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
Compared with ordinary carbon structural steel, Q355NHB offers:
- 2–8 times higher resistance to atmospheric corrosion
- Reduced rust penetration over long-term exposure
This makes Q355NHB an ideal choice for unpainted or lightly coated steel structures.
Q355NHB provides an excellent balance between strength and toughness:
- Yield strength: >= 355 MPa
- Tensile strength: 470–630 MPa
These properties ensure structural safety under static and dynamic loads.
Q355NHB weathering steel plate performs well in:
This allows efficient fabrication without complex processing requirements.
Lower Life-Cycle Cost
Thanks to its corrosion-resistant characteristics, Q355NHB:
It is a cost-effective solution for long-term infrastructure projects.
Q355NHB Weathering Steel Chemic Weathering Steel
| C(％) | Max 0.16 |
| Max 0.50 | |
| 0.90-1.50 | |
| P(％) | 0.035 |
| S(％) | 0.035 |
| 0.40-0.80 | |
| V(%) | 0.02-0.10 |
| 0.20-0.50 |
Common Applications of Q355NHB Weathering Steel
Due to its excellent performance, Q355NHB weathering steel is widely used in:
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.
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.
