09CuPCrNi-A Weather Resistant Steel Plate
09CuPCrNi-A Weather Resistant Steel Plate | TB/T 1979 | Railway Vehicle Material
Comprehensive data sheet for 09CuPCrNi-A weather resistant steel plate under China TB/T 1979 standard: chemical composition, mechanical properties, thermal and electrical properties, equivalent grades, and application guide.
Hot rolling, cold forming, welding, cutting, and machining.
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09CuPCrNi-A Weather Resistant Steel Plate Introduction
09CuPCrNi-A is a weather-resistant structural steel specified in the Chinese railway industry standard TB/T 1979. It belongs to the low-alloy high-strength atmospheric corrosion-resistant steel family, designed to form a stable, protective rust layer under alternate wet and dry conditions, eliminating the need for painting in many environments. The steel offers excellent corrosion resistance, good welding performance, and reliable low-temperature toughness.
Key characteristics include:
- Enhanced resistance to atmospheric corrosion through the addition of copper, chromium, and nickel.
- Minimum yield strength ranging from 295 to 345 MPa depending on plate thickness.
- Excellent formability and weldability for fabrication of railway freight cars, containers, and structural components.
- Guaranteed impact energy at -40°C, ensuring safe service in cold climates.
09CuPCrNi-A Weather Resistant Steel Plate Chemical Composition
The chemical composition of 09CuPCrNi-A is designed to provide excellent atmospheric corrosion resistance. Copper, chromium, and nickel are the key alloying elements that promote the formation of a dense, adherent oxide layer. Phosphorus also contributes to corrosion resistance but is kept within a controlled range to maintain toughness. The low carbon content ensures good weldability.
| Element | Standard Value (%) | Notes |
|---|---|---|
| C (Carbon) | ≤ 0.12 | Max |
| Si (Silicon) | 0.20 – 0.50 | - |
| Mn (Manganese) | 0.30 – 0.70 | - |
| P (Phosphorus) | 0.07 – 0.12 | - |
| S (Sulfur) | ≤ 0.020 | Max |
| Cu (Copper) | 0.25 – 0.50 | - |
| Cr (Chromium) | 0.30 – 1.00 | - |
| Ni (Nickel) | ≤ 0.45 | Max |
09CuPCrNi-A Weather Resistant Steel Plate Thermal and Electrical Physical Properties
The following physical property data represent typical values for this type of weathering steel and are not mandated by TB/T 1979. Actual values may vary slightly depending on production conditions and temperature.
| Property | Typical Value | Unit | Test Condition / Comments |
|---|---|---|---|
| Density (ρ) | 7.85 | kg/dm³ | at 20°C |
| Modulus of Elasticity (E) | 207 | GPa | at 20°C, tensile modulus |
| Shear Modulus (G) | 80 | GPa | at 20°C, typical value |
| Poisson's Ratio (ν) | 0.29 | - | at 20°C |
| Thermal Expansion Coefficient (α) | 11.8 | 10⁻⁶/K | between 20°C and 100°C |
| Thermal Expansion Coefficient (α) | 12.8 | 10⁻⁶/K | between 20°C and 300°C |
| Thermal Conductivity (λ) | 43 | W/(m·K) | at 20°C |
| Specific Heat Capacity | 480 | J/(kg·K) | at 20°C |
| Electrical Resistivity (ρ_e) | 0.25 | Ω·mm²/m | at 20°C |
09CuPCrNi-A Weather Resistant Steel Plate Mechanical Properties
Mechanical properties are determined on transverse test pieces in the as-delivered condition. Yield strength, tensile strength, elongation, and impact toughness are guaranteed. The values vary with plate thickness. Bending tests shall be free from cracks. Impact test temperature is -40°C unless otherwise agreed.
