08CuPVRE Weathering Steel Pipe
08CuPVRE Weathering Steel Pipe: High-Strength Corrosion Resistance for Railway and Container Engineering
Detailed material data of 08CuPVRE weathering steel pipe under China railway standard TB/T 1979, including chemical composition, mechanical properties, thermal properties, and equivalent grades.
Hot rolling, normalizing, cold bending, welding, punching, shearing
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08CuPVRE Weathering Steel Pipe Introduction
08CuPVRE is a phosphorus-copper-vanadium-rare earth alloyed weathering steel developed specifically for railway vehicles and containers under the Chinese standard TB/T 1979. By adding an optimum combination of Cu, P, V and RE (rare earth metals), the steel forms a dense, adherent protective rust layer after exposure to the atmosphere, which significantly retards further corrosion and eliminates the need for painting in many service environments. Key characteristics include:
- Minimum yield strength of 235 MPa and tensile strength ≥400 MPa, offering good load-bearing capacity.
- Superior atmospheric corrosion resistance, typically 2–4 times that of ordinary carbon steel.
- Excellent formability and weldability, suitable for cold bending, roll forming and common welding processes using matching weather-resistant filler metals.
- Delivered in as-rolled or normalized condition, mainly in the form of hot-rolled plates, sheets, strips, pipes, and sections.
The grade is widely used in the manufacture of railway wagon body panels, shipping containers, highway guardrails, and structural components exposed to outdoor environments.
08CuPVRE Weathering Steel Pipe Chemical Composition
The chemical composition of 08CuPVRE is precisely defined in TB/T 1979 to ensure consistent atmospheric corrosion resistance. The combination of Cu and P promotes the formation of a protective patina, while V refines grain size and RE elements improve inclusion morphology and corrosion uniformity.
| Element | Standard Value (wt%) | Remarks |
|---|---|---|
| Carbon (C) | ≤0.12 | |
| Silicon (Si) | 0.20–0.40 | |
| Manganese (Mn) | 0.20–0.50 | |
| Phosphorus (P) | 0.070–0.12 | Alloying element for weather resistance |
| Sulfur (S) | ≤0.020 | |
| Copper (Cu) | 0.25–0.45 | Primary alloy for atmospheric corrosion resistance |
| Vanadium (V) | 0.02–0.08 | Microalloy for strength and grain refinement |
| Rare Earth (RE) | 0.10–0.20 (added amount) | Added as mischmetal; improves deoxidation and sulfide shape control |
08CuPVRE Weathering Steel Pipe Thermal and Electrical Physical Properties
Physical properties are typical for this type of low-alloy weathering steel and are not mandatory in the steel standard. They are provided for engineering calculations and design purposes.
| Property | Typical Value | Unit | Test Condition / Reference |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At room temperature |
| Modulus of elasticity (E) | 206 | GPa | At room temperature |
| Shear modulus (G) | 79.3 | GPa | Calculated from E and ν |
| Poisson's ratio (ν) | 0.30 | At room temperature | |
| Thermal expansion coefficient (α) | 12.0 | 10⁻⁶/K | Between 20°C and 100°C |
| Thermal conductivity (λ) | 52 | W/(m·K) | At 100°C |
| Specific heat capacity | 460 | J/(kg·K) | At room temperature |
| Electrical resistivity (ρ_e) | 0.13 | µΩ·m | At room temperature |
08CuPVRE Weathering Steel Pipe Mechanical Properties
Mechanical properties are determined on longitudinal test pieces taken from hot-rolled products. The values meet the minimum requirements of TB/T 1979. For thickness ranges, cold bend tests and impact energies are specified. Actual properties may slightly exceed the minima.
| Property | Required Value | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | ≥235 | MPa | Thickness ≤6 mm, transverse |
| Tensile Strength (Rm) | ≥400 | MPa | Thickness ≤6 mm, transverse |
| Elongation after fracture (A) | ≥24 | % | Gauge length 50 mm, thickness ≤6 mm |
| Yield Strength (ReH) | ≥235 | MPa | Thickness >6–12 mm, transverse |
| Tensile Strength (Rm) | ≥400 | MPa | Thickness >6–12 mm, transverse |
| Elongation after fracture (A) | ≥24 | % | Gauge length 50 mm, thickness >6–12 mm |
| Cold bending (180°) | d = a (no cracking) | Thickness ≤6 mm, a = specimen thickness | |
| Cold bending (180°) | d = 2a (no cracking) | Thickness >6–12 mm | |
| Charpy impact energy (KV2) | ≥47 | J | Room temperature, V-notch, 10×10×55 mm specimen |
08CuPVRE Weathering Steel Pipe Fully Equivalent Material Standards and Replaceable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| China | TB/T 1979 | 08CuPVRE | Original standard and grade; no identical international equivalent exists due to unique V-RE addition |
08CuPVRE Weathering Steel Pipe Application Introduction
08CuPVRE weathering steel is primarily designed for thin-gauge, cold-formed components in the railway and container industries. Its unique chemistry allows it to be used in an unpainted state after the formation of a stable, protective rust layer. Key application sectors and products include:
Product Applications: Railway wagon sides, ends and roof panels, Dry cargo shipping containers (side walls, doors), Corten architectural panels and rain screens, Highway guardrail beams and posts
Processed into products: Bent and roll-formed side walls, end walls, and door panels for wagons, Corrugated container panels (side, roof, front), Stamped bracket, gussets and small structural brackets, Pipe sections for conveying mildly corrosive media, Cold-formed channels, angles, and Z-profiles
Application industries: Railway vehicle manufacturing (freight wagons, passenger cars), Container and intermodal equipment production, Highway and infrastructure engineering (guardrails, bridge non-structural parts), Architectural cladding and industrial roofing, Transmission & telecommunication towers
08CuPVRE Weathering Steel Pipe Similar/Alternative Materials with Comparable Performance
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| China | GB/T 4171 | Q355NH (formerly Q345GNHL) | Similar mechanical properties and general weather resistance, but without RE and V additions; can be used for structures not requiring RE benefits. |
| Japan | JIS G3125 | SPA-H | Popular high-phosphorus weathering steel for containers; contains Cu-Cr-Ni, no V or RE. Corrosion resistance similar, but tensile strength min. 490 MPa, check formability. |
| USA | ASTM A588/A588M | Grade A / B | High-strength low-alloy weathering steel with Cu, Cr, Ni, V (Grade B); matches tensile and yield requirement, suitable for structural applications without RE. |
| Europe | EN 10025-5 | S235J2W (+N) | General structural weathering steel with Cu, P, Cr, Ni; yield ≥235 MPa, without rare earth, may require evaluation for specific railway applications. |
Notes:
When welding 08CuPVRE, use matching weather-resistant consumables (e.g., AWS A5.1 E7018-W1 or equivalent with Cu and Ni) to ensure weld metal corrosion resistance matches that of the base metal. Preheating is not generally required for thicknesses up to 12 mm. The material can be cut and sheared with normal shop tools. For long-term outdoor exposure without paint, the design must allow proper wet-dry cycling to form the protective patina; avoid stagnant water pockets. The RE addition enhances longitudinal toughness and helps desulfurization, but it also requires careful steelmaking practice to achieve consistent recovery.
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