Q500NH and Q235NH are Chinese-standard (GB/T 4171) weathering (Corten) structural steels, differentiated mainly by strength: Q235NH has a minimum yield strength of 235 MPa, while Q500NH offers a higher minimum yield strength of 500 MPa, making Q500NH a high-strength weathering steel used for demanding applications like bridges, containers, and outdoor structures where strength and corrosion resistance are crucial, whereas Q235NH is a more common, lower-strength weathering steel.
Q235NH steelchemical composition
|
Grade |
Q235NH steelchemical composition(%) |
||||
|
C Max |
Si |
Mn |
P |
S Max |
|
|
China GB/T 4171 Q235NH |
0.13 |
0.1-0.4 |
0.20-0.60 |
0.030 |
0.030 |
Q500NH steelchemical 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 |
Q235NH steelchemical composition
|
Grade |
Q235NH steelchemical composition(%) |
||||
|
C Max |
Si |
Mn |
P |
S Max |
|
|
China GB/T 4171 Q235NH |
0.13 |
0.1-0.4 |
0.20-0.60 |
0.030 |
0.030 |
Q500NH steelchemical composition
|
Grade |
Q500NH mechanical property |
||
|
Yield Strength (MPa) |
Tensile Strength (MPa) |
% Elongation min |
|
|
China GB/T 4171 Q500NH |
480-500 |
600-760 |
15 |
Key Differences & Similarities:
Strength: The number in the name (235 or 500) indicates the minimum yield strength in MPa.
Type: Both are atmospheric corrosion-resistant (weathering) structural steels, also known as Corten steel.
Standard: Both fall under China's GB/T 4171 standard.
Composition: Contain small amounts of alloying elements (like Cu, Ni, Cr) to form a protective rust layer.
Applications: Used for outdoor structures, railway cars, truck parts, and decorative elements, with Q500NH for higher load-bearing needs.
