ASTM A283 Grade B (A283Gr.B) Carbon Steel Plate
ASTM A283 Grade B (A283Gr.B) Carbon Steel Plate: Properties, Equivalents & Applications
Comprehensive material data sheet for ASTM A283 Grade B carbon steel plate, including chemical composition, mechanical and physical properties, international equivalents, and application guidance.
Hot rolled, normalized, stress relieved; can be cold formed, welded, and machined
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ASTM A283 Grade B Carbon Steel Plate Introduction
ASTM A283 Grade B is a low to intermediate tensile strength carbon steel plate primarily used for general structural purposes. It is supplied in the as-rolled, normalized, or stress-relieved condition and is suitable for welded, bolted, and riveted construction. The material offers good weldability and moderate formability, making it ideal for applications such as:
- Building frames
- Bridges
- Storage tanks
- Heavy machinery components
With a minimum yield strength of 185 MPa (27 ksi) for thicknesses up to 50 mm, this grade is not intended for pressure vessel service (covered by ASTM A285) but provides a cost-effective solution for structural fabrication where higher strength grades are not required.
ASTM A283 Grade B Carbon Steel Plate Chemical Composition
The chemical composition of ASTM A283 Grade B is controlled primarily for weldability and toughness. Maximum limits for carbon depend on plate thickness, with manganese, phosphorus, and sulfur specified. Copper is only required when copper steel is ordered. Silicon is not specified but may be present from deoxidation practices. These limits ensure adequate mechanical properties without compromising ductility.
| Element | Value (max %) | Remarks |
|---|---|---|
| Carbon (C) | 0.22 (plates ≤ 50 mm); 0.24 (50–100 mm); 0.26 (>100 mm) | Thickness-dependent; lower carbon for thinner sections |
| Manganese (Mn) | 0.90 | All thicknesses |
| Phosphorus (P) | 0.035 | All thicknesses |
| Sulfur (S) | 0.035 | All thicknesses |
| Copper (Cu) | 0.20 (when copper steel is specified) | Optional; not required otherwise |
ASTM A283 Grade B Carbon Steel Plate Thermal and Electrical Physical Properties
These values are representative for generic low-carbon steel similar to ASTM A283 Grade B. They are not specified in the material standard but are based on standard engineering references. Properties may vary with chemical composition, processing history, and temperature. Use these figures for design calculations and modeling.
| Property | Typical Value | Unit | Conditions |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At 20°C |
| Elastic Modulus (E) | 205 | GPa | At 20°C |
| Shear Modulus (G) | 80 | GPa | At 20°C |
| Poisson's Ratio (ν) | 0.29 | dimensionless | At 20°C |
| Thermal Expansion Coefficient (α) | 11.7 × 10⁻⁶ | /°C | 20–100°C |
| Thermal Conductivity (λ) | 51.9 | W/(m·K) | At 20°C |
| Specific Heat Capacity (c) | 486 | J/(kg·K) | At 20°C |
| Electrical Resistivity (ρₑ) | 0.15 × 10⁻⁶ | Ω·m | At 20°C |
ASTM A283 Grade B Carbon Steel Plate Mechanical Properties
Tensile and yield requirements vary with plate thickness. The table lists minimum values for common thickness ranges. Elongation is measured on a gauge length of 200 mm (8 in.) or 50 mm (2 in.) depending on plate thickness. These properties ensure the material's suitability for structural applications. Charpy impact testing is not a standard requirement unless specified at the time of order.
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Tensile Strength | 345–450 | MPa | Thickness ≤ 50 mm, as-rolled |
| Tensile Strength | 310–415 | MPa | Thickness 50–100 mm, as-rolled |
| Yield Point | 185 min | MPa | Thickness ≤ 50 mm, as-rolled |
| Yield Point | 170 min | MPa | Thickness 50–100 mm, as-rolled |
| Elongation (200 mm) | 25 min | % | Thickness 8.0–9.5 mm (typical example), gauge length 200 mm |
| Elongation (50 mm) | 25 min | % | Thickness ≤ 7.9 mm, gauge length 50 mm |
ASTM A283 Grade B Carbon Steel Plate International Equivalent Standards and Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| European Union | EN 10025-2 | S185 (1.0035) | Closest yield and tensile match; carbon max 0.22% |
| European Union | EN 10025-2 | S235JR (1.0038) | Commonly substituted but higher strength; verify design |
| Japan | JIS G3101 | SS400 | Higher tensile range; used for structural interchange |
| China | GB/T 700 | Q235B | Similar chemistry; yield slightly higher (235 MPa) |
| International | ISO 630-2 | S185B | Equivalent to EN S185; suitable alternative |
ASTM A283 Grade B Carbon Steel Plate Application Introduction
ASTM A283 Grade B plates are widely used where moderate strength, good weldability, and economy are priorities.
- Construction: Columns, beams, and bracing in buildings.
- Bridge engineering: Stiffeners, gussets, and non-critical bridge members.
- Industrial equipment: Tanks, hoppers, and support structures.
- Transportation: Truck frames, rail car components, and trailer parts.
The steel is typically formed by cold bending, shearing, and punching, then joined by conventional welding processes.
Product Applications: Structural frames, Building columns and beams, Bridges and girders, Storage tanks and silos, Base plates, Support brackets, Flanges
Processed into products: Gussets, Stiffeners, Mounting plates, Braces, Spacers, Weldments
Application industries: Construction, Bridge building, Storage tank manufacturing, Heavy machinery, Transportation (rail cars, truck frames), Shipbuilding (non-critical components)
ASTM A283 Grade B Carbon Steel Plate Similar Grade Alternatives
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A36/A36M | A36 | Higher yield (250 MPa) and tensile; most common structural steel |
| USA | ASTM A283/A283M | Grade C | Higher strength version within same standard (55–70 ksi) |
| USA | ASTM A285/A285M | Grade C | Low tensile carbon steel for pressure vessels; close chemistry |
| European Union | EN 10025-2 | S275JR | Higher strength (275 MPa yield); not directly interchangeable |
Notes:
Welding: Readily weldable by SMAW, GMAW, and SAW processes. Preheat is generally not required for thicknesses below 25 mm, but low-hydrogen practices are recommended to avoid cold cracking.
Formability: Good cold-forming capability; minimum bend radii should follow standard practice for the thickness and temper.
Corrosion resistance: Poor corrosion resistance; protective coatings (paint, galvanizing) are essential for outdoor or corrosive environments.
Impact testing: Not a standard requirement; if needed, supplementary impact tests must be agreed upon at the time of order.
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