Product Overview
Hot Rolled Q295NH Weathering Steel Sheet is a low-alloy, high-strength structural steel conforming to the Chinese national standard GB/T 4171-2008 for welding-type weather-resistant steels.
It offers a combination of high strength, excellent weldability, and good ductility, making it ideal for structural applications in long-term outdoor exposure.
Specifications
Thickness: 1.5 – 100 mm (customizable)
Width: 1000 – 3000 mm
Length: As per customer requirement
Standard: GB/T 4171-2008
Delivery Condition: Hot Rolled, Normalized, or As Rolled
Chemical Composition
|
Element |
Content (%) |
Function |
|
C |
≤ 0.15 |
Base strength, controls toughness |
|
Si |
≤ 0.50 |
Improves strength and oxidation resistance |
|
Mn |
0.30 – 1.00 |
Enhances strength and hardenability |
|
Cu |
0.25 – 0.55 |
Promotes protective oxide layer |
|
Cr |
0.40 – 0.80 |
Improves corrosion resistance |
|
Ni |
≤ 0.65 |
Enhances atmospheric corrosion resistance |
|
P |
≤ 0.030 |
Controlled to reduce cold brittleness |
|
S |
≤ 0.030 |
Controlled to avoid hot cracking |
|
Nb, V, Ti* |
Trace additions |
Grain refinement, improved toughness |
*Optional micro-alloying for performance optimization.
Mechanical Properties
|
Property |
Specification |
|
Yield Strength (≤16 mm) |
≥ 295 MPa |
|
Tensile Strength |
430 – 560 MPa |
|
Elongation (≤16 mm) |
≥ 22% |
|
Charpy Impact Energy |
≥ 47 J (20 °C), ≥ 34 J (−20 °C) |
|
Hardness |
HRB 80 – 100 |
Manufacturing Process
Steelmaking – Converter or electric furnace smelting with precise alloy addition
Refining & Casting – Secondary refining for purity, continuous casting for uniform billets
Hot Rolling – Grain refinement and structural densification
Controlled Rolling & Normalizing – Optimized grain size and reduced residual stress
Surface Treatment – Rust removal, passivation, optional galvanizing or protective coating
Applications
Q295NH Weathering Steel is widely used in industries where long-term atmospheric exposure is unavoidable:
Bridges – Main beams, cross beams, supports with long corrosion life
Architectural Structures – Facades, roof frames, and decorative steel frameworks
Transportation – Railway car bodies, shipping containers, ship deck components
Construction Machinery – Mining equipment, cranes, and other outdoor machinery
Energy Infrastructure – Solar panel mounts, transmission towers, wind power structures
Pressure Equipment & Boilers – Where high-temperature performance is required
Advantages
Superior Atmospheric Corrosion Resistance – Protective rust layer slows corrosion rate
Reduced Maintenance Costs – Minimal painting requirements in most environments
High Structural Reliability – Maintains strength and toughness over service life
Weldability – Suitable for conventional welding methods without preheating in most cases
Versatility – Adaptable to architectural, industrial, and heavy-duty engineering projects
Procurement & Usage Recommendations
When purchasing Q295NH weathering steel sheets:
Confirm thickness, yield strength, and surface treatment according to application needs
Select reputable suppliers for consistent chemical composition and mechanical properties
Consider additional surface coating for environments with extreme humidity or salt spray exposure
Store in dry, well-ventilated areas before installation to prevent premature corrosion
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