Products Description
GB/T1591 Q345D is a low-alloy, high-strength carbon steel plate widely used in construction, bridges, vehicles, and structural engineering. Compared to Q345C, Q345D offers improved toughness and plasticity, especially at low temperatures, making it suitable for applications in harsh or cold environments.
Products Specification
Standard: GB/T8162
Dimension: Out Diameter: 114mm-914mm
Wall Thickness: 4mm-40mm
GB/T1591 Q345D Carbon Steel Plate Chemical Composition and Mechanical Property
| Grade | C % | Si % | Mn | P % | S % | |
| Q345D | ≤ 0.18 | ≤ 0.55 | 1.00-1.60 | ≤ 0.030 | ≤ 0.030 | |
| Grade | Thickness | Yield Strength (Mpa) | Tensile Strength | Elongation | Min Impact Energy | |
| (mm) | (MPa) | (%) | ||||
| Q345D | ≤16 | 345 | 470-630 | 22 | -20 | 34J |
| >16-35 | 325 | 470-630 | 22 | -20 | 34J | |
| >35 | 295 | 470-630 | 22 | -20 | 34J | |
| The min impact energy is longitudinal energy | ||||||
Products Application
Q345D steel plate is a manufacturing steel for general structural applications. It is typically available in thicknesses ranging from 3 to 50 mm, widths from 1000 to 2000 mm, and lengths from 2000 to 8000 mm.
Q345D steel plate exhibits a yield strength of 325–345 MPa, a tensile strength of 470–630 MPa, and an elongation of 19–21%, providing sufficient toughness and ductility for general-purpose use.
Q345D steel plate is mainly used for sheet metal, light structural elements of household goods, and similar applications where it is not required as a major load-bearing structural component, but still benefits from good weldability and formability. Its carbon content is ≤0.20%, manganese 1.0–1.6%, and silicon 0.20–0.50%, ensuring consistent mechanical performance while maintaining ease of processing.
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