Corten A Weathering Steel Plate
Corten A Weathering Steel Plate: ASTM A242 Type 1 Technical Specifications
Complete material data for Corten A weather resistant steel plate according to ASTM A242 Type 1, including chemical composition, mechanical properties, thermal properties and international equivalents.
Hot Rolling, Normalizing, Cold Rolling, Welding, Cutting, Bending, Forming
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Corten A Weathering Steel Plate Introduction
Corten A (ASTM A242 Type 1) is a high-strength low-alloy weathering steel renowned for its superior atmospheric corrosion resistance. When exposed to the weather, it forms a stable, adherent protective rust layer that eliminates the need for painting, giving structures a distinctive orange-brown patina. The alloy contains deliberate additions of copper, chromium, and phosphorus which enhance barrier properties of the oxide layer. Typically supplied in the as-rolled or normalized condition, Corten A offers a minimum yield strength of 345 MPa and good formability, making it ideal for architectural, bridge and container applications.
Corten A Weathering Steel Plate Chemical Composition
Chemical composition of Corten A according to ASTM A242 Type 1. Deliberate additions of copper, chromium, and phosphorus are essential for the self-protecting rust layer. Values are maximum unless a range is specified.
| Element | Standard Value | Remarks |
|---|---|---|
| Carbon (C) | ≤0.12 | |
| Manganese (Mn) | 0.20 – 0.50 | Typical range |
| Phosphorus (P) | 0.07 – 0.15 | Deliberately high for weathering resistance |
| Sulfur (S) | ≤0.030 | |
| Silicon (Si) | 0.25 – 0.75 | |
| Copper (Cu) | 0.25 – 0.55 | Improves atmospheric corrosion resistance |
| Chromium (Cr) | 0.30 – 1.25 | Promotes stable oxide layer |
| Nickel (Ni) | ≤0.65 | Optional element |
| Vanadium (V) | 0.02 – 0.10 | Optional microalloying |
| Others | – | Residual elements per ASTM A242 |
Corten A Weathering Steel Plate Thermal & Electrical Physical Properties
Typical physical properties for Corten A weathering steel. These values are similar to other structural carbon steels and are used for engineering calculations. Thermal properties may vary with temperature.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | 20°C |
| Modulus of Elasticity (E) | 210 | GPa | 20°C |
| Shear Modulus (G) | 80 | GPa | Estimated from E and ν |
| Poisson's Ratio (ν) | 0.3 | – | |
| Thermal Expansion Coefficient (α) | 12.0 | 10⁻⁶/°C | 20 – 100°C |
| Thermal Conductivity (λ) | 42 | W/(m·K) | 20°C |
| Specific Heat Capacity (c) | 460 | J/(kg·K) | 20°C |
| Electrical Resistivity (ρₑ) | 0.16 | Ω·mm²/m | 20°C |
Corten A Weathering Steel Plate Mechanical Properties
Minimum mechanical properties as per ASTM A242/A242M for structural weathering steel plates. Values depend on product form and thickness. Bending test requirements are generally 180° flat; impact testing is not normally required for service temperatures above -20°C.
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | ≥345 | MPa | Thickness ≤ 20 mm |
| Yield Strength (ReH) | ≥315 | MPa | 20 mm < Thickness ≤ 40 mm |
| Tensile Strength (Rm) | ≥480 | MPa | All thicknesses |
| Elongation (A50) | ≥21 | % | Gauge length 50 mm (sheet/strip) |
| Elongation (A200) | ≥18 | % | Gauge length 200 mm (plate) |
| Bend Test | No cracks | – | 180° bend, diameter as per standard |
Corten A Weathering Steel Plate Exact Equivalent Material Standards & Replaceable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| United States | ASTM A242/A242M | A242 Type 1 | Original Corten A specification |
| European Union | EN 10025-5 | S355J0W (1.8946) | Closest chemical and mechanical equivalent |
| European Union | EN 10025-5 | S355J2W (1.8965) | Higher impact energy variant (often interchangeable) |
| Japan | JIS G3125 | SPA-H | Hot rolled atmospheric corrosion resisting steel |
| China | GB/T 4171 | Q355GNH | High weather resistance structural steel |
Corten A Weathering Steel Plate Application Introduction
Corten A is primarily used in structural and architectural applications where long-term atmospheric corrosion resistance is required without maintenance painting. Its aesthetic patina and durability make it a favorite for outdoor sculptures and building cladding. Proper detailing is essential to avoid water traps that would prevent the protective rust layer from forming.
Product Applications: Weathering steel plate (Corten plate), Hot rolled sheet and coil, Structural beams and columns, Facade panels, Shipping containers, Railway wagons
Processed into products: Bridge girders and trusses, Transmission towers, Architectural cladding and sunshades, Sculpture and public art installations, Corten planter boxes and garden edging, Container corner casts and side panels
Application industries: Architecture & construction, Bridge engineering, Container manufacturing, Railway vehicle building, Art & sculpture, Power transmission
Corten A Weathering Steel Plate Similar / Alternative Weathering Steel Materials
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| United States | ASTM A588 | Grade A (Corten B) | Higher strength, commonly used for structural sections |
| European Union | EN 10025-5 | S355K2W (1.8967) | Higher notch toughness, suitable for lower temperatures |
| Japan | JIS G3125 | SPA-C | Cold rolled variant, thinner gauges |
| India | IS 11587 | Fe 540 WHR | Structural weather resistant steel |
| International | ISO 5952 | S355W | Equivalent to EN S355 versions |
Notes:
Welding: Corten A is easily weldable using standard procedures for low-alloy steels; matching filler metals (e.g., AWS E7018 or ER70S-6) are recommended to preserve corrosion resistance.
Weathering behaviour: The protective patina develops under wet/dry cycling; in marine or continuously humid environments, performance may be reduced, and supplementary protection may be needed.
Surface treatment: For aesthetic control, accelerated pre-weathering treatments are available. Painting or coating is possible but eliminates the self-protecting benefit.
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