ASTM A283 Grade A Carbon Steel Coil
ASTM A283 Grade A Carbon Steel Coil - Properties, Equivalents & Uses
Comprehensive technical data for ASTM A283/A283M Grade A carbon and low-alloy high-strength steel coil, including chemical composition, mechanical properties, physical performance, international equivalents, and applications.
Hot rolling, welding, cutting, forming, punching, bending
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ASTM A283 Grade A Carbon Steel Coil Introduction
ASTM A283 Grade A is a carbon structural steel defined by the ASTM A283/A283M standard, primarily intended for general structural purposes. It features a low carbon content, providing excellent weldability and formability. Typically supplied as hot-rolled steel coils and plates, this grade has a minimum yield strength of 165 MPa (24 ksi) and tensile strength ranging from 310 to 415 MPa (45–60 ksi). It is not designed for high-temperature or pressure-retaining components but is widely used in riveted, bolted, or welded structures.
- Key Features: Low carbon for easy fabrication, good ductility, and consistent mechanical properties.
- Typical Delivery Condition: Hot-rolled, as-rolled or normalized if specified.
ASTM A283 Grade A Carbon Steel Coil Chemical Composition
The chemical composition is based on ladle analysis in accordance with ASTM A283/A283M. Copper is required only when copper-bearing steel is specified. Iron constitutes the remainder.
| Element | Standard Value (wt%) | Remarks |
|---|---|---|
| Carbon (C) | 0.14 max | Low carbon ensures good weldability. |
| Manganese (Mn) | 0.90 max | Contributes to strength and hardenability. |
| Phosphorus (P) | 0.030 max | Controlled for ductility. |
| Sulfur (S) | 0.040 max | Higher level improves machinability but may reduce toughness. |
| Copper (Cu) | 0.20 min (when copper steel is specified) | Optional: enhances atmospheric corrosion resistance. |
ASTM A283 Grade A Carbon Steel Coil Thermal, Physical & Electrical Properties
These values are typical for low‑carbon structural steels and are provided for general engineering calculations. Actual values may vary slightly depending on the specific heat treatment and processing history.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At 20 °C |
| Elastic Modulus (E) | 200 | GPa | At room temperature |
| Shear Modulus (G) | 80 | GPa | At room temperature |
| Poisson's Ratio (ν) | 0.30 | — | Typical |
| Thermal Expansion Coefficient (α) | 11.5 | 10⁻⁶ /K | 20 °C to 100 °C |
| Thermal Conductivity (λ) | 51.9 | W/(m·K) | At 20 °C |
| Specific Heat Capacity (cp) | 486 | J/(kg·K) | At 20 °C |
| Electrical Resistivity (ρₑ) | 0.15 | µΩ·m | At 20 °C |
ASTM A283 Grade A Carbon Steel Coil Mechanical Properties
Mechanical properties are determined from transverse test specimens at room temperature. Requirements are as per ASTM A283/A283M. Elongation is measured on a 2 in. (50 mm) or 8 in. (200 mm) gauge length.
| Property | Standard Value | Unit | Test Condition |
|---|---|---|---|
| Tensile Strength (Rm) | 45 – 60 | ksi | Transverse specimen |
| Tensile Strength (Rm) | 310 – 415 | MPa | Transverse specimen (SI) |
| Yield Strength (ReH), min | 24 | ksi | Transverse specimen |
| Yield Strength (ReH), min | 165 | MPa | Transverse specimen (SI) |
| Elongation (A) in 8 in. (200 mm), min | 23 | % | Transverse specimen |
| Elongation (A) in 2 in. (50 mm), min | 27 | % | Transverse specimen |
ASTM A283 Grade A Carbon Steel Coil Completely Equivalent Material Standards & Replaceable Grades
The grades listed below are recognized as the closest international equivalents to ASTM A283 Grade A. They share comparable chemical compositions and mechanical requirements and can often be used interchangeably in general structural applications.
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10025-2:2019 | S185 (1.0035) | Closest European equivalent; minimum yield strength is slightly higher (185 MPa), but fully interchangeable for structural use. |
| International | ISO 630-2:2011 | S185 (Fe310-0) | Identical to EN S185; same chemical and mechanical limits. |
| Germany (historical) | DIN 17100 | St33 | Withdrawn German standard; historically equivalent, now superseded by S185. |
ASTM A283 Grade A Carbon Steel Coil Application Introduction
ASTM A283 Grade A steel is best suited for general structural applications where moderate strength, excellent weldability, and low cost are the primary requirements. It is not recommended for pressure vessels, low‑temperature service, or highly stressed dynamic components.
- Fabrication: Can be easily cut, punched, bent, and welded using standard shop practices.
- Corrosion Protection: In atmospheric exposure, coating or painting is advised unless copper steel variant is used.
Product Applications: Structural beams and columns, Base plates and stiffeners, Gusset plates and brackets, Tank shells and silos, Railings and walkways, Agricultural equipment frames
Processed into products: Welded frames and trusses, Bolted/riveted structural connections, Cut and drilled mounting plates, Simple machine components, Supports and hangers, Farm implement parts
Application industries: Construction, Bridge building, Storage tanks, Transmission towers, Agricultural machinery, General manufacturing
ASTM A283 Grade A Carbon Steel Coil Similar / Alternative Materials with Comparable Performance
These materials offer similar weldability and formability but have slightly higher strength levels. They can be considered when a moderate increase in load‑bearing capacity is acceptable.
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A283/A283M | Grade B | Higher yield (185 MPa min); same formability, suitable for heavier structural sections. |
| USA | ASTM A36/A36M | A36 | Widely used structural steel with min. yield 250 MPa; can replace Grade A where higher strength is needed. |
| Japan | JIS G3101 | SS330 | Tensile strength 330-430 MPa, yield ≥205 MPa; often considered equivalent in non‑critical applications. |
| China | GB/T 700 | Q195 | Similar low‑carbon grade; yield ≥195 MPa, widely used for welded structures and general fabrication. |
Notes:
The listed mechanical properties apply to the hot‑rolled, as‑delivered condition. For thicknesses above 20 mm (≈ 3/4 in.), small reductions in minimum elongation may occur; refer to the standard for exact values. When atmospheric corrosion resistance is desired, copper steel may be ordered. All fabrications should follow the recommendations of the applicable structural codes. For pressure‑retaining service, consider grades such as ASTM A285 or A516.
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