Products Description
Q345GNH is a high-strength low-alloy atmospheric corrosion-resistant steel developed according to Chinese standard GB/T 4171. As a member of the Corten steel family, it forms a stable, protective rust layer that eliminates the need for painting under most outdoor conditions.
With a minimum yield strength of 345 MPa, Q345GNH is a reliable structural material suitable for bridges, buildings, shipping containers, urban landscapes, and steel facades. It offers good weldability, formability, and long-term corrosion resistance in variable weather environments.
Products Specification
Product Name: Weather Resistant Steel Plate
Edge: Mill Edge / Slit Edge
Width: 2000mm or as required
Thickness: 3mm-100mm or as required
Standard: AISI,ASTM,DIN,JIS,GB,JIS,SUS,EN,etc.
Technique: Hot rolled/Cold rolled
Thickness tolerance: ±0.01mm
Material: Q345GNH
Surface Treatment: Bare.
Delivery Time: Within 20-30days.
Q345GNH Chemical composition
|
Grade |
The Element Max (%) |
||||
|
Q345GNH
|
C |
Si |
Mn |
P |
S |
|
≤0.12 |
0.20-0.60 |
0.50-0.90 |
0.07-0.12 |
≤0.035 |
|
|
Cr |
Cu |
Ti |
RE |
|
|
|
|
0.25-0.50 |
≤0.03 |
≤0.15 |
|
|
Mechanical Properties
|
Property |
Specification |
|
Yield Strength |
≥ 345 MPa |
|
Tensile Strength |
470 – 630 MPa |
|
Elongation |
≥ 20% |
|
Charpy Impact Energy |
≥ 27 J (−20 °C) |
|
Hardness |
HB 130 – 180 |
Applications
Q345GNH weathering steel plates are widely used in construction, infrastructure, and industrial manufacturing, including:
Building Curtain Walls and Cladding - The natural rust patina typically forms and stabilizes within 6–12 months, with a service life of 40–80 years. It not only embodies modern architectural aesthetics but also reduces the need for periodic painting.
Roofing and Landscape Design - Offers 2–8 times greater weather resistance than ordinary carbon steel in long-term outdoor exposure, reducing maintenance costs by 30–50%.
Bridge and Structural Supports - With a yield strength ≥ 345 MPa and tensile strength of 470–630 MPa, its high load-bearing capacity makes it suitable for large-span bridges and urban elevated structures.
Transportation Equipment - Widely used in railcars, shipping containers, and truck frames, extending service life to 20–30 years and significantly reducing corrosion maintenance costs.
Industrial Equipment - Maintains service life exceeding 20 years in outdoor conditions, commonly used for machinery housings, power generation enclosures, and chemical processing units.
Public Facilities - Frequently found in urban landscape elements like sculptures, park benches, and signage. Its natural rust-colored surface requires no painting and offers durability exceeding ordinary steel by more than three times.
About Us
One-Stop Weathering Steel Solutions for Diverse Project Needs
At Gnee, we provide full-process corten steel solutions including design, fabrication, surface treatment, and global shipping. Whether you're building a facade, a garden structure, or an industrial component, we deliver with speed, quality, and flexibility.
Our service highlights:
Drawing optimization and custom design
Precision fabrication with strict quality control
Various surface finishes: pre-rusted, painted, or anti-corrosion
Export-grade packaging and reliable worldwide logistics
Full technical support before and after sales
One supplier for everything – streamlined and efficient project delivery.
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