Steel used to build railway and road bridges. It is required to have high strength and sufficient toughness, low notch sensitivity, good low temperature toughness, anti-aging sensitivity, fatigue resistance and welding performance.
For steel structures: in the early days of the founding of the People's Republic of China, steel was in short supply. In order to ensure the construction of the national economy, steel was given priority to supply key industrial fields, including bridges. However, the amount of steel used in general industrial and civil buildings is very small. At that time, in order to build the Wuhan Yangtze River Bridge, the high-strength steel at that time, 16Mnq, was specially developed, which is equivalent to the current Q345.
The steel grade in bridges is generally above Q345. In addition, the bridge is subjected to dynamic load, so the impact toughness and fatigue performance of the steel will be very high.
GBT 1591 Q345C low alloy high strength steel plates are widely used in buildings, bridges, vehicles, ships, pressure vessels and so on. Q represents the yield strength of Q345C material. The latter 345 refers to the yield value of Q345C material, which is about 345 MPa. The yield value will decrease with the increase of the bmaterial thickness.
GBT 1591 Q345C low alloy high strength steel plates chemical composition and mechanical property:
|
Grade |
C % |
Si % |
Mn |
P % |
S % |
|
|
Q345C |
≤ 0.20 |
≤ 0.55 |
1.00-1.60 |
≤ 0.035 |
≤0.035 |
|
|
Grade |
Thickness |
Yield Strength (Mpa) |
Tensile Strength |
Elongation |
Impact Energy |
|
(mm) |
(MPa) |
(%) |
Min |
|
Q345C |
≤ 16 |
345 |
470-630 |
22 |
0 |
34J |
|
|
>16-35 |
325 |
470-630 |
22 |
0 |
34J |
|
|
>35 |
295 |
470-630 |
22 |
0 |
34J |
|
The min impact energy is longitudinal energy |
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