Q295GNHJ Weather Resistant Steel Coil for Containers
Q295GNHJ Weather Resistant Steel Coil for Containers | GB/T 18982-2003 Grade
Comprehensive material data of Q295GNHJ container weathering steel conforming to GB/T 18982-2003, including chemical composition, mechanical properties, physical properties and international equivalent comparisons.
Hot rolling, cold forming, welding, cutting, bending
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Q295GNHJ Weather Resistant Steel Coil for Containers Introduction
Q295GNHJ is a high-strength low-alloy weathering steel specifically designed for container manufacturing under Chinese standard GB/T 18982-2003. It belongs to the corrosion-resistant structural steel family, with typical additions of copper, chromium, and phosphorus to achieve enhanced atmospheric corrosion resistance. The steel exhibits a minimum yield strength of 295 MPa and tensile strength in the range of 390 – 520 MPa, combined with good formability and weldability. Its self-protecting oxide layer eliminates the need for painting in many environments, reducing maintenance costs. This grade is delivered primarily in hot-rolled coils, sheets or plates and is used for side panels, roof sheets and structural frames of dry cargo containers. The steel can be processed by cutting, bending, roll forming and welding.
Q295GNHJ Weather Resistant Steel Coil for Containers Chemical Composition
Chemical composition according to GB/T 18982-2003 – ladle analysis. The steel is micro-alloyed with copper, chromium and phosphorus to improve corrosion resistance. Grain-refining elements such as Nb, V or Ti may be added at the manufacturer's discretion.
| Element | Specified Value | Remarks |
|---|---|---|
| C | ≤ 0.12 | Carbon |
| Si | 0.25 – 0.75 | Silicon |
| Mn | 0.20 – 0.50 | Manganese |
| P | ≤ 0.12 | Phosphorus (enhances weathering) |
| S | ≤ 0.020 | Sulphur |
| Cu | 0.25 – 0.45 | Copper |
| Cr | 0.30 – 0.65 | Chromium |
| Ni | ≤ 0.25 | Nickel |
Q295GNHJ Weather Resistant Steel Coil for Containers Thermal and Electrical Physical Properties
Typical physical data for low-alloy weathering steel at room temperature and elevated temperature. These values are not part of the mandatory standard but are representative for Q295GNHJ class material. Actual values may vary slightly depending on exact composition and processing route.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | 20 °C |
| Modulus of Elasticity (E) | 200 | GPa | 20 °C |
| Shear Modulus (G) | 80 | GPa | Calculated, 20 °C |
| Poisson's Ratio (ν) | 0.30 | – | Elastic range, 20 °C |
| Thermal Expansion Coefficient (α) | 12.0 | ×10⁻⁶/ K | 20 – 100 °C |
| Thermal Conductivity (λ) | 50 | W/(m·K) | 20 °C |
| Specific Heat Capacity | 460 | J/(kg·K) | 20 °C |
| Electrical Resistivity (ρₑ) | 0.25 | ×10⁻⁶ Ω·m | 20 °C |
Q295GNHJ Weather Resistant Steel Coil for Containers Mechanical Properties
Tensile and bend properties at room temperature as required by GB/T 18982-2003. Values depend on nominal thickness. Test specimens are taken transverse to the rolling direction unless otherwise agreed.
| Property | Minimum / Range | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | ≥ 295 | MPa | Ambient temperature |
| Tensile Strength (Rm) | 390 – 520 | MPa | Ambient temperature |
| Elongation (A) | ≥ 24 | % | Thickness ≤ 6 mm, gauge length 50 mm |
| Elongation (A) | ≥ 27 | % | Thickness > 6 mm, gauge length 50 mm |
| Bend Test (Mandrel Diameter) | 2a (180°) | – | No cracks on bent surface, a = specimen thickness |
Q295GNHJ Weather Resistant Steel Coil for Containers Exact Equivalent Material Standards and Substitute Grades
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| China | GB/T 18982-2003 | Q295GNHJ | Original specification; fully compliant substitute |
Q295GNHJ Weather Resistant Steel Coil for Containers Application Introduction
Q295GNHJ is primarily used in the container industry and in structural applications where enhanced atmospheric corrosion resistance is beneficial. It can be formed and welded by conventional methods.
Product Applications: Dry cargo containers (ISO standard), Offshore container cabins, Prefabricated building modules, Weather-exposed steel frames
Processed into products: Container side wall panels, Container roof sheets, Container corner posts and rails, Door frames, Floor support cross members
Application industries: Container manufacturing, Marine transportation equipment, Architectural cladding, Railway vehicle components, Steel structure engineering
Q295GNHJ Weather Resistant Steel Coil for Containers Similar / Proximate Alternative Materials
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G 3125 | SPA-H | Similar weathering concept; yield 345 MPa typical |
| EU | EN 10025-5 | S235J2W | Lower strength (235 MPa min); similar corrosion resistance |
| EU | EN 10025-5 | S355J2W | Higher strength (355 MPa min); comparable weathering properties |
| USA | ASTM A588 | Grade A | Yield 345 MPa; contains higher Mn and Cr |
| China | GB/T 4171 | Q295GNH | General structural weathering steel; not optimized for containers |
Notes:
The steel develops a tightly adhering oxide layer that protects against further atmospheric corrosion. Surface treatments such as shot blasting and shop priming can be applied if immediate painting is required. Welding consumables matching the weathering steel's composition are recommended (e.g., AWS E7018-W1). Consult the standard for detailed tolerances on dimensions and shape.
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