GB/T700 Q275 structural carbon steel plates steel plate for bridge

GB/T700 Q275 China structural carbon steel plates have high strength, good plasticity and cutting properties, and have welding performance. For those reasons, Q275 steel plates are widely used in bridge engineering to make more important mechanical components, and can be used to replace high quality carbon steel sometimes.

GB/T700 Q275 China structural carbon steel plates chemical composition:

GB/T700 Q275 China structural carbon steel plates mechanical property

1. Structural Girders and Main Load-Bearing Components
Q275 steel plate is widely used in bridge girders, main beams, and primary load-bearing components due to its yield strength of ≥275 MPa and tensile strength of 410–560 MPa.

The steel's elongation of 23% or more provides excellent ductility, allowing it to withstand heavy vehicle loads, dynamic stresses, and environmental effects such as wind and temperature changes.

Its good weldability and formability enable precise fabrication and assembly of complex bridge structures.

2. Deck Plates, Reinforcements, and Secondary Structures
In addition to main girders, Q275 plates are also used for bridge deck plates, cross beams, and reinforcement elements, where durability and toughness are essential.

The steel's consistent mechanical properties and hot-rolled thickness tolerance of ±5% ensure stable performance over long service life. With excellent resistance to fatigue and deformation, Q275 steel plates contribute to safe, durable, and low-maintenance bridge construction.