ASME SA283 Grade C Carbon Steel Coil
ASME SA283 Grade C Carbon Steel Coil: Structural Strength & Formability
Explore ASME SA283/SA283M Grade C carbon and low-alloy high-strength steel coil, offering balanced strength, weldability, and formability for structural and general engineering applications.
Hot rolling, pickling, oiling, slitting, shearing; can be cold formed, welded, bolted, riveted
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ASME SA283 Grade C Carbon Steel Coil Introduction
ASME SA283/SA283M Grade C is a carbon steel grade specified for moderate strength structural applications. It is produced as hot-rolled steel coil and is widely used in welded, bolted, and riveted construction. The material provides a minimum yield strength of 205 MPa (30 ksi) and tensile strength of 380–515 MPa (55–75 ksi), combined with good ductility for cold forming. Its controlled chemistry ensures reliable weldability, while the standard also allows copper-bearing variants for improved atmospheric corrosion resistance. Typical applications include structural frames, storage tanks, bridges, and general engineering components where cost-effective strength and fabrication ease are essential.
ASME SA283 Grade C Carbon Steel Coil Chemical Composition
The chemical requirements for ASME SA283 Grade C are as per ASTM A283/A283M. The limits ensure adequate strength and weldability. Copper may be specified as a minimum when enhanced atmospheric corrosion resistance is required. Silicon is not specified as a mandatory element, but is typically controlled during steelmaking.
| Element | Standard Value | Remarks |
|---|---|---|
| Carbon (C) | ≤0.24% | |
| Manganese (Mn) | 0.90–1.35% | |
| Phosphorus (P) | ≤0.030% | |
| Sulfur (S) | ≤0.030% | |
| Copper (Cu) | ≥0.20% (when copper steel is specified) | Optional; for improved corrosion resistance |
ASME SA283 Grade C Carbon Steel Coil Thermal and Electrical Physical Properties
The following values are typical for low-carbon structural steel and can be used for preliminary design calculations. They are not part of the SA283 specification and may vary slightly depending on actual composition and processing.
| Property | Standard Requirement Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At 20 °C |
| Modulus of Elasticity (E) | 205 | GPa | Tension, room temperature |
| Shear Modulus (G) | 80 | GPa | Calculated from E and ν |
| Poisson's Ratio (ν) | 0.29 | — | Elastic range |
| Thermal Expansion Coefficient (α) | 11.7 × 10⁻⁶ | /K | 20–100 °C, average linear |
| Thermal Conductivity (λ) | 52 | W/(m·K) | At 100 °C |
| Specific Heat Capacity | 486 | J/(kg·K) | At 20 °C |
| Electrical Resistivity (ρₑ) | 0.16 × 10⁻⁶ | Ω·m | At 20 °C |
ASME SA283 Grade C Carbon Steel Coil Mechanical Properties
Mechanical properties are determined on test specimens taken from the coil in the as-rolled condition. Yield strength and tensile strength are the primary design parameters. Ductility is assessed via elongation in either 200 mm (8 in) or 50 mm (2 in) gauge length, depending on plate thickness. A bend test is required to verify formability.
| Property | Standard Requirement Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Tensile Strength (Rm) | 380–515 | MPa | 55–75 ksi |
| Yield Strength (ReH) | ≥205 | MPa | Minimum, 30 ksi |
| Elongation (A) in 200 mm (8 in) | ≥20 | % | For thickness ≤ 19 mm (3/4 in) |
| Elongation (A) in 50 mm (2 in) | ≥26 | % | For thickness ≤ 12.5 mm (1/2 in), alternative gauge |
| Bend Test (Bend diameter) | 1.5 × thickness (up to 20 mm) | — | 180° bend, no cracks on outside surface; diameter increases for thicker sections |
ASME SA283 Grade C Carbon Steel Coil Exactly Equivalent Material Standards and Substitutes
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A283/A283M | Grade C | Identical chemical and mechanical requirements; SA283 is the ASME adoption for pressure vessel and boiler applications. |
| International | ASME SA283/SA283M | Grade C | Original specification. |
ASME SA283 Grade C Carbon Steel Coil Application Introduction
ASME SA283 Grade C steel coil is designed for moderate-strength structural and general engineering applications. Its excellent formability and weldability make it suitable for a wide range of fabricated components. Below are typical industries and products:
Product Applications: Hot-rolled steel coils and cut-to-length sheets, Welded structural beams and columns, Fabricated storage tanks and pressure vessels, Brackets, gussets, and connection plates, Automotive chassis and frame components
Processed into products: Base plates, anchor plates, Stiffeners and ribs, Mounting brackets, Flanges for piping, Agricultural tines and blades
Application industries: Construction and infrastructure (buildings, bridges), Transportation (railway cars, truck frames), Agricultural machinery and equipment, Storage and containment (tanks, silos), Pressure vessels (non-critical, thin-walled), General fabrication workshops
ASME SA283 Grade C Carbon Steel Coil Similar or Comparable Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| EU | EN 10025-2 | S275JR | Tensile strength 410–560 MPa, yield ≥275 MPa; slightly higher strength, but generally interchangeable for structural use. |
| Japan | JIS G3101 | SS400 | Tensile 400–510 MPa, yield ≥245 MPa; close in carbon steel category, often used as an equivalent in general construction. |
| China | GB/T 700 | Q235B | Tensile 370–500 MPa, yield ≥235 MPa; widely used structural carbon steel, similar applications. |
Notes:
Weldability: SA283 Grade C is readily weldable using common processes (SMAW, GMAW, SAW). Preheating may be required for thick sections. Copper addition: When specified as copper steel (Cu ≥ 0.20%), the atmospheric corrosion resistance is about twice that of plain carbon steel, making it suitable for unpainted exposure in mild environments. Delivery: Coils are typically supplied mill edge or trimmed edge, oiled or dry. Dimensional tolerances conform to ASTM A6/A6M.
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