Q355NH and Q460NH are Chinese standard (GB/T) weathering steels, indicating they develop a protective rust layer for atmospheric corrosion resistance, with the 'NH' denoting weldable structural weathering steel; the key difference is strength, as Q355NH offers a minimum yield strength around 355 MPa, while Q460NH provides higher strength, typically around 460 MPa, making Q460NH suitable for heavier structural applications like bridges, towers, and vehicles needing enhanced strength and durability.
Mechnical property for Q355NH corten plate
| Thickness (mm) | ||||
| Q355NH | ≤ 16 | > 16 ≤ 40 | > 40 ≤ 60 | >60 |
| Yield strength (≥Mpa) | 355 | 345 | 335 | 325 |
| Tensile strength (Mpa) | 490-630 | |||
Mechnical property for Q460NH corten plate
|
Grade |
Q460NH steel mechanical property |
||
|
|
Yield Strength(MPa) |
Tensile Strength(MPa) |
% Elongation min |
|
Q460NH |
440-460 |
570-730 |
19 |
Chemical composition for Q355NH corten plate
| Main chemical elements composition of Q355NH steel plate | |||||||
| C | Si | Mn | P | S | Cu | Ni | Cr |
| 0.16 | 0.50 | 0.50-1.50 | 0.030 | 0.030 | 0.25-0.55 | 0.65 | 0.40-0.80 |
Chemical composition for Q460NH corten plate
|
Grade |
Q460NH steel chemical composition(%) |
||||
|
C Max |
Si Max |
Mn Max |
P Max |
S Max |
|
|
Q460NH |
0.12 |
0.65 |
1.5 |
0.025 |
0.030 |
Key Characteristics
Weathering: Both form a stable, protective rust layer (patina) that slows further corrosion, eliminating the need for painting.
Strength: '355' and '460' refer to their minimum yield strength in megapascals (MPa).
Weldability: The 'N' signifies normal/normalized state, and 'H' denotes weldability, making them suitable for welded structures.
Applications: Used in architecture, bridges, containers, and vehicles where aesthetic and functional longevity are important.
