Products Description
Q355GNH straight seam welded steel pipe is a high-strength low-alloy structural steel welded pipe widely used in construction, bridges, machinery manufacturing, and other fields, with excellent mechanical properties and welding properties.
As one of the important types, Q355GNH straight seam welded steel pipe occupies an important position in the market with its stable quality and reliable performance.
GB/T4171 Q355GNH weathering steel pipe Chemical Composition
|
Grade |
C |
Si |
Mn |
P | S | Cu | Cr | Ni |
|
Q355GNH |
≤0.12 |
0.20-0.75 |
≤1.00 |
0.07-0.15 | ≤0.020 | 0.25-0.55 | 0.30-1.25 | ≤0.65 |
GB/T4171 Q355GNH weathering steel pipe Mechanical Property
| Grade | Yieldstrength(MPa), min, for T in mm | Tensilestrength(Mpa) | ,Elongation(%) | ||||||
| Q355GNH | ≤16 | >16,≤40 | >40,≤60 | >60 | 490-630 | ≤16 | >16,≤40 | >40,≤60 | >60 |
| 355 | 345 | - | - | 22 | 22 | - | - | ||
Products Application
Q355GNH weathering steel refers to a low-alloy structural steel with a protective rust layer resistant to atmospheric corrosion. Q355GNH steel can be used to manufacture steel structures such as vehicles, bridges, towers, and containers.
Compared with plain carbon steel, weathering steel has better corrosion resistance in the atmosphere - tests show that its corrosion rate is 5–8 times lower and its service life is 2–4 times longer than ordinary carbon steel under outdoor exposure conditions.
Q355GNH weathering steel is widely used in transportation, architecture, energy, and industrial manufacturing. In bridge construction, it is ideal for welded structures, truss bridges, and railway overpasses, offering a maintenance-free surface for over 50 years under normal conditions.
In the building industry, Q355GNH steel is commonly used for curtain walls, façade panels, canopies, and decorative structures, providing a natural rustic appearance that evolves with time.
In transportation and logistics, it is used in container fabrication, truck bodies, and railway carriages, where the improved corrosion resistance reduces repainting and maintenance costs by up to 40%.
For power and communication infrastructure, Q355GNH is also applied in transmission towers, telecommunication masts, and wind turbine supports, ensuring long-term structural stability in outdoor environments.
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