero temperatures prevents brittle fracture in harsh environments.
Example: Main beams of long-span steel bridges often use Q345C with thickness ranging from 16–40mm for optimal balance between strength and weight.
2. Highway and Civil Engineering
These steel plates are ideal for overpasses, highway barriers, and structural supports.
Performance benefits:
Good fatigue resistance for components subjected to repeated traffic loads.
Excellent weldability allows rapid assembly on construction sites, reducing labor and time costs.
3. Industrial and Energy Infrastructure
Q345C steel is also suitable for industrial frameworks, storage tanks, and pressure vessels.
Advantages:
Maintains mechanical performance under varying loads and temperature fluctuations.
Resistant to minor atmospheric corrosion when used with protective coatings.
4. Maritime and Shipbuilding Applications
While not primarily a marine steel, Q345C plates can be applied in non-critical hull structures and offshore platforms where moderate corrosion resistance and high strength are required.
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