ASTM A588 Grade C Weather Resistant Steel Coil
ASTM A588 Grade C Weather Resistant Steel Coil: High-Strength Low-Alloy Structural Steel with Superior Atmospheric Corrosion Resistance
Comprehensive data for ASTM A588 Grade C weathering steel coil: chemical composition, mechanical properties, physical properties, equivalent grades, and applications.
Hot rolling, cold forming, welding, machining, cutting, punching
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ASTM A588 Grade C Weather Resistant Steel Coil Introduction
ASTM A588 Grade C is a high-strength low-alloy structural steel specifically designed for enhanced atmospheric corrosion resistance, commonly referred to as weathering steel. Under alternating wet and dry conditions, it develops a tightly adherent protective oxide layer (patina) that significantly reduces corrosion rates, eliminating the need for painting in many applications. Key features:
- Minimum yield strength of 50 ksi (345 MPa) in thicknesses up to 4 in. (100 mm).
- Good notch toughness at low temperatures (optional).
- Excellent weldability using standard practices.
- Superior corrosion resistance, approximately four times that of carbon structural steel with copper.
- Available as coil, plate, bars, and structural shapes.
ASTM A588 Grade C Weather Resistant Steel Coil Chemical Composition
The chemical composition of ASTM A588 Grade C is carefully balanced to provide enhanced corrosion resistance through alloying elements such as copper, chromium, nickel, and vanadium. Heat analysis limits as per ASTM A588/A588M are shown below. Product analysis tolerances may apply.
| Element | Standard Value (max %) | Remarks |
|---|---|---|
| Carbon (C) | 0.15 | |
| Manganese (Mn) | 0.80–1.35 | |
| Phosphorus (P) | 0.04 | |
| Sulfur (S) | 0.05 | |
| Silicon (Si) | 0.15–0.40 | |
| Nickel (Ni) | 0.40 | |
| Chromium (Cr) | 0.40–0.70 | Key element for patina formation |
| Copper (Cu) | 0.20–0.50 | Essential for atmospheric corrosion resistance |
| Vanadium (V) | 0.02–0.10 | Microalloying element for strength |
ASTM A588 Grade C Weather Resistant Steel Coil Thermal and Electrical Physical Properties
Physical properties for ASTM A588 Grade C are similar to those of carbon structural steels. The following values are typical for low-alloy steels at room temperature and are provided for design guidance. No official standard values exist for these properties; they are representative of the steel class.
| Property | Typical Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At 20 °C |
| Modulus of Elasticity (E) | 200 | GPa | Room temperature |
| Shear Modulus (G) | 77 | GPa | Room temperature |
| Poisson's Ratio (ν) | 0.29 | – | Elastic range |
| Coefficient of Thermal Expansion (α) | 11.7 | 10⁻⁶/°C | 20–100 °C |
| Thermal Conductivity (λ) | 42 | W/(m·K) | At 20 °C |
| Specific Heat Capacity | 470 | J/(kg·K) | At 20 °C |
| Electrical Resistivity (ρ_e) | 0.22 | μΩ·m | At 20 °C |
ASTM A588 Grade C Weather Resistant Steel Coil Mechanical Properties
Mechanical properties are dependent on thickness and product form. The following values represent the minimum requirements for plates, bars, and structural shapes according to ASTM A588/A588M for Grade C. Elongation requirements vary with specimen type and thickness. Bend test: cold bend to 180° without cracking on outside of bent portion, with an inside diameter as specified (typically 1.5t to 3t depending on thickness).
