ASTM A283 Grade B Carbon Steel Coil
ASTM A283 Grade B Carbon Steel Coil - Low-Carbon Structural Steel for General Applications
ASTM A283 Grade B is a low and intermediate tensile strength carbon steel plate and coil widely used in structural applications. It offers excellent weldability, good formability, and moderate strength.
Welding, Forming, Machining, Bending, Punching
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ASTM A283 Grade B Carbon Steel Coil Introduction
ASTM A283/A283M Grade B is a carbon steel grade specified for structural quality plates and coils. It is classified as low and intermediate tensile strength carbon steel, not a high-strength low-alloy steel. The material exhibits moderate strength, excellent weldability, and good formability, making it suitable for general structural and construction applications. It is commonly supplied in hot-rolled condition and is used for tanks, buildings, bridges, and other structures where lightweight and moderate loading are required.
ASTM A283 Grade B Carbon Steel Coil Chemical Composition
The chemical composition of ASTM A283 Grade B is controlled to provide balanced weldability and strength. Maximum limits are specified for elements to avoid detrimental effects on mechanical properties. Silicon is not specifically defined in the standard but is typically present in small amounts. Copper may be specified when improved atmospheric corrosion resistance is required.
| Element | Standard Value (max %) | Remarks |
|---|---|---|
| Carbon (C) | 0.17 | Ladle analysis |
| Manganese (Mn) | 0.90 | Ladle analysis; for plates over 40 mm, Mn up to 1.00% may be agreed |
| Phosphorus (P) | 0.04 | Maximum permitted |
| Sulfur (S) | 0.05 | Maximum permitted |
| Silicon (Si) | 0.15-0.40 (typical) | Not specified in ASTM A283; typical for killed steel |
| Copper (Cu) | 0.20 (min when specified) | Only if copper-bearing steel is ordered |
ASTM A283 Grade B Carbon Steel Coil Thermal and Electrical Physical Properties
These physical properties are typical for low-carbon steel compositions similar to ASTM A283 Grade B. They are provided for engineering calculations and are not part of the material specification. Values may vary slightly with exact chemistry and processing history.
| Property | Typical Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At room temperature |
| Modulus of Elasticity (E) | 200 - 210 | GPa | In tension |
| Shear Modulus (G) | 80 | GPa | Calculated from E and ν |
| Poisson's Ratio (ν) | 0.30 | - | Elastic range |
| Thermal Expansion Coefficient (α) | 12.0 | 10⁻⁶/K | Between 20°C and 100°C |
| Thermal Conductivity (λ) | 51.9 | W/(m·K) | At 100°C |
| Specific Heat Capacity (c) | 486 | J/(kg·K) | At 50-100°C |
| Electrical Resistivity (ρ_e) | 0.165 | μΩ·m | At 20°C |
ASTM A283 Grade B Carbon Steel Coil Mechanical Properties
The tensile properties apply to hot-rolled plates and coils in the as-rolled condition. Elongation varies with gauge length and specimen orientation. The values below are for standard test specimens taken transverse to the rolling direction. For coils, properties may vary through thickness after further processing.
| Property | Standard Required Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Yield Strength (ReH) | ≥ 185 | MPa | Minimum yield point; for thicknesses ≤ 200 mm |
| Tensile Strength (Rm) | 345 - 485 | MPa | Ultimate tensile strength range |
| Elongation (A) in 200 mm (8 in.) | ≥ 23 | % | For plate ≤ 40 mm thickness, transverse specimen |
| Elongation (A) in 50 mm (2 in.) | ≥ 27 | % | For plate ≤ 40 mm thickness, transverse specimen |
| Bend Test (Mandrel Diameter) | No cracks on 180° bend | - | D = 2t (t = specimen thickness) for plates ≤ 40 mm |
ASTM A283 Grade B Carbon Steel Coil Identical Standard Equivalents and Replaceable Grades
There are no direct international equivalents that match ASTM A283 Grade B exactly, as national standards have slightly different chemical and mechanical requirements. The table below shows the ASTM designation and notes on interchangeability.
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A283/A283M | Grade B | Original specification; available as coil, plate |
ASTM A283 Grade B Carbon Steel Coil Application Introduction
ASTM A283 Grade B is suitable for a wide range of structural and general engineering applications where moderate strength and good formability are needed. It is not recommended for pressure vessel or elevated-temperature service unless specifically endorsed. Typical uses include building frames, bridges, storage tanks, and agricultural equipment.
Product Applications: Structural beams and columns, Building frames, Bridge girders (secondary members), Storage tanks (atmospheric, low-temperature), Transmission towers, Agricultural implements
Processed into products: Brackets and supports, Base plates and gussets, Formed sheet metal enclosures, Stiffeners and ribs, Piping supports, Non-critical welded assemblies
Application industries: Construction, Infrastructure, Agricultural machinery, Material handling equipment, Fabrication workshops, Shipbuilding (non-pressure hull components)
ASTM A283 Grade B Carbon Steel Coil Similar Alternative Materials by Standard
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A36/A36M | A36 | Higher carbon and strength; can substitute with caution |
| China | GB/T 700 | Q235B | Comparable yield and tensile strength; widely used equivalent |
| Japan | JIS G3101 | SS400 | Similar general structural steel; commonly substituted |
| EU | EN 10025-2 | S235JR | Close match in strength and weldability; check impact requirements |
| India | IS 2062 | E250 (Fe 410W A/B) | Equivalent mechanical properties; E250B for ≤ 20 mm |
| International | ISO 630-2 | S235B | Comparable to S235JR; global structural steel grade |
Notes:
Important: ASTM A283 Grade B is intended for structural use and is not considered a pressure vessel quality steel. Weldability is excellent with all common welding processes. For improved corrosion resistance, copper-bearing variants (min 0.20% Cu) can be ordered. The material is typically supplied with mill test reports complying with ASTM A6/A6M. No Charpy impact requirements are mandated unless supplementary specification S5 is invoked. For cold forming, ensure bend radii appropriate for the thickness.
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