Q500NH and Q415NH are grades of high-strength, low-alloy (HSLA) weathering steel plates, primarily used in construction, bridges, and other outdoor structures, known for their enhanced corrosion resistance due to copper, phosphorus, and other elements, with the numbers indicating minimum yield strength (e.g., Q500NH offers around 500 MPa yield strength), conforming to Chinese standard GB/T 4171, often supplied as sheets or plates.
Q415NH steel plate Chemical composition
|
C |
Si |
Mn |
P |
S |
Cu |
Cr |
Ni |
|
0.12 |
0.65 |
1.10 |
0.025 |
0.03 |
0.20-0.55 |
0.30-1.25 |
0.12-0.65 |
Q500NH steel plate Chemical composition
|
Grade |
Q500NH chemical composition(%) |
||||
|
C Max |
Si Max |
Mn Max |
P Max |
S Max |
|
|
China GB/T 4171 Q500NH |
0.12 |
0.65 |
2.0 |
0.025 |
0.030 |
Q415NH steel plate Mechanical properties
|
Grade |
Q415NH steel mechanical property |
||
|
Yield Strength(MPa) |
Tensile Strength(MPa) |
% Elongation min |
|
|
China GB/T 4171 Q415NH |
395-415 |
520-680 |
20 |
Q500NH steel plate Mechanical properties
|
Grade |
Q500NH mechanical property |
||
|
Yield Strength (MPa) |
Tensile Strength (MPa) |
% Elongation min |
|
|
China GB/T 4171 Q500NH |
480-500 |
600-760 |
15 |
Key Characteristics
Type: Weathering Steel (Corten-like).
Standard: GB/T 4171 (Chinese national standard for weathering steel).
Strength: High strength, with 'Q' meaning Yield Strength, and the number indicating the minimum yield strength in megapascals (MPa) (e.g., 415 MPa for Q415NH, 500 MPa for Q500NH).
'NH' Designation: Indicates weather resistance, meaning it forms a protective rust layer (patina) over time, reducing further corrosion.
Applications: Building construction, bridges, infrastructure, and other applications needing durability in exposed environments.