| Property | Standard Requirement | Unit | Test Condition / Remarks |
|---|---|---|---|
| Yield Strength (ReH) | ≥ 50 | ksi | Thickness ≤ 4 in. (100 mm) |
| Yield Strength (ReH) | ≥ 345 | MPa | Thickness ≤ 100 mm, per A588M |
| Tensile Strength (Rm) | ≥ 70 | ksi | Thickness ≤ 4 in. (100 mm) |
| Tensile Strength (Rm) | ≥ 485 | MPa | Thickness ≤ 100 mm, per A588M |
| Elongation (A) in 8 in. (200 mm) | ≥ 18 | % | For plates and bars; thickness dependent |
| Elongation (A) in 2 in. (50 mm) | ≥ 21 | % | For plates and bars; thickness ≤ 0.75 in. (19 mm) typical |
| Bend Test (Cold) | 180° bend | deg | Inside diameter per specification, no cracks |
ASTM A588 Grade C Weather Resistant Steel Coil Fully Equivalent Material Standards and Replaceable Grades
Grade C of ASTM A588 is a specific weathering steel composition. While no international standard provides an exact match, the following grades are often considered suitable substitutes under recognized specifications. The equivalence is based on comparable mechanical properties and corrosion resistance.
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| United States | ASTM A588/A588M | Grade C | Original specification |
| United States | ASTM A242/A242M | Type 1 | Similar weather resistance, lower yield strength (46 ksi min) |
| Europe | EN 10025-5 | S355J2W | Closest European equivalent; requires Charpy impact at -20°C |
| Japan | JIS G3114 | SMA490CP | Weather-resistant hot-rolled steel; painted or unpainted use |
| China | GB/T 4171 | Q355NH | Comparable mechanical properties; slight composition differences |
ASTM A588 Grade C Weather Resistant Steel Coil Application Introduction
ASTM A588 Grade C is ideally suited for structures exposed to the atmosphere where a natural rust-like appearance is desired and maintenance painting is to be avoided. The steel forms a dense, adherent patina under cycles of wetting and drying. Design considerations: proper detailing to avoid water traps and ensure free air circulation is essential for optimal performance. The material can be supplied as coil for roll-forming, stamping, and welded tubular products.
- Used in both welded and bolted construction.
- Paintable if required, without compromising base metal properties.
- Available in thicknesses from thin sheets to heavy plates.
Product Applications: Steel coils for cold-formed profiles, Welded H-beams and box girders, Structural plates for bridges, Architectural cladding and facades, Light poles and sign supports, Railway wagons and truck bodies
Processed into products: Bridge girders and trusses, Transmission tower legs and arms, Building frames and atrium structures, Gantry crane beams, Roll-formed purlins and girts, Welded storage tanks (atmospheric)
Application industries: Bridge engineering (highway, railway, pedestrian), Building and construction (architectural exposed steel), Transmission towers and utility poles, Railway rolling stock and containers, Marine and coastal structures (not immersed), Mining and material handling equipment
ASTM A588 Grade C Weather Resistant Steel Coil Similar/Alternative Material Recommendations
These materials exhibit similar corrosion resistance and mechanical properties, making them potential alternatives depending on availability and design requirements. Minor adjustments in welding procedures or fabrication may be required.
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| United States | ASTM A588 | Grade A / Grade B / Grade K | Same standard, different alloy balance |
| United States | ASTM A709 | 50W / HPS 50W | Bridge steel with weathering option |
| Europe | EN 10025-5 | S355J0W / S355K2W | J0 for 0°C impact; K2 for -20°C impact |
| India | IS 8500 | Fe 490WN | Weldable weathering steel |
| Russia | GOST 6713 | 10KhSND | Low-alloy structural steel for bridge building |
Notes:
Weathering steel usage notes:
- Not recommended for continuously wet environments (e.g., submerged or buried) where the protective patina cannot form.
- Exposed to high concentrations of corrosive chemicals (industrial fumes, de-icing salts) may require painting.
- ASTM A588 Grade C is available with supplementary requirements for Charpy impact testing (e.g., Zone 1, 2, or 3) when specified.
- Welding consumables should match the base metal composition to maintain corrosion resistance (AWS E7018-W or equivalent).
- For coil products, tolerances and surface quality comply with ASTM A635/A635M or ASTM A568/A568M as applicable.
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