09CuPTiRE-A Weather Resistant Steel Plate
09CuPTiRE-A Weather Resistant Steel Plate: Composition & Performance Data
Detailed data sheet for 09CuPTiRE-A weather resistant steel plate under China TB/T 1979 standard, including chemical composition, mechanical properties, thermal and electrical properties, international equivalents, and application guidance.
Hot rolling, cold forming, welding, cutting, punching, bending
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09CuPTiRE-A Weather Resistant Steel Plate Introduction
09CuPTiRE-A is a phosphorus-copper-titanium-rare earth (RE) atmospheric corrosion resistant structural steel specified in China railway industry standard TB/T 1979. It is primarily designed for railway vehicles, containers, and building structures exposed to outdoor weathering without painting. The steel combines moderate strength with excellent resistance to atmospheric corrosion through the formation of a dense, protective oxide layer. Its composition includes copper and phosphorus to enhance corrosion resistance, titanium for grain refinement, and rare earth elements to improve overall performance. Typical applications include railway carriages, bridges, and industrial cladding. The material is usually supplied in hot-rolled condition, with good weldability and formability.
09CuPTiRE-A Weather Resistant Steel Plate Chemical Composition of 09CuPTiRE-A per TB/T 1979
The alloy design relies on Cu, P, Ti and rare earth additions for atmospheric corrosion resistance. Phosphorus (0.07–0.12%) and Copper (0.25–0.50%) are the key elements that promote the formation of a protective patina. Titanium and rare earth metals refine the microstructure and improve toughness. Sulfur and carbon are kept low to maintain weldability and formability.
| Element | Specification (wt%) | Remarks |
|---|---|---|
| C | ≤ 0.12 | Carbon content |
| Si | 0.20 – 0.40 | Silicon |
| Mn | 0.25 – 0.55 | Manganese |
| P | 0.07 – 0.12 | Phosphorus – key for corrosion resistance |
| S | ≤ 0.020 | Sulfur |
| Cu | 0.25 – 0.50 | Copper |
| Ti | ≤ 0.03 | Titanium |
| RE (added) | ≤ 0.15 | Rare earth elements (added amount) |
09CuPTiRE-A Weather Resistant Steel Plate Thermal and Electrical Physical Properties of 09CuPTiRE-A
The following physical properties are typical for low-alloy weathering steels and are suitable for engineering calculations. The density is assumed to be similar to plain carbon steel (~7.85 g/cm³). Elastic modulus and Poisson's ratio are standard for structural steels. Thermal expansion and conductivity are influenced by the copper content but remain within the range expected for this class of steel.
| Property | Typical Value | Unit | Condition / Remark |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At 20°C |
| Elastic Modulus (E) | 206 | GPa | At 20°C |
| Shear Modulus (G) | 79 | GPa | Calculated from E and ν |
| Poisson's Ratio (ν) | 0.3 | - | Typical for steel |
| Thermal Expansion Coefficient (α) | 12.0 | 10⁻⁶ /K | Between 20°C and 100°C |
| Thermal Conductivity (λ) | 45 | W/(m·K) | At 20°C, typical for low-alloy steel |
| Specific Heat Capacity | 460 | J/(kg·K) | At 20°C |
| Electrical Resistivity (ρₑ) | 0.15 | 10⁻⁶ Ω·m | At 20°C, typical |
09CuPTiRE-A Weather Resistant Steel Plate Mechanical Properties of 09CuPTiRE-A
Mechanical properties are determined on transverse test pieces according to GB/T 228. Yield strength and tensile strength vary with plate thickness. The values below are minimum requirements for hot-rolled plates. Bending tests are performed with 180° angle and specified mandrel diameter. Impact tests are not mandatory for this grade per TB/T 1979, but may be agreed upon. The material exhibits good ductility and cold formability.
