TB/T 1979 09CuPTiRE-A Weathering Steel Pipe
09CuPTiRE-A Weathering Steel Pipe: TBT 1979 Standard Properties & Equivalents
Comprehensive material data for 09CuPTiRE-A weathering steel pipe according to TB/T 1979, including chemical composition, mechanical and physical properties, equivalent grades and application guidelines for railway and structural uses.
Hot rolling, cold forming, welding, bending, stamping, cutting
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TB/T 1979 09CuPTiRE-A Weathering Steel Pipe Introduction
09CuPTiRE-A is a copper-phosphorus-titanium-rare earth weathering steel specified in the Chinese railway industry standard TB/T 1979. It is designed for atmospheric corrosion resistance through the formation of a protective rust layer under alternate wet/dry conditions. The steel exhibits good weldability, formability and moderate strength, making it suitable for welded structures exposed to outdoor environments without painting. Typical applications include railway freight car bodies, containers and building components. The addition of rare earth elements refines grain structure and improves toughness, while copper, phosphorus and titanium enhance corrosion resistance.
TB/T 1979 09CuPTiRE-A Weathering Steel Pipe Chemical Composition
The following table lists the chemical requirements for 09CuPTiRE-A steel according to TB/T 1979. The balanced combination of Cu, P, Ti and RE provides excellent weathering resistance. All values are maximum unless a range is indicated.
| Element | Standard Value | Remarks |
|---|---|---|
| C | ≤0.12 | |
| Si | 0.20 – 0.40 | |
| Mn | 0.40 – 0.75 | |
| P | 0.07 – 0.12 | Essential for atmospheric corrosion resistance |
| S | ≤0.020 | |
| Cu | 0.25 – 0.50 | Weathering element |
| Ti | 0.03 – 0.10 | Grain refinement |
| RE (rare earth) | 0.10 – 0.20 | Added for improved toughness and formability |
TB/T 1979 09CuPTiRE-A Weathering Steel Pipe Thermal and Electrical Physical Properties
Typical physical properties for 09CuPTiRE-A weathering steel at ambient temperature. These values are not specified in the product standard but are representative for low-alloy structural steels of similar composition and density.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At 20 °C |
| Elastic modulus (E) | 206 | GPa | At 20 °C |
| Shear modulus (G) | 79.3 | GPa | Calculated from E and ν |
| Poisson's ratio (ν) | 0.3 | - | At 20 °C |
| Thermal expansion coefficient (α) | 11.1 × 10⁻⁶ | K⁻¹ | 20 – 100 °C |
| Thermal conductivity (λ) | 42 | W/(m·K) | At 20 °C |
| Specific heat capacity | 460 | J/(kg·K) | At 20 °C |
| Electrical resistivity (ρ_e) | 0.22 | µΩ·m | At 20 °C |
TB/T 1979 09CuPTiRE-A Weathering Steel Pipe Mechanical Properties
Tensile and bending properties are determined on flat specimens taken from the pipe wall or plate. The values below represent the minimum required properties for 09CuPTiRE-A in the hot-rolled or normalized condition as per TB/T 1979. Actual properties may vary with thickness and processing.
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Lower yield strength (ReL) | ≥295 | MPa | Thickness ≤16 mm, transverse |
| Lower yield strength (ReL) | ≥275 | MPa | Thickness >16 mm, transverse |
| Tensile strength (Rm) | 430 – 560 | MPa | Room temperature, transverse |
| Elongation after fracture (A) | ≥24 | % | Gauge length 5.65√S₀ (A₅) or 50 mm |
| Bend test (180°) | d = a | - | Bend diameter equal to thickness, no cracks |
TB/T 1979 09CuPTiRE-A Weathering Steel Pipe Fully Equivalent Material Standards and Recommended Replacement Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| China | GB/T 4171 | Q295GNH | New designation equivalent to 09CuPTiRE-A, identical in chemistry and properties |
| China | TB/T 1979 | 09CuPTiRE-A | Original standard grade |
TB/T 1979 09CuPTiRE-A Weathering Steel Pipe Application Introduction
09CuPTiRE-A steel pipe is widely employed in applications where both structural integrity and long-term atmospheric corrosion resistance are required. Its weldability and cold formability make it suitable for complex fabrications. It is commonly used in unpainted conditions, relying on a stable patina for protection.
Product Applications: Railway freight car bodies (side walls, roofs, floors), ISO shipping containers and swap bodies, Architectural cladding and roofing, Bridge structural tubes, Transmission poles and towers
Processed into products: Welded structural pipes and hollow sections, Roll-formed profiles (C, Z, U channels), Bent and stamped panels, Laser-cut and drilled parts, Welded frames and support brackets
Application industries: Railway transportation, Container manufacturing, Building and construction, Power transmission, Agricultural machinery
TB/T 1979 09CuPTiRE-A Weathering Steel Pipe Similar / Comparable Alternative Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| China | TB/T 1979 | 09CuPCrNi-A | Higher strength weather-resistant steel (ReL ≥345 MPa), contains Cr and Ni |
| China | GB/T 4171 | Q355GNH | Higher strength grade (ReL ≥355 MPa), may require design adjustments |
| Japan | JIS G3125 | SPA-H | Typical high-phosphorus weathering steel, similar corrosion resistance but different phosphor level |
| USA | ASTM A606 | Type 4 | High-strength low-alloy weathering steel, close mechanical properties |
Notes:
- Weathering index: The steel is required to have an atmospheric corrosion resistance index I ≥ 6.0 when calculated according to the standard formula.
- Surface condition: Steel may be supplied with a slight surface oxidized layer; pickling or shot blasting can be specified.
- Welding considerations: Low heat input welding procedures are recommended; matching weathering steel filler metals should be used for exposed joints to maintain corrosion parity.
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