09CuPCrNi-A Weathering Steel Pipe
09CuPCrNi-A Weathering Steel Pipe: Comprehensive Data Sheet & Equivalents
Detailed technical data for 09CuPCrNi-A weathering steel pipe under TB/T 1979 standard. Includes chemical composition, mechanical properties, physical properties, international equivalents, and application guidance for railway and structural use.
Hot rolling, cold forming, welding (all common methods), machining, cutting, bending, and drilling. Suitable for manufacturing processes requiring good ductility.
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09CuPCrNi-A Weathering Steel Pipe Introduction
09CuPCrNi-A is a high-strength low-alloy (HSLA) weathering steel originally developed for the Chinese railway industry under the standard TB/T 1979. Its enhanced atmospheric corrosion resistance is achieved through a carefully balanced addition of copper, chromium, and nickel, which promotes the formation of a dense, protective oxide layer (patina) that slows further corrosion. This steel offers excellent weldability, good cold formability, and reliable toughness even at low temperatures. It is predominantly supplied in the form of hot-rolled plates, sheets, strips, and welded pipes, and is widely used in the fabrication of railway freight cars, passenger coaches, shipping containers, bridges, and architectural structures. The typical delivery condition is hot-rolled or normalized, ensuring consistent mechanical properties and ease of fabrication.
09CuPCrNi-A Weathering Steel Pipe Chemical Composition
The chemical composition of 09CuPCrNi-A is strictly controlled according to TB/T 1979 to ensure consistent weathering performance and mechanical strength. The combination of Cu, Cr, and Ni, along with a deliberate phosphorus addition, enhances the formation of a stable protective rust layer. Residual elements are kept low to maintain weldability and toughness.
| Chemical Element | Standard Value (wt%) | Remarks |
|---|---|---|
| Carbon (C) | ≤0.12 | - |
| Silicon (Si) | 0.20–0.40 | - |
| Manganese (Mn) | 0.20–0.50 | - |
| Phosphorus (P) | 0.07–0.12 | Key element for patina formation |
| Sulfur (S) | ≤0.020 | - |
| Copper (Cu) | 0.25–0.45 | Weathering element |
| Chromium (Cr) | 0.30–0.60 | Weathering element |
| Nickel (Ni) | 0.12–0.40 | Improves toughness and patina stability |
| Iron (Fe) | Balance | Approximately 97.5–98.5% |
09CuPCrNi-A Weathering Steel Pipe Thermal and Electrical Physical Properties
The physical properties listed below are typical for 09CuPCrNi-A weathering steel at room temperature unless otherwise specified. These values are not mandatory by the standard but provide guidance for thermal and structural calculations. Properties are similar to those of mild carbon steels with slightly higher resistivity due to the alloying elements.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | 20°C |
| Modulus of Elasticity (E) | 206 | GPa | Room temperature |
| Shear Modulus (G) | 79.3 | GPa | Room temperature |
| Poisson's Ratio (ν) | 0.30 | - | Room temperature |
| Coefficient of Thermal Expansion (α) | 12.0 × 10⁻⁶ | 1/K | 20–100°C |
| Thermal Conductivity (λ) | 45 | W/(m·K) | 20°C |
| Specific Heat Capacity (cp) | 460 | J/(kg·K) | 20°C |
| Electrical Resistivity (ρ_e) | 0.20 × 10⁻⁶ | Ω·m | 20°C |
09CuPCrNi-A Weathering Steel Pipe Mechanical Properties
The following mechanical properties are guaranteed for 09CuPCrNi-A steel in the delivery condition (hot-rolled or normalized) according to TB/T 1979. Values refer to flat products with thickness ≤6 mm. The steel exhibits a good combination of high strength, ductility, and low-temperature toughness, making it suitable for demanding structural applications.
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | ≥345 | MPa | Thickness ≤6 mm, transverse |
| Tensile Strength (Rm) | ≥480 | MPa | Thickness ≤6 mm |
| Elongation after Fracture (A) | ≥22 | % | Gauge length 50 mm, thickness ≤6 mm |
| Bend Test (Mandrel Diameter) | d = 2a (180° bending), no cracks | - | a = specimen thickness |
| Charpy V-Notch Impact Energy (KV2) | ≥27 | J | -40°C, longitudinal specimen |
09CuPCrNi-A Weathering Steel Pipe Fully Equivalent Material Standards and Substitutable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| China | TB/T 1979 | 09CuPCrNi-A | Original specification |
| Japan | JIS G3125 | SPA-H | Widely used equivalent for hot-rolled weathering steel; similar corrosion resistance and mechanical properties |
| USA | ASTM A588/A588M | Grade A | Structural weathering steel; comparable composition with higher manganese tolerance; used interchangeably in many designs |
| Europe | EN 10025-5 | S355J2W+N | Close match in strength and weathering performance; delivery condition normalized |
| International | ISO 4952 | Fe510W | International standard for weathering structural steel; compatible with 09CuPCrNi-A chemistry and strength range |
09CuPCrNi-A Weathering Steel Pipe Application Introduction
09CuPCrNi-A steel is engineered for applications where long-term atmospheric corrosion resistance is required without protective coatings. The stable rust-like appearance (patina) eliminates the need for painting in many environments, reducing lifecycle costs. Its excellent weldability and formability allow fabrication of complex shapes, and its good low-temperature toughness ensures safety in cold climates. Typical applications span transportation, construction, and industrial equipment.
Product Applications: Railway freight cars (gondolas, hoppers, boxcars), Passenger coach bodies and underframes, ISO shipping containers and swap bodies, Steel bridge deck plates and girders, Weathering steel sculptures and cladding
Processed into products: Side panels and roof sheets for railway wagons, Container corner posts and rails, Bridge bearing plates and expansion joints, Flue gas stacks and industrial ducting, Structural brackets and support beams
Application industries: Railway transportation (freight and passenger), Shipping container manufacturing, Bridge engineering (especially in corrosive environments), Architectural and structural steelwork (facades, canopies), Industrial equipment and chimneys
09CuPCrNi-A Weathering Steel Pipe Recommendations for Similar/ Alternative Materials
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| China | GB/T 4171 | Q355NH | Chinese structural weathering steel; similar strength but slightly different alloy design; often used in buildings and bridges |
| USA | ASTM A242 | Type 1 | High-strength low-alloy structural steel with improved atmospheric corrosion resistance; about 2x copper content compared to 09CuPCrNi-A |
| Japan | JIS G3125 | SPA-C | Cold-rolled counterpart of SPA-H; used for thinner gauge applications such as containers |
| Europe | EN 10025-5 | S355J0W | Lower toughness variant (0°C Charpy) of S355J2W; can replace if low-temperature impact requirements are less critical |
| Worldwide | Proprietary | COR-TEN A | Trade mark of U.S. Steel; original atmospheric corrosion resistant steel; falls within similar composition and property envelope |
Notes:
For welded structures, it is recommended to use matching weathering steel welding consumables to maintain uniform corrosion resistance. Preheating is generally not required for thicknesses below 30 mm under normal conditions, but low-hydrogen practices should be followed. The protective patina develops optimally when the surface undergoes alternate wetting and drying cycles; full colour stabilization may take 1–3 years. 09CuPCrNi-A is not intended for use in submerged or continuously wet environments without supplementary protection.
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