| Property | Specification | Unit | Test Condition / Remark |
|---|---|---|---|
| Yield Strength (ReL) | ≥ 345 | MPa | Plate thickness ≤ 6 mm |
| Yield Strength (ReL) | ≥ 295 | MPa | Plate thickness > 6 mm |
| Tensile Strength (Rm) | ≥ 480 | MPa | Plate thickness ≤ 6 mm |
| Tensile Strength (Rm) | ≥ 440 | MPa | Plate thickness > 6 mm |
| Elongation (A) | ≥ 22 | % | Plate thickness ≤ 6 mm, gauge length 50 mm |
| Elongation (A) | ≥ 24 | % | Plate thickness > 6 mm, gauge length 50 mm |
| Bend Test (180°) | d = 2a | - | Plate thickness ≤ 6 mm, a = specimen thickness |
| Bend Test (180°) | d = 3a | - | Plate thickness > 6 mm, a = specimen thickness |
09CuPTiRE-A Weather Resistant Steel Plate Exact Equivalent Material Standards and Substitute Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| China | TB/T 1979 | 09CuPTiRE-A | Original specification |
| China | GB/T 4171 | Q345GNHL (similar) | Comparable corrosion resistant steel, but not fully identical; Q345GNHL has higher Ni and Cr. |
| USA | ASTM A588 | Grade A | Most similar in composition and weathering performance, but not exactly equivalent; often used interchangeably for structural weathering applications. |
| EU | EN 10025-5 | S355J2W | Comparable weathering steel with similar strength level; slight differences in phosphorus limitation. |
| Japan | JIS G 3125 | SPA-H (Corten-like) | High phosphorus weathering steel for structural use; close in concept but composition differs, especially in RE treatment. |
09CuPTiRE-A Weather Resistant Steel Plate Application Introduction
09CuPTiRE-A is tailored for applications where unpainted atmospheric corrosion resistance is a primary requirement. It develops a stable oxide coating that protects the base metal from further corrosion. The steel is widely used in the transportation, construction, and energy sectors.
- Excellent weldability using conventional methods (SMAW, GMAW, SAW).
- Good cold formability for bending, drawing, and roll forming.
- Suitable for long-life structures with reduced maintenance.
Product Applications: Railway car body side panels and roofs, Weatherproof shipping containers and swap bodies, Unpainted bridge girder webs and flanges, Self-weathering architectural curtain walls, Tubular steel lighting poles and antenna masts
Processed into products: Corrugated wagon side sheets, Container corrugated walls and roof panels, Bent corner posts and door headers for containers, Roll-formed highway guardrail beams, Pressed stiffener ribs for bridge decking
Application industries: Railway transportation (freight wagons, passenger coaches, locomotive panels), Container manufacturing (shipping containers, dry bulk containers), Civil engineering (highway bridges, pedestrian overpasses, road sign structures), Architecture and building (cladding, roofing, decorative facades), Power transmission (steel poles, transmission towers)
09CuPTiRE-A Weather Resistant Steel Plate Similar or Near-Equivalent Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| China | TB/T 1979 | 09CuPCrNi-A | Contains Cr and Ni for enhanced corrosion resistance; often used in same railway applications with slightly higher strength. |
| China | GB/T 4171 | Q355GNH | High-strength weathering steel with different corrosion alloying; can be considered if improved strength is needed. |
| USA | ASTM A606 | Type 4 | High-strength low-alloy weathering steel for cold-formed applications; similar corrosion resistance but different production specification. |
| India | IS 11587 | Fe 540 WA | Weathering structural steel with comparable mechanical properties; composition differs slightly. |
Notes:
- This grade is mainly supplied in hot-rolled condition and is normally used without painting; the oxide layer takes several months to fully stabilize depending on environmental conditions.
- For welding, low-hydrogen electrodes should be used to avoid cracking, especially in thicker sections.
- When cold forming at sharp radii, stress-relieving may be required to avoid strain-aging embrittlement.
- Availability is mainly in plate form with thickness up to 12 mm as per TB/T 1979; for larger thicknesses or other shapes, consult with the supplier.
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