| Property | Standard Required Value | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH / Rp0.2) | ≥ 345 | MPa | thickness ≤ 6 mm |
| Yield Strength (ReH / Rp0.2) | ≥ 325 | MPa | thickness > 6 to ≤ 12 mm |
| Yield Strength (ReH / Rp0.2) | ≥ 310 | MPa | thickness > 12 to ≤ 16 mm |
| Yield Strength (ReH / Rp0.2) | ≥ 295 | MPa | thickness > 16 to ≤ 40 mm |
| Tensile Strength (Rm) | ≥ 480 | MPa | thickness ≤ 6 mm |
| Tensile Strength (Rm) | ≥ 470 | MPa | thickness > 6 to ≤ 12 mm |
| Tensile Strength (Rm) | ≥ 465 | MPa | thickness > 12 to ≤ 16 mm |
| Tensile Strength (Rm) | ≥ 460 | MPa | thickness > 16 to ≤ 40 mm |
| Elongation after fracture (A) | ≥ 22 | % | thickness ≤ 6 mm, gauge length 50 mm |
| Elongation after fracture (A) | ≥ 24 | % | thickness > 6 to ≤ 16 mm, gauge length 50 mm |
| Elongation after fracture (A) | ≥ 25 | % | thickness > 16 to ≤ 40 mm, gauge length 50 mm |
| Bend Test (180°) | d = a | - | thickness ≤ 6 mm, d=diameter of mandrel, a=specimen thickness |
| Bend Test (180°) | d = 1.5a | - | thickness > 6 to ≤ 16 mm |
| Impact Energy (KV, longitudinal) | ≥ 27 | J | -40°C |
09CuPCrNi-A Weather Resistant Steel Plate Completely Equivalent Material Standards and Substitutable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G3125 | SPA-H | Chemical composition and mechanical properties closely match 09CuPCrNi-A. Widely used in containers and rolling stock. |
| Europe | EN 10025-5 | S355J2WP | P- and Cu-alloyed improved atmospheric corrosion resistance steel; impact guaranteed at -20°C (J2) or -20°C for J0. Close equivalent. |
| China | GB/T 4171 | Q355GNH | Same base composition, but slightly different mechanical property breakdown. Interchangeable for many structural applications. |
09CuPCrNi-A Weather Resistant Steel Plate Application Introduction
09CuPCrNi-A is tailored for applications exposed to outdoor atmospheric conditions where maintenance-free service life is desired. Its self-protecting patina eliminates the need for painting in many non-marine environments.
- Excellent weldability using all common methods (SMAW, SAW, GMAW) with matching or low-alloy fillers.
- Good cold formability for rolling, bending, and pressing operations.
- Superior corrosion fatigue resistance in rail and bridge applications.
Product Applications: Railway freight cars (side walls, roofs, underframes), Open-top containers and ISO containers, Steel bridges (girders, stiffeners), Wind turbine towers (lower cost coastal alternative), Sculptures and architectural cladding, Poles and masts
Processed into products: Frame and body panels of railway wagons, Container corner fittings and cross members, Bridge expansion joints, Transmission tower legs and gusset plates, Roll-formed purlins and cladding profiles, Exhaust stacks and ductwork
Application industries: Railway and mass transit, Container manufacturing, Bridge and highway infrastructure, Power transmission towers, Architecture and building facades, Agricultural machinery and silos
09CuPCrNi-A Weather Resistant Steel Plate Similar / Near Equivalent Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A588 | Grade A | High-strength low-alloy structural steel with enhanced atmospheric corrosion resistance. Similar service properties but different composition (higher Mn, lower P). |
| China | GB/T 4171 | Q345GNHL | Weathering steel with added Cr, Ni, Cu, and P. Suitable for welded structures where toughness is required. |
| Europe | EN 10025-5 | S355J0WP | Atmospheric corrosion resistant steel with impact energy at 0°C. Can substitute when lower temperature toughness is not critical. |
| India | IS 11587 | Fe 490 W (WR 490 C) | Weathering steel for structural purposes, broadly comparable in strength and corrosion resistance. |
Notes:
- Welding consumables should be selected to match the corrosion resistance of the base metal; ER55-G or ER80S-G type wires and E55-type electrodes are common.
- For low-temperature service, normalization or controlled rolling may be specified to ensure impact properties.
- The protective patina develops best under alternate wet/dry cycling; continuous immersion or severe marine environments may require additional protection.
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