TB/T 1979 05CuPCrNi Weather Resistant Steel Coil
TB/T 1979 05CuPCrNi Weather Resistant Steel Coil - Properties & Equivalents
In-depth material data for 05CuPCrNi weather resistant steel coil per China railway standard TB/T 1979, including chemical composition, mechanical and physical properties, international equivalents, and application guide.
Hot rolling, cold rolling, forming, welding
- Phone : +8618037372205
- Email : [email protected]
- WhatsApp: Contact via Whtsapp
- WeChat: +8618037372205
TB/T 1979 05CuPCrNi Weather Resistant Steel Coil Introduction
05CuPCrNi is a low-alloy weathering steel grade specified in the Chinese railway standard TB/T 1979, designed for excellent atmospheric corrosion resistance. It contains copper, chromium, and nickel, which form a stable, protective oxide layer under cyclic wet/dry conditions, eliminating the need for painting in many applications. This steel is primarily supplied as hot-rolled coil or sheet and is widely used in railway rolling stock, shipping containers, and architectural structures. Key features include moderate strength (min. yield 275 MPa), good formability, and reliable toughness at ambient temperatures. The material can be welded, cut, and formed using conventional methods.
TB/T 1979 05CuPCrNi Weather Resistant Steel Coil Chemical Composition
Chemical requirements as per TB/T 1979 for 05CuPCrNi weathering steel (ladle analysis). Phosphorus is intentionally added to enhance corrosion resistance, while copper, chromium, and nickel promote the formation of a protective patina. The low carbon content ensures good weldability.
| Element | Standard Value (%) | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.12 | Ladle analysis |
| Silicon (Si) | 0.20 – 0.75 | Deoxidizer and strength contributor |
| Manganese (Mn) | 0.20 – 0.50 | Improves hardenability |
| Phosphorus (P) | 0.07 – 0.15 | Key element for weathering resistance |
| Sulfur (S) | ≤ 0.040 | Generally kept low |
| Copper (Cu) | 0.25 – 0.55 | Enhances atmospheric corrosion resistance |
| Chromium (Cr) | 0.30 – 1.25 | Forms stable oxide layer |
| Nickel (Ni) | ≤ 0.65 | Improves toughness and corrosion resistance |
TB/T 1979 05CuPCrNi Weather Resistant Steel Coil Physical Properties
Typical physical data for low-alloy weathering steel. These values are not part of the TB/T 1979 mandatory requirements but are commonly observed for 05CuPCrNi steel at room temperature unless stated otherwise. They are useful for design calculations.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | 20 °C |
| Modulus of Elasticity (E) | 206 | GPa | 20 °C |
| Shear Modulus (G) | 81 | GPa | 20 °C (calculated from E and ν) |
| Poisson's Ratio (ν) | 0.30 | – | 20 °C |
| Thermal Expansion Coeff. (α) | 12.0 × 10⁻⁶ | K⁻¹ | 20 – 100 °C |
| Thermal Conductivity (λ) | 42 | W/(m·K) | 100 °C |
| Specific Heat Capacity (Cp) | 460 | J/(kg·K) | 20 °C |
| Electrical Resistivity (ρe) | 0.20 | μΩ·m | 20 °C |
TB/T 1979 05CuPCrNi Weather Resistant Steel Coil Mechanical Properties
Minimum guaranteed mechanical properties according to TB/T 1979 (applicable to as-rolled condition, thickness ≤ 6 mm). For thicker material, reduced elongation limits may apply. Bending test is performed at room temperature with a mandrel diameter equal to the specimen thickness (d = a).
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | ≥ 275 | MPa | t ≤ 6 mm, transverse |
| Tensile Strength (Rm) | ≥ 410 | MPa | t ≤ 6 mm, transverse |
| Elongation (A) | ≥ 27 | % | t ≤ 6 mm, gauge length 50 mm |
| Bend Test (180°) | d = a (no cracks) | – | t ≤ 6 mm, ambient temperature |
TB/T 1979 05CuPCrNi Weather Resistant Steel Coil Fully Equivalent Material Standards and Substitution Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G3125 | SPA-H | Identical chemical composition and mechanical requirements; widely used for weathering steel sheet/coil. |
TB/T 1979 05CuPCrNi Weather Resistant Steel Coil Application Introduction
05CuPCrNi is optimized for uncoated atmospheric exposure. Its self-protecting patina develops over time, reducing maintenance. It can be used directly in many structural and transportation applications. The steel is formable and weldable with standard procedures; preheating is generally not required for thicknesses below 15 mm.
Product Applications: Railway wagons (coal gondola cars, box cars), Shipping containers (corner posts, side panels), Weather-exposed architectural panels, Steel bridges and footbridges, Utility poles and transmission towers
Processed into products: Railcar side walls, end sheets, floor plates, Container corner castings and frame members, Bridge deck plates and stiffeners, Façade cladding panels and sunshades, Profiled sheets for roofing and siding
Application industries: Railway rolling stock manufacturing, Container fabrication, Architectural & construction (cladding, bridges, sculptures), Agricultural machinery, Energy & transmission towers
TB/T 1979 05CuPCrNi Weather Resistant Steel Coil Similar Alternative Materials
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| China | TB/T 1979 | 09CuPCrNi-A | Higher carbon (≤0.12%), similar corrosion resistance; slightly higher strength. |
| USA | ASTM A242 / A606 | Type 1 / Corten A | Closest ASTM designation; minor differences in P and Cr ranges. |
| Europe | EN 10025-5 | S355J0WP | Comparable weathering steel with similar Cu-Cr-Ni system; yield strength 355 MPa. |
Notes:
Welding: Use low-hydrogen electrodes (E7018 or equivalent) or GMAW with matching weathering steel consumables. Forming: Minimum bend radius of 2t recommended for thickness > 6 mm. Corrosion: In marine or high-acidity environments, a protective coating may still be required. The patina formation is sensitive to frequent immersion or prolonged wetness.
- Share
