Q355NHB Corten Steel Sheet is a high-strength, low-alloy weathering steel (Corten) known for its excellent atmospheric corrosion resistance, forming a protective rust-like layer, with 'Q' for yield strength, '355' for its minimum 355MPa yield strength, 'NH' for weather resistance, and 'B' for its grade, commonly used in containers, bridges, and architectural structures due to its self-protecting, low-maintenance nature.
Material Type: A type of weathering steel, falling between ordinary steel and stainless steel, with added elements like copper, nickel, and chromium for enhanced corrosion resistance.
Q355NHB Weathering Steel Chemic Weathering Steel
| Element | Data |
| C(％) | Max 0.16 |
| Si(％) | Max 0.50 |
| Mn(％) | 0.90-1.50 |
| P(％) | 0.035 |
| S(％) | 0.035 |
| Cr(％) | 0.40-0.80 |
| V(%) | 0.02-0.10 |
| Cu(%) | 0.20-0.50 |
Q355NHB Corten Steel Material Mechanical properties
| Properties | Data |
| Yield Rp0.2 (MPa) |
745 (≥) |
| Tensile Rm (MPa) |
333 (≥) |
| Impact KV/Ku (J) |
11 |
| Elongation A (%) |
23 |
| Reduction in cross section on fracture Z (%) |
24 |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 242 |
Key Features & Core Advantages
1. Superior Weather Resistance (Corten-Like Performance)
Q355NHB forms a dense, stable protective rust layer (α-FeOOH) within 6-12 months of outdoor exposure, effectively blocking moisture, oxygen, and harmful ions. Its corrosion rate (0.02-0.04 mm/year in industrial/coastal environments) is 2-8 times lower than ordinary carbon steel, enabling "bare use" without painting-reducing maintenance costs by 30-50% over the service life.
2. High Strength & Mechanical Stability
With a minimum yield strength of 355 MPa and tensile strength of 470-630 MPa, it outperforms standard Corten A (yield strength ≥235 MPa) in load-bearing capacity. Excellent ductility (elongation ≥21%) and impact toughness (≥47 J at 20℃) ensure suitability for complex forming and low-temperature applications (optional -20℃ impact testing).
3. Cost-Effective & Eco-Friendly
Compared to stainless steel and imported Corten steel, Q355NHB offers a 20-40% lower price point while maintaining equivalent weather resistance. Its "no-paint" design reduces VOC emissions, aligning with global green construction and sustainable engineering trends.
4. Versatile Processability
Ideal for welding (carbon equivalent ≤0.42%), cutting (laser, plasma, shear), bending, and rolling. No post-weld heat treatment is required for most applications, simplifying on-site construction and shortening project cycles.
Typical Applications
Q355NHB Corten steel sheet is trusted in global engineering projects, including:
Building & Architecture: Curtain walls, roofs, steel frames, and outdoor sculptures (e.g., stadiums, airport terminals)
Bridge & Infrastructure: Overpasses, railway bridges, transmission towers, and highway guardrails
Transportation Equipment: Railway freight cars, subway platform canopies, and port crane structures
Outdoor & Coastal Projects: Coastal defense engineering, port facilities, and offshore platform components (resists salt spray corrosion)
Heavy Machinery: Mining equipment frames, industrial crane arms, and agricultural machinery parts
FAQ
Q: Is Q355NHB equivalent to Corten A/B?
A: It has similar weather resistance to Corten A/B but higher strength; direct replacement for most non-extreme environment projects.
Q: Can it be used in coastal areas?
A: Yes, its Cu-Cr-Ni alloy composition ensures excellent salt spray corrosion resistance-widely used in coastal bridges and port facilities.
Q: How is the weldability of Q355NHB?
A: Q355NHB has good weldability with low cold crack sensitivity, suitable for manual arc welding, submerged arc welding, and gas metal arc welding.
Q: Is Q355NHB easy to bend, punch, or roll?
A: Q355NHB has good ductility, is easy to bend, punch, and roll, and will not crack under proper processing conditions.
If you want to learn more about GNEE's products, you can send an email to alloy@gneesteelgroup.com. We are more than happy to assist you.
