08CuPVRE Weather Resistant Steel for Railway Rolling Stock
08CuPVRE Weather Resistant Steel Plate - TB/T 1979 Properties & Equivalent Grades Guide
Complete material data for 08CuPVRE weather resistant steel plate per China TB/T 1979 standard: chemical composition, mechanical and physical properties, international equivalents, and typical applications in railway vehicles, containers, and structural engineering.
Hot rolling, Welding, Cold forming, Bending, Shearing, Cutting
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08CuPVRE Weather Resistant Steel for Railway Rolling Stock Introduction
08CuPVRE is a high-strength, atmospheric corrosion-resistant (weathering) steel plate specified in China's railway industry standard TB/T 1979. This grade is microalloyed with copper, chromium, phosphorus, and rare earth elements to form a dense, protective oxide layer that significantly enhances resistance to atmospheric corrosion, often allowing unpainted use. It exhibits good weldability, formability, and low-temperature toughness, making it suitable for welded structures exposed to outdoor environments. Typical applications include railway wagons, containers, bridges, and building cladding. The steel is normally supplied in hot-rolled condition and can be used without protective coatings under mild atmospheric conditions.
08CuPVRE Weather Resistant Steel for Railway Rolling Stock Chemical Composition
The composition is designed to improve atmospheric corrosion resistance through additions of Cu, Cr, P, and rare earth elements (RE). Phosphorus also contributes to strength, while RE refines microstructure and enhances toughness. The carbon content is kept low to ensure good weldability.
| Element | Standard Value | Remarks |
|---|---|---|
| Carbon, C | ≤ 0.12% | Max for weldability |
| Silicon, Si | 0.20 – 0.40% | Deoxidizer |
| Manganese, Mn | 0.20 – 0.50% | Strength and toughness |
| Phosphorus, P | 0.07 – 0.12% | Improves corrosion resistance |
| Sulfur, S | ≤ 0.020% | Max limit |
| Copper, Cu | 0.25 – 0.45% | Key element for weathering resistance |
| Chromium, Cr | 0.30 – 0.65% | Enhances patina formation |
| Nickel, Ni | ≤ 0.30% | Residual tolerance |
| Vanadium, V | 0.02 – 0.08% | Grain refinement and precipitation strengthening |
| Rare Earth Elements, RE | 0.01 – 0.05% (added) | Inclusions modification, improves corrosion fatigue |
08CuPVRE Weather Resistant Steel for Railway Rolling Stock Thermal and Electrical Physical Properties
Typical physical properties for 08CuPVRE weathering steel at room temperature. Values may vary slightly depending on exact composition and heat treatment. These properties are representative for design calculations and are not part of the standard's mandatory requirements.
| Property | Typical Value | Unit | Test Condition / Notes |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | Ambient temperature |
| Modulus of Elasticity (E) | 206 | GPa | Room temperature, tension |
| Shear Modulus (G) | 80 | GPa | Room temperature, calculated |
| Poisson's Ratio (ν) | 0.3 | — | Room temperature, elastic range |
| Thermal Expansion Coefficient (α) | 11.5 | 10⁻⁶/K | 20–100 °C |
| Thermal Expansion Coefficient (α) | 12.5 | 10⁻⁶/K | 20–200 °C |
| Thermal Conductivity (λ) | 35 | W/(m·K) | At 20 °C |
| Specific Heat Capacity | 460 | J/(kg·K) | At 20 °C |
| Electrical Resistivity (ρe) | 0.25 | μΩ·m | At 20 °C |
08CuPVRE Weather Resistant Steel for Railway Rolling Stock Mechanical Properties
Mechanical properties depend on plate thickness. The steel is normally supplied in hot-rolled condition. Minimum values are guaranteed for tensile and impact properties. Impact test temperature is typically -40 °C for railway applications. Bending test is required to assess formability.
