GB/T 4172 Q295NH steel plate supplier

GB/T 4172 Q295NH Steel Plate

In the realm of durable construction materials, GB/T 4172 Q295NH steel plate emerges as a robust solution for welded structures that demand reliable atmospheric corrosion resistance. Conforming to the Chinese national standard GB/T 4172-2000 for atmospheric corrosion-resisting steel specifically tailored for welded applications, Q295NH excels in forming a protective patina that shields against environmental degradation. As a prominent manufacturer and exporter, Gangsteel delivers top-tier Q295NH plates, engineered for international projects where performance meets economic efficiency.

Understanding GB/T 4172 and the Q295NH Grade

GB/T 4172 focuses on low-alloy steels optimized for welding, ensuring minimal cracking risks while providing superior weathering properties. These steels are ideal for outdoor welded assemblies exposed to moisture, pollutants, and temperature fluctuations. The "Q295NH" designation reflects its minimum yield strength of 295 MPa ("Q295") and "NH" for enhanced atmospheric corrosion resistance.

This grade strikes an optimal balance between strength and cost, making it suitable for medium-load applications that require longevity without excessive material thickness. Gangsteel produces Q295NH plates adhering to the standard's latest requirements, complete with ISO certifications and detailed Mill Test Certificates (MTC).

Key Specifications

• Thickness Range: 3mm to 150mm
• Width: Up to 3,500mm
• Length: Up to 12,000mm
• Surface Finish: Hot-rolled, available in mill edge or cut edge
• Delivery Condition: As-rolled or normalized

Chemical Composition of Q295NH Steel Plate

Q295NH's alloying elements foster a tight rust layer that inhibits further corrosion, outperforming plain carbon steels in aggressive atmospheres. Standard chemical composition (per GB/T 4172) includes:

The inclusion of copper, chromium, and phosphorus is pivotal, boosting corrosion resistance by 2-4 times relative to non-alloyed steels.

Mechanical Properties and Performance

Q295NH plates provide solid mechanical attributes for welded fabrications, ensuring structural integrity under stress:

• Yield Strength: ≥ 295 MPa (up to 100mm thickness)
• Tensile Strength: 390 - 530 MPa
• Elongation: ≥ 20% (promoting good formability)
• Impact Toughness: Charpy V-notch tested for low-temperature resilience

Its low carbon equivalent (CEV ≤ 0.42) enhances weldability, supporting processes like shielded metal arc welding (SMAW) or flux-cored arc welding (FCAW) with preheating under 100°C. The weathering performance exceeds ordinary steels by a factor of 1.5-2.0, ideal for unpainted applications.

Applications of GB/T 4172 Q295NH Steel Plate

Q295NH's versatility shines in welded constructions facing real-world exposure:

• Bridges and Viaducts: Girders, barriers, and expansion joints endure de-icing salts and heavy traffic.
• Architectural Elements: Facades, railings, and decorative panels develop an attractive rust aesthetic.
• Shipping Containers: Lightweight panels resist marine corrosion during transport.
• Utility Structures: Poles, masts, and enclosures for telecom or power distribution.
• Agricultural and Industrial Equipment: Frames and hoppers in corrosive rural or factory settings.

In coastal or urban-industrial zones, Q295NH extends service life, often eliminating routine painting.

Advantages Over Conventional Steels

Choosing GB/T 4172 Q295NH steel plate yields tangible benefits:

1. Superior Weathering: Protective patina cuts corrosion by 60-80%, lowering long-term expenses.
2. Weld-Friendly: Reduced preheat needs accelerate fabrication and cut labor costs.
3. Economic Value: Higher initial strength allows thinner sections, saving material by 15-25%.
4. Eco-Conscious: Minimal coatings reduce environmental impact and waste.
5. Proven Reliability: Matches equivalents like ASTM A606 Type 2 or EN 10025-5 S295J0W in performance.

Gangsteel: Your Premier Source for Q295NH Steel Plates

With decades of expertise, Gangsteel exports GB/T 4172 Q295NH plates to discerning clients globally. Our advanced mills guarantee consistent quality, precise tolerances, and swift production. Services include:

• Tailored Orders: Custom dimensions and quantities for any scale.
• Value Pricing: Mill-direct economics for optimal margins.
• Worldwide Shipping: Robust packaging and efficient logistics by sea or air.
• Expert Assistance: Advice on welding parameters and project integration.

Reach out to us at admin@gangsteel.com or browse our site for quotes and samples.

Conclusion

GB/T 4172 Q295NH steel plateembodies efficient engineering, delivering corrosion-resistant strength for welded wonders that stand resilient. Embrace this grade to future-proof your builds against the elements. Partner with Gangsteel today—let's forge enduring solutions together!