Q415NH and Q460NH are Chinese (GB/T 4171 standard) weather-resistant (Corten-type) steel plate grades, indicating their minimum yield strength (415 MPa for Q415NH, 460 MPa for Q460NH) and "NH" for corrosion resistance, commonly used in containers, bridges, and structures needing atmospheric corrosion resistance and higher strength.
Chemical Composition of Q415NH steel plate
| Grade | C | Si | Mn | P | S | Cu | Cr | Ni |
| Q415NH | 0.12 | 0.65 | 1.1 | 0.025 | 0.03 | 0.25-0.55 | 0.30-1.25 | 0.12-0.65 |
Chemical Composition of Q460NH steel plate
|
C |
Si |
Mn |
P |
S |
Cu |
Ni |
Cr |
|
0.12 |
0.65 |
1.50 |
0.025 |
0.030 |
0.20-0.55 |
0.12-0.65 |
0.30-1.25 |
Mechanical Property of Q415NH steel plate
|
Grade |
Q415NH steel mechanical property |
||
|
Yield Strength(MPa) |
Tensile Strength(MPa) |
% Elongation min |
|
|
China GB/T 4171 Q415NH |
395-415 |
520-680 |
20 |
Mechanical Property of Q460NH steel plate
|
Thickness (mm) |
||||
|
Q460NH |
≤ 16 |
> 16 ≤ 40 |
> 40 ≤ 60 |
>60 |
|
Yield strength (≥Mpa) |
460 |
450 |
440 |
440 |
|
Tensile strength (Mpa) |
570-730 |
|||
Key Characteristics
Corrosion Resistance: Both grades are designed to develop a stable, rust-like appearance that protects the underlying steel from further corrosion (Corten steel).
Strength: The number indicates minimum yield strength: Q415NH (≥ 415 MPa) and Q460NH (≥ 460 MPa).
Applications: Building shipping containers, offshore structures, weather shelters, and bridges.
Standard: Governed by the Chinese standard GB/T 4171.
What the Designation Means
Q: Stands for "Qì" (strength), indicating the yield strength.
415 / 460: The minimum yield strength in MPa (Megapascals).
N: Denotes "Niú" (toughness) or Normalizing rolling.
H: Denotes "Hàn" (heat resistance) or Weathering Steel (Cor-Ten type).
