Q310GNH and Q265GNH are Chinese standard (GB/T 4171) low-alloy weathering (Corten) steel plates, known for their excellent atmospheric corrosion resistance, forming a stable rust-like appearance to eliminate painting, with Q310GNH offering higher strength (around 310 MPa yield) than Q265GNH (around 265 MPa yield). They're used in construction, bridges, containers, and vehicles, providing high strength, toughness, and durability with reduced maintenance.
Chemical composition of Q265GNH steel plate
|
Grade |
Q265GNH steel chemical composition(%) |
||||
|
C Max |
Si |
Mn |
P |
S Max |
|
|
China GB/T 4171 Q265GNH |
0.12 |
0.1-0.4 |
0.2-0.5 |
0.07-0.12 |
0.02 |
Chemical composition of Q310GNH steel plate
|
Grade |
Q310GNH steel chemical composition(%) |
||||
|
C Max |
Si |
Mn |
P |
S Max |
|
|
China GB/T 4171 Q310GNH |
0.12 |
0.25-0.75 |
0.2-0.5 |
0.07-0.12 |
0.02 |
Mechanical property of Q265GNH steel plate
|
Grade |
Q265GNH steel mechanical property |
|
|
|
Yield Strength(MPa) min |
Tensile Strength(MPa) min |
% Elongation min |
|
|
China GB/T 4171 Q265GNH |
265 |
410 |
-- |
Mechanical property of Q310GNH steel plate
|
Grade |
Q310GNH steel mechanical property |
|
|
|
Yield Strength(MPa) min |
Tensile Strength(MPa) min |
% Elongation min |
|
|
China GB/T 4171 Q310GNH |
310 |
450 |
-- |
Key Characteristics & Differences
Standard: Both fall under the GB/T 4171 standard for weathering steel.
Grade Designation: The number indicates the minimum yield strength (e.g., Q310 has a minimum yield of 310 MPa, Q265 has ~265 MPa).
Strength: Q310GNH is stronger than Q265GNH, making it suitable for higher stress applications.
Composition: Both are low-alloy steels containing elements like copper (Cu), chromium (Cr), and nickel (Ni) for corrosion resistance.
Appearance: Develop a protective, aesthetically pleasing rust patina over time.
Applications
Structural Engineering: Buildings, bridges, towers, and construction.
Transportation: Vehicles, railways, and containers.
Industrial: Oil derricks, platforms, and machinery.