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | ≥ 355 | MPa | Thickness ≤ 16 mm |
| Yield Strength (ReH) | ≥ 345 | MPa | Thickness 16–40 mm |
| Tensile Strength (Rm) | 490 – 630 | MPa | All thicknesses |
| Elongation after fracture (A) | ≥ 22 | % | Thickness ≤ 16 mm, gauge length 50 mm |
| Elongation after fracture (A) | ≥ 21 | % | Thickness 16–40 mm, gauge length 50 mm |
| Bend Test (bend diameter) | d = 3a | — | Thickness ≤ 16 mm, 180° bending |
| Bend Test (bend diameter) | d = 4a | — | Thickness 16–40 mm, 180° bending |
| Charpy Impact Energy (KV2) | ≥ 27 @ -40 °C | J | Longitudinal specimen, 10×10 mm |
| Hardness | ≤ 180 HBW | — | For reference, not always specified |
08CuPVRE Weather Resistant Steel for Railway Rolling Stock Direct Equivalent Standards and Substitute Grade Recommendations
Direct equivalent grades are those sharing the same designation and chemical/metallurgical concept. 08CuPVRE appears in multiple Chinese standards.
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| China | TB/T 1979 | 08CuPVRE | Current railway standard |
| China | GB/T 4171-2000 (obsolete) | 08CuPVRE | Replaced by Q355GNH in GB/T 4171-2008 |
| International | No complete equivalent | — | Composition and property concept close to EN S355J2W and JIS SPA-H, but not identical |
08CuPVRE Weather Resistant Steel for Railway Rolling Stock Application Introduction
08CuPVRE is designed primarily for unpainted or minimally coated structural applications where long-term atmospheric exposure is expected. Its excellent weldability and formability allow it to be processed into complex shapes. Typical industries and products include:
Product Applications: Open-top wagons, box cars, flat cars, and hopper cars, Shipping containers and swap bodies, Welded plate girders and stiffened panels for bridges, Architectural facades, roofing, and wall panels, Transmission towers and lighting poles
Processed into products: Railway car body side sheets, end sheets, floor panels, and underframes, Container corner posts, side rails, and corrugated panels, Bridge diaphragms, web stiffeners, and bearing plates, Welded H-beams, box columns, and fabricated trusses, Bent and press-formed brackets, gussets, and mounting plates
Application industries: Railway rolling stock manufacturing, Container production (ISO containers), Bridge engineering (especially railway bridges), Building and construction (cladding, structural frames), Power transmission and telecommunications (towers, poles), Agricultural and industrial equipment housings
08CuPVRE Weather Resistant Steel for Railway Rolling Stock Similar / Alternative Material Recommendations
These grades provide comparable atmospheric corrosion resistance and mechanical properties, and are often used in similar applications. Direct substitution should be verified by detailed comparison of chemistry and mechanical values.
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10025-5 | S355J2W (1.8946) | Cu-Cr-Ni alloyed, similar strength, -20°C impact; higher Mn, lower P |
| Japan | JIS G3125 | SPA-H | High-P-Cu-Cr weathering steel, widely used for containers and railway vehicles; YS≥355 MPa depending on thickness |
| USA | ASTM A588 / A588M | Grade A | Structural weathering steel, YS≥345 MPa (≤4in.), higher Mn, lower P; suitable for bridges |
| Russia | GOST 19281-2014 | 10KhSND | Silicon-manganese-nickel-copper low-alloy steel with similar strength and corrosion resistance, used for welded structures |
Notes:
08CuPVRE develops a protective, adherent rust layer (patina) when exposed to alternating wet and dry cycles. Design considerations: avoid prolonged ponding of water; use suitable welding consumables (e.g., AWS E7018-W or equivalent) to match corrosion resistance; preheat may be required for thicker sections. The steel is typically delivered with a mill certification according to TB/T 1979, and additional testing (e.g., ultrasonic, Z-direction tensile) can be agreed upon. For painted applications, proper surface preparation is necessary to ensure coating adhesion.
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