Q355NH weather resistant steel adds a small amount of alloying elements such as Cu, P, Cr, Ni, etc. to form a protective layer on the surface of the metal substrate to improve the atmospheric corrosion resistance of Q355NH steel.
Composition of Q355NH steel (%)
C |
Si |
Mn |
P |
S |
Cu |
Cr |
Ni |
|
≤0.16 |
≤0.50 |
0.50-1.50 |
≤0.030 |
≤0.030 |
0.25-0.55 |
0.40-0.80 |
≤0.65 |
Mechanical properties of Q355NH steel
|
Grade |
Tensile requirement |
|
Yield strength MPa min. |
Tensile strength MPa |
Elongation A% min. |
|
≤16 |
16-40 |
40-60 |
＞60 |
≤16 |
16-40 |
40-60 |
＞60 |
|
Q355NH |
355 |
345 |
335 |
325 |
490-630 |
22 |
22 |
21 |
20 |
Impact performance of steel Q355NH
Quality level |
V-notch impact test |
|
Sample direction |
Temperature ℃ |
Impact absorption energy J |
|
A |
Vertical |
— |
— |
|
B |
20 |
≥47 |
|
C |
0 |
≥34 |
|
D |
-20 |
≥34 |
|
E |
-40 |
≥27 |
Q355NH steel belongs to welded weathering steel, which is widely used in vehicles, bridges, containers, buildings or other structural parts. Compared with high weathering steel, it has better welding performance.
