09CuPTiRE-B Weathering Steel Pipe
09CuPTiRE-B Weathering Steel Pipe | TB/T 1979 Material Data & Equivalents
Complete material analysis for 09CuPTiRE-B weathering steel pipe per Chinese railway standard TB/T 1979, including chemistry, mechanics, thermal properties, international equivalents and applications.
Hot rolling, cold bending, welding, cutting, punching
- Phone : +8618037372205
- Email : [email protected]
- WhatsApp: Contact via Whtsapp
- WeChat: +8618037372205
09CuPTiRE-B Weathering Steel Pipe Introduction
09CuPTiRE-B is a low-alloy atmospheric corrosion-resistant steel (weathering steel) defined by the Chinese railway standard TB/T 1979. This grade contains copper, phosphorus, titanium, and rare earth (RE) additions to develop a protective rust layer that significantly improves corrosion resistance in outdoor environments. It offers a minimum yield strength of 295 MPa and tensile strength in the range of 410–550 MPa, with good ductility and formability. Typical delivery condition is hot-rolled or normalized. The material is predominantly used for structural components of railway rolling stock, containers, and various unpainted steel structures. Its self-healing oxide patina reduces maintenance costs and extends service life.
- Key features: enhanced atmospheric corrosion resistance, good weldability, adequate toughness
- Available forms: plate, strip, and welded pipe
- Processing: hot rolling, cold bending, welding, shearing
09CuPTiRE-B Weathering Steel Pipe Chemical Composition
The composition of 09CuPTiRE-B is precisely specified by TB/T 1979 to balance corrosion resistance and mechanical properties. Copper and phosphorus act synergistically to form a dense protective oxide, while titanium and rare earth additions refine grain and improve toughness. RE (rare earth) is usually added as a Ce/La mixture. Sulfur is tightly controlled to avoid hot shortness.
| Element | Standard Value (%) | Remarks |
|---|---|---|
| C | ≤ 0.12 | |
| Si | 0.20 – 0.40 | |
| Mn | 0.25 – 0.55 | |
| P | 0.07 – 0.12 | Key corrosion-resistant element |
| S | ≤ 0.020 | |
| Cu | 0.25 – 0.45 | Atmospheric corrosion resistance |
| Ti | 0.03 – 0.10 | Grain refinement |
| RE (rare earth) | 0.10 – 0.25 (added) | Typical Ce/La mixture; actual residual may vary |
09CuPTiRE-B Weathering Steel Pipe Thermal and Electrical Physical Properties
Physical properties are typical for low-alloy weathering steel and are not part of the TB/T 1979 standard. They are provided as design guidelines. Actual values may vary slightly with processing and heat treatment. These data are based on published technical references for similar Cu-P-Ti-RE steels.
| Property | Typical Value | Unit | Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | 20 °C |
| Elastic Modulus (E) | 206 | GPa | 20 °C |
| Shear Modulus (G) | 79.3 | GPa | Estimated from E and ν |
| Poisson's Ratio (ν) | 0.3 | – | 20 °C |
| Thermal Expansion Coefficient (α) | 12.2 × 10⁻⁶ | /K | 20 – 100 °C |
| Thermal Conductivity (λ) | 45 | W/(m·K) | 20 °C |
| Specific Heat Capacity (c) | 460 | J/(kg·K) | 20 °C |
| Electrical Resistivity (ρ_e) | 0.22 | µΩ·m | 20 °C |
09CuPTiRE-B Weathering Steel Pipe Mechanical Properties
Mechanical property requirements according to TB/T 1979 for hot-rolled plate/strip (transverse test specimens). Values are valid for the delivery condition. Bend test requirement is 180° with diameter equal to specimen thickness, without cracks. Elongation values depend on product thickness. No Charpy impact requirement is mandated by the standard, but typical impact energy at room temperature exceeds 27 J.
| Property | Standard Value | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | ≥ 295 | MPa | Room temperature, thickness ≤ 16 mm |
| Tensile Strength (Rm) | 410 – 550 | MPa | Room temperature |
| Elongation after fracture (A) | ≥ 24 | % | Thickness ≤ 6 mm, gauge 50 mm |
| Elongation after fracture (A) | ≥ 22 | % | Thickness 6 – 12 mm, gauge 50 mm |
| Elongation after fracture (A) | ≥ 20 | % | Thickness > 12 – 16 mm, gauge 50 mm |
| Bend test | 180°, d = a, no cracks | – | Bend diameter = specimen thickness a |
09CuPTiRE-B Weathering Steel Pipe Direct Equivalent Standards and Substitute Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| China | TB/T 1979 | 09CuPTiRE-B | Original grade; plate, strip, pipe permissible |
| International | – | None | No exact ISO or other standard equivalent is published |
09CuPTiRE-B Weathering Steel Pipe Application Introduction
09CuPTiRE-B is engineered for unpainted long-life outdoor structures. Its self-developing rust patina minimizes maintenance and extends life to several decades. Typical industries and products:
- Railway: passenger coach bodies, freight car sides/roofs, underframe members
- Container: ISO container panels, frames, corner castings
- Construction: building cladding, roofing, bridge girders, transmission towers
- Industrial: machinery guards, storage tanks, ductwork
The material can be formed, welded, and punched with standard equipment. Preheating is rarely required for thicknesses below 30 mm.
Product Applications: Railway passenger coaches, Freight wagons, ISO shipping containers, Container chassis frames, Architectural wall panels, Weathering steel bridges, Transmission line towers, Industrial storage tanks
Processed into products: Hot-rolled plates and strips, Welded pipes, Cold-formed sections, Pressed and stamped parts, Welded subassemblies, Brackets and supports, Roof and side sheets, Longitudinal beams
Application industries: Railway transportation, Container manufacturing, Construction and infrastructure, Bridge engineering, Power transmission, Industrial equipment
09CuPTiRE-B Weathering Steel Pipe Similar Weathering Steel Grades for Reference
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| China | GB/T 4171 | Q295NH (09CuPTiRE-B variant) | May contain Cr, Ni; similar yield strength |
| Japan | JIS G3125 | SPA-H | Cr-Ni-Cu weathering steel; yield ≥ 345 MPa |
| USA | ASTM A588/A588M | Grade A | Multi-alloy weathering steel; yield ≥ 345 MPa |
| USA | ASTM A606/A606M | Type 4 | High-strength low-alloy weathering; yield ~345 MPa |
| Europe | EN 10025-5 | S355J2W (1.8965) | Cu-Cr-Ni; yield 355 MPa |
| India | IS 11587 | Fe510B-Cu | Weather resistant structural steel |
Notes:
Welding: Use low-hydrogen electrodes (E7015/E7016) or equivalent wire; no preheat for t ≤ 30 mm. Corrosion: The rust layer stabilizes after 6-12 months of alternating wet/dry cycles. In marine-industrial environments, performance is superior to plain carbon steel. Pipe manufacturing: Pipe dimensions and tolerances are typically per GB/T 13793 or customer specification. The base metal properties remain as per TB/T 1979. Additional requirements: If Charpy impact test is needed, it should be agreed upon at the time of ordering; typical value is KV₂ ≥ 27 J at 20 °C.
- Share
