09CuPTiRE-A Weather Resistant Steel Coil per TB/T 1979
09CuPTiRE-A Weather Resistant Steel Coil per TB/T 1979 - Composition & Properties
Comprehensive material data for 09CuPTiRE-A weather resistant steel coil under the Chinese railway industry standard TB/T 1979, including chemical composition, mechanical and thermal physical properties, as well as equivalent grades and application guidance.
Welding, cutting, bending, stamping, cold forming, machining
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09CuPTiRE-A Weather Resistant Steel Coil per TB/T 1979 Introduction
09CuPTiRE-A is a low-alloy atmospheric corrosion resistant steel designed for railway rolling stock and structural applications. It features a unique combination of copper, phosphorus, titanium, and rare earth elements (RE) to form a dense, self-protecting rust layer that significantly slows further corrosion. Under the Chinese standard TB/T 1979, this grade provides excellent weather resistance, good weldability, and reliable low-temperature toughness. It is typically supplied as hot-rolled coils, sheets, and plates in the as-rolled or controlled-rolled condition, making it suitable for manufacturing components exposed to outdoor environments without the need for painting or galvanizing in many cases.
09CuPTiRE-A Weather Resistant Steel Coil per TB/T 1979 Chemical Composition
The chemical requirements for 09CuPTiRE-A are specified in TB/T 1979. The deliberate additions of Cu, P, Ti, and RE enhance atmospheric corrosion resistance by promoting the formation of a stable, adherent patina. Low carbon content ensures good weldability and formability.
| Element | Specified Value (wt%) | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.12 | Max value |
| Silicon (Si) | 0.20 – 0.50 | |
| Manganese (Mn) | 0.25 – 0.55 | |
| Phosphorus (P) | 0.07 – 0.12 | Key corrosion-resistant element |
| Sulfur (S) | ≤ 0.020 | Max value for improved toughness |
| Copper (Cu) | 0.25 – 0.45 | Promotes patina formation |
| Titanium (Ti) | ≤ 0.03 | Grain refinement and strengthening |
| Rare Earth (RE) | 0.10 – 0.25 (added amount) | Mainly Ce and La; improves corrosion and mechanical properties |
| Aluminum (Als) | ≥ 0.020 (optional) | Soluble aluminum for deoxidation; commonly agreed upon |
09CuPTiRE-A Weather Resistant Steel Coil per TB/T 1979 Thermal and Electrical Physical Properties
The following physical properties are representative for low-alloy weather resistant steels. They are not normatively specified in TB/T 1979 but are collected from reliable steel handbooks and practical measurements. These values are valid at room temperature unless otherwise noted and may vary slightly depending on exact product thickness and processing history.
| Property | Typical Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At 20 °C |
| Modulus of Elasticity (E) | 206 | GPa | At 20 °C, longitudinal |
| Shear Modulus (G) | 79.4 | GPa | At 20 °C, calculated from E and ν |
| Poisson's Ratio (ν) | 0.3 | - | Elastic range, room temperature |
| Thermal Expansion Coefficient (α) | 10.6 – 12.2 | 10⁻⁶/K | Between 20 °C and 100 °C |
| Thermal Conductivity (λ) | 50.2 | W/(m·K) | At 100 °C |
| Specific Heat Capacity (cp) | 469 | J/(kg·K) | At 20 – 100 °C |
| Electrical Resistivity (ρe) | 0.18 – 0.25 | μΩ·m | At 20 °C |
09CuPTiRE-A Weather Resistant Steel Coil per TB/T 1979 Mechanical Properties
Mechanical properties are based on the requirements of TB/T 1979 for hot-rolled products. The values below apply to thicknesses up to 16 mm. For greater thicknesses, slight reductions in strength and elongation may be allowed according to the standard. The steel exhibits a good balance of strength and ductility, suitable for cold forming and welding.
| Property | Specified Value | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH / Rp0.2) | ≥ 295 | MPa | Thickness ≤ 16 mm, transverse |
| Tensile Strength (Rm) | ≥ 430 | MPa | Thickness ≤ 16 mm, transverse |
| Elongation (A) | ≥ 24 | % | Gauge length 5.65√S0 (A5), thickness ≤ 16 mm |
| Bend Test (Diameter of mandrel) | d = a | - | 180° bend, width of specimen ≥ 2a; a = thickness |
| Impact Energy (KV2) | ≥ 27 (at -40 °C) | J | Longitudinal, V-notch; often required for railway applications |
| Hardness | ≤ 160 | HBW | Approximate reference value, not always required |
09CuPTiRE-A Weather Resistant Steel Coil per TB/T 1979 Fully Equivalent Material Standards and Substitutable Grades
| Country/Region | Standard | Grade/Designation | Remarks |
|---|---|---|---|
| China | GB/T 4171 | Q295GNH (formerly 09CuPTiRE) | Chemical and mechanical properties are directly equivalent; the designation changed in the structural steel standard. |
| China | TB/T 1979 | 09CuPTiRE-A | Original grade for railway applications. |
09CuPTiRE-A Weather Resistant Steel Coil per TB/T 1979 Application Introduction
09CuPTiRE-A is primarily used in environments where atmospheric corrosion is a concern and periodic painting is costly or impractical. Its good weldability and moderate strength make it suitable for large welded structures. The steel can be used directly in the as-rolled condition, relying on its self-developed patina for protection. Typical processing includes shearing, bending, and welding, and it is compatible with common fabrication methods.
Product Applications: Railway gondola cars, flatcars, and tank car shells, Sidewalls and roofs of containers, Steel bridge decks and guardrails, Outdoor sculptures and urban furniture, Support structures for solar panels and wind barriers, Ventilation ducts and chimneys
Processed into products: Rolled structural profiles (angles, channels, beams), Press-formed corrugated roof and wall sheets, Welded stiffeners and brackets, Flanges and connection plates, Laser-cut and bent frame members, Sheared and punched brackets for assembly
Application industries: Railway transportation (freight wagons, passenger car bodies), Container manufacturing (shipping containers), Bridge engineering (minor structural members), Architecture (exposed steel frameworks, cladding), Power transmission (towers and poles), Agricultural and mining equipment
09CuPTiRE-A Weather Resistant Steel Coil per TB/T 1979 Similar and Alternative Weather Resistant Grades
| Country/Region | Standard | Grade/Designation | Remarks |
|---|---|---|---|
| Japan | JIS G3125 | SPA-H | High phosphorus Cu-Cr-Ni weather resistant steel; similar strength level but contains Cr and Ni instead of Ti and RE; corrosion resistance is comparable. |
| USA | ASTM A588/A588M | Grade A | Cu-Cr-Ni-V weather resistant steel with slightly higher strength; commonly used for bridges and structures; equivalent thickness performance differs. |
| Europe | EN 10025-5 | S355J2W | Structural weather resistant steel with slightly higher yield strength; contains Cu, Cr, and sometimes Ni; weldable and tough. |
| China | GB/T 4171 | Q310GNH (09CuPCrNi-A) | Domestic alternative with higher corrosion resistance due to added Cr and Ni; used in railway vehicles and containers. |
Notes:
For enhanced corrosion resistance and welding safety, preheating is generally not required for thicknesses up to 30 mm at ambient temperatures. Post-weld heat treatment is normally unnecessary. The selection of welding consumables should match the corrosion resistance of the base metal (e.g., using Cu-containing low-alloy electrodes). When used in extremely aggressive marine or industrial environments, a supplementary coating system may extend service life. The actual supplied thickness, width, and edge condition (mill edge or trimmed) should be agreed upon at the time of order.
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