TB/T 1979 05CuPCrNi Weathering Steel Pipe
TB/T 1979 05CuPCrNi Weathering Steel Pipe - Properties & Applications
Detailed technical data for 05CuPCrNi weathering steel pipe per Chinese standard TB/T 1979: chemical composition, mechanical and physical properties, international equivalents, and application guide.
Hot rolling, Controlled rolling, Normalizing, Welding, Cold forming
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TB/T 1979 05CuPCrNi Weathering Steel Pipe Introduction
05CuPCrNi is a low-alloy high-strength weathering steel defined in the Chinese railway industry standard TB/T 1979. Its superior atmospheric corrosion resistance is achieved through a carefully balanced addition of copper, chromium, nickel, and phosphorus. The steel forms a dense, adherent protective oxide layer when exposed to alternate wetting and drying cycles, significantly reducing maintenance requirements. It is widely used for structural components exposed to outdoor environments without protective coatings. Typical products include hot-rolled plates, strips, and welded pipes intended for railway vehicle structures, containers, and architectural applications. The material combines good formability, weldability, and economic efficiency.
TB/T 1979 05CuPCrNi Weathering Steel Pipe Chemical Composition
The chemical composition listed below conforms to TB/T 1979. The phosphorus content is intentionally increased to enhance atmospheric corrosion resistance. Trace elements are controlled to ensure welding and forming properties. All values represent the melt analysis; small variations may occur in the product.
| Element | Standard Value (wt.%) | Remarks |
|---|---|---|
| Carbon (C) | ≤0.12 | Key for weldability |
| Silicon (Si) | 0.25 – 0.75 | Deoxidizer, strength contributor |
| Manganese (Mn) | 0.20 – 0.50 | Strength and toughness |
| Phosphorus (P) | 0.06 – 0.12 | Critical for weather resistance |
| Sulfur (S) | ≤0.020 | Low content for ductility |
| Copper (Cu) | 0.25 – 0.50 | Primary patina-forming element |
| Chromium (Cr) | 0.30 – 1.25 | Enhances passivation layer |
| Nickel (Ni) | ≤0.65 | Toughness and corrosion resistance |
| Iron (Fe) | Balance | Remainder |
TB/T 1979 05CuPCrNi Weathering Steel Pipe Thermal, Electrical and Physical Properties
These physical properties represent typical values for low-alloy weathering steel and are useful for engineering calculations. They are not mandatory requirements of TB/T 1979. Values are provided for ambient and elevated temperatures where applicable. Slight variations may occur depending on the exact heat treatment and product form.
| Property | Typical Value | Unit | Test Condition / Temperature |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | 20 °C |
| Elastic modulus (E) | 206 | GPa | 20 °C typical (tension) |
| Shear modulus (G) | 80 | GPa | 20 °C estimated |
| Poisson's ratio (ν) | 0.30 | — | 20 °C elastic range |
| Thermal expansion coefficient (α) | 11.5 | 10⁻⁶ /K | 20–100 °C |
| Thermal expansion coefficient (α) | 12.2 | 10⁻⁶ /K | 20–200 °C |
| Thermal expansion coefficient (α) | 12.9 | 10⁻⁶ /K | 20–300 °C |
| Thermal conductivity (λ) | 45 | W/(m·K) | 20 °C |
| Thermal conductivity (λ) | 42 | W/(m·K) | 100 °C |
| Thermal conductivity (λ) | 39 | W/(m·K) | 200 °C |
| Thermal conductivity (λ) | 36 | W/(m·K) | 300 °C |
| Specific heat capacity (c) | 470 | J/(kg·K) | 20 °C |
| Specific heat capacity (c) | 490 | J/(kg·K) | 100 °C |
| Specific heat capacity (c) | 510 | J/(kg·K) | 200 °C |
| Specific heat capacity (c) | 540 | J/(kg·K) | 300 °C |
| Electrical resistivity (ρ_e) | 0.25 | 10⁻⁶ Ω·m | 20 °C typical |
TB/T 1979 05CuPCrNi Weathering Steel Pipe Mechanical Properties
Mechanical properties are obtained from tensile and impact tests according to TB/T 1979. The values apply to hot-rolled products in the as-delivered condition. Impact energy is measured on longitudinal Charpy V-notch specimens. Bend test demonstrates good formability without cracking.
| Property | Standard Requirement | Unit | Test Condition / Remarks |
|---|---|---|---|
| Yield strength (ReH) | ≥345 | MPa | Thickness ≤16 mm; transverse strip specimen |
| Tensile strength (Rm) | ≥480 | MPa | Room temperature |
| Elongation (A) | ≥22 | % | Gauge length 5.65√S0 |
| Bend test (180°) | d=2a (crack-free) | — | Bend diameter; a = specimen thickness; for thickness ≤16 mm |
| Bend test (180°) | d=3a (crack-free) | — | Thickness >16 mm |
| Impact energy KV₂ (-40°C) | ≥27 | J | Longitudinal Charpy V-notch; average of three specimens |
TB/T 1979 05CuPCrNi Weathering Steel Pipe Direct Equivalent Standard Grades and Substitution Possibilities
| Country/Region | Standard | Grade/Designation | Remarks |
|---|---|---|---|
| China | TB/T 1979 | 05CuPCrNi | Original standard; tube product designated 05CuPCrNi pipe |
| Japan | JIS G3125 | SPA-C | Closest chemical match; widely used internationally for similar applications |
TB/T 1979 05CuPCrNi Weathering Steel Pipe Application Introduction
05CuPCrNi weathering steel pipe is mainly applied in uncoated outdoor structures where its self-protecting rust layer provides long-term durability. With good cold formability and weldability, it is suitable for manufacturing a variety of structural and architectural components. The material is often used in the hot-rolled state or after a light protective coating application for aesthetic reasons.
Product Applications: Railway wagon bodies and underframes, ISO shipping containers and corner castings, Weathering steel facade and roofing panels, Highway guardrails and noise barriers, Sculptural and landscape structures
Processed into products: Pipe spools and hollow structural sections (HSS) for exposed frameworks, Side walls and end walls for freight wagons, Container corner posts and rails, Roof and wall purlins in unheated buildings, Support brackets and mounting bases for solar panel arrays
Application industries: Railway rolling stock manufacturing, Intermodal freight container production, Construction and architectural metalwork, Outdoor structural engineering, Art and urban furniture
TB/T 1979 05CuPCrNi Weathering Steel Pipe Near-Substitute Weathering Steel Grades
| Country/Region | Standard | Grade/Designation | Comparative Notes |
|---|---|---|---|
| USA | ASTM A588 / A588M | Grade B | Higher Mn, lower P (≤0.04); requires verification for structural equivalence |
| USA | ASTM A606 | Type 4 | Improved atmospheric corrosion resistance, but P ≤0.04 |
| Europe | EN 10025-5 | S355J0W (1.8959) | Cu-Cr based weathering steel; different P specification (≤0.035); higher yield strength after climate adjustment |
| Europe | EN 10025-5 | S355J2W (1.8965) | Similar to S355J0W but with improved low-temperature impact properties |
| China | GB/T 4171 | Q355GNH | Chinese standard for atmospheric corrosion resisting structural steel; close property range |
Notes:
Welding: Use consumables matching the weather resistance, such as AWS E80C-Ni1 or corresponding flux-cored wires. Preheat and interpass control are generally not required for thicknesses up to 30 mm. Painting: If painting is specified, the oxide layer must be completely removed by blasting. Unpainted structures require design details that avoid water traps and ensure rapid drying. Testing: TB/T 1979 requires ultrasonic or eddy current testing for pipes where applicable.
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