Q355NHB is a high-strength low-alloy weathering steel compliant with GB/T 4171-2008, renowned for its outstanding atmospheric corrosion resistance, robust mechanical properties and versatile processability. As a cost-effective engineering material, it forms a dense, stable protective rust layer after short-term outdoor exposure, enabling bare use without painting and slashing long-term maintenance costs by 40-60%. With a minimum yield strength of 355 MPa, tensile strength of 470-630 MPa and 20℃ impact energy ≥47 J, it balances high load-bearing capacity and reliable toughness, outperforming ordinary carbon steel and traditional weathering steel in structural stability.
Key Advantages of Q355NHB Weathering Steel
Excellent Atmospheric Corrosion Resistance
Compared with ordinary carbon structural steel, Q355NHB offers:
- 2–8 times higher resistance to atmospheric corrosion
- Reduced rust penetration over long-term exposure
- Significantly longer service life in outdoor environments
This makes Q355NHB an ideal choice for unpainted or lightly coated steel structures.
Reliable Mechanical Properties
Q355NHB provides an excellent balance between strength and toughness:
- Yield strength: ≥ 355 MPa
- Tensile strength: 470–630 MPa
- Good elongation and ductility
These properties ensure structural safety under static and dynamic loads.
Good Weldability and Fabrication Performance
Q355NHB weathering steel plate performs well in:
- Welding (with matching weathering steel consumables)
- Flame, plasma, and laser cutting
- Cold bending and forming
This allows efficient fabrication without complex processing requirements.
Lower Life-Cycle Cost
Thanks to its corrosion-resistant characteristics, Q355NHB:
- Reduces or eliminates the need for painting
- Lowers maintenance and repainting costs
- Improves overall project economic efficiency
It is a cost-effective solution for long-term infrastructure projects.
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 |
Common Applications of Q355NHB Weathering Steel
Due to its excellent performance, Q355NHB weathering steel is widely used in:
- Bridge structures and girders
- Railway wagons and freight cars
- Shipping containers and container frames
- Steel towers and transmission structures
- Architectural exposed steel facades
- Industrial platforms and outdoor frameworks
It is especially suitable for urban, industrial, and coastal environments with moderate atmospheric corrosion.
GNEE Steel, a leading supplier with 18 years of export experience, offers Q355NHB weathering steel plates in various specifications (1.5mm-60mm thickness, custom cut-to-size available) with hot-rolled, controlled rolling, normalized and HRP (hot rolled pickled) delivery states.
Backed by strategic partnerships with top steel mills, 25,000+ tons of spot stock across 7 national warehouses and 7-day fast delivery for spot orders, we provide one-stop solutions including rust acceleration treatment, project-specific certifications and 24/7 technical support.
Our Q355NHB products are exported to 50+ countries, holding ISO9001, SGS, TUV and BV certifications, making us your reliable global partner for high-quality weathering steel solutions.
Inquire Now for Competitive Quotes & Free Technical Datasheets
Email: alloy@gneesteelgroup.com
WhatsApp/WeChat: +86-15824687445
Official Website: chinaalloyplates.com
Q: Can Q355NHB be used in bridge construction, building steel frames, or railway freight cars?
A: Yes, Q355NHB is widely used in bridge construction, building steel frames, railway freight cars, and other fields due to its comprehensive performance.
Q: What is the difference between Q355NHB and Q355NHA/Q355NHC?
A: The main difference lies in impact toughness levels (A < B < C); choose Q355NHB for general low-temperature requirements, and NHC for harsher cold environments.
Q: What is the current market price of Q355NHB?
A: As of 2026, the market price of Q355NHB ranges from 3950 to 4100 RMB/ton, varying with raw material costs and order quantity.
Q: How long is the delivery time for Q355NHB?
A: The delivery time for spot Q355NHB is usually within 7 days, while customized production delivery time depends on the order requirements.
Q: Which manufacturers supply high-quality Q355NHB?
A: High-quality Q355NHB is supplied by large steel mills such as Baosteel, Ansteel, and Maanshan Iron & Steel.
