Our Q235NH weathering steel tube is a top - notch product tailored for demanding structural applications. Adhering to the strict GB/T 4171 standard, it combines outstanding performance with a long service life.
Chemical Composition
The tube's unique corrosion - resistance comes from its well - balanced chemical makeup. Carbon content is limited to 0.13% at most, which helps maintain good weldability. Silicon (0.1 - 0.4%) and manganese (0.20 - 0.60%) enhance its strength and workability. Phosphorus and sulfur are strictly controlled below 0.030% to prevent brittleness. The addition of copper (0.25 - 0.55%), chromium (0.40 - 0.80%), and nickel (≤ 0.65%) forms a protective patina that shields the tube from atmospheric corrosion.
Mechanical Properties
It has a yield strength ranging from 215 to 235 MPa, providing reliable support for heavy loads. The tensile strength is between 360 and 510 MPa, ensuring resistance to deformation. With an elongation of at least 24%, it can endure significant bending and stretching during installation. Its excellent weldability allows for seamless joining in various construction projects.
Key Characteristics
Corrosion Resistance: Outperforms ordinary steel, with a corrosion rate 2 - 8 times lower. The self - forming patina reduces the need for frequent maintenance and painting, saving on long - term costs.
Weldability: Can be easily welded using common welding techniques, enabling quick and efficient assembly in construction sites.
Long - Life: Built to last, it can withstand harsh weather conditions, including high humidity, salt spray, and industrial pollution.
Versatility: Suitable for a wide range of shapes and sizes, meeting diverse project requirements.
FAQ
1. What is the Q235NH weathering steel tube designed for?
Answer: It is tailored for demanding structural applications, adhering to GB/T 4171 standards, and suitable for projects requiring long-term durability in harsh environments.
2. Which key alloy elements enhance its corrosion resistance?
Answer: Copper (Cu 0.25–0.55%), chromium (Cr 0.40–0.80%), and nickel (Ni ≤ 0.65%) form a protective patina layer that shields the tube from atmospheric corrosion.
3. How does the carbon content affect the tube's performance?
Answer: The carbon content is limited to ≤0.13%, maintaining good weldability and structural strength without compromising ductility during fabrication.
4. What are the mechanical properties of the Q235NH tube?
Answer:
Yield strength: 215–235 MPa (supports heavy loads)
Tensile strength: 360–510 MPa (resists deformation)
Elongation: ≥24% (enables bending/stretching during installation).
5. What are the key characteristics of the Q235NH tube?
Answer:
Corrosion resistance: Corrosion rate 2–8 times lower than ordinary steel, with self-forming patina reducing maintenance costs.
Weldability: Easily welded via common techniques for efficient construction.
Long-life performance: Withstands high humidity, salt spray, and industrial pollution.
Versatility: Available in various shapes/sizes to meet diverse project needs.
