ASME SA283 Grade A Steel Coil
ASME SA283 Grade A Steel Coil | Medium Strength Carbon Steel for Structural Applications
Comprehensive data sheet for ASME SA283/SA283M Grade A carbon steel coil. Includes chemical composition, mechanical properties, and international equivalent grades for low and intermediate tensile strength structural applications.
Welding, Bending, Forming, Shearing, Stamping, Machining
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ASME SA283 Grade A Steel Coil Introduction
ASME SA283/SA283M Grade A is a carbon-silicon structural steel categorized into the low and intermediate tensile strength range. It is specifically intended for general structural applications where notch toughness is not a design requirement. Grade A represents the lowest strength level within the SA283 specification, offering excellent weldability and formability. The material is typically supplied in the as-rolled condition and is widely used for welded bridges, buildings, and storage tanks. Its chemical composition is controlled to ensure reliable mechanical performance, primarily focusing on carbon and manganese content to achieve the specified tensile strength while maintaining high ductility for cold forming operations.
ASME SA283 Grade A Steel Coil Chemical Composition
The chemical composition adheres to ASME SA283/SA283M limits for Grade A. Carbon is the primary strengthening element, increasing tensile strength. Manganese is controlled to ensure uniformity and counteract the detrimental effects of sulfur. Phosphorus and Sulfur are limited to maintain ductility and weldability. Copper is specified when copper-bearing steel is required.
| Element | Standard Value (max, %) | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.14 | Heat Analysis; Product analysis tolerance applies per A6/A6M |
| Manganese (Mn) | ≤ 0.90 | For plates ≤ 40mm; For plates > 40mm thickness, Mn ≤ 1.00% is permissible |
| Phosphorus (P) | ≤ 0.035 | Maximum limit |
| Sulfur (S) | ≤ 0.040 | Maximum limit |
| Silicon (Si) | ≤ 0.40 | Typically 0.15-0.40 for killed steel; not specified for non-killed |
| Copper (Cu) | ≥ 0.20 (if specified) | Only applies when Copper-bearing steel is ordered |
ASME SA283 Grade A Steel Coil Thermal and Electrical Physical Properties
Physical properties represent generic estimated values for low-carbon structural steels equivalent to ASME SA283 Grade A. Density is essential for weight calculations. Thermal expansion is critical for welded joint design. Thermal conductivity and specific heat influence the heat input requirements during welding preheat and interpass temperature control.
| Property | Standard Required Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At 20°C (68°F) |
| Density (ρ) | 7850 | kg/m³ | At 20°C (68°F) |
| Modulus of Elasticity (E) | 200 | GPa | At Room Temperature |
| Shear Modulus (G) | 80 | GPa | At Room Temperature |
| Poisson's Ratio (ν) | 0.29 | — | At Room Temperature |
| Thermal Expansion Coeff. (α) | 12.0 | 10⁻⁶/K | Average, between 20°C and 100°C |
| Thermal Expansion Coeff. (α) | 12.5 | 10⁻⁶/K | Average, between 20°C and 200°C |
| Thermal Conductivity (λ) | 52 | W/(m·K) | At 20°C |
| Specific Heat Capacity | 486 | J/(kg·K) | At 20°C |
| Electrical Resistivity (ρ_e) | 0.16 | µΩ·m | At 20°C |
ASME SA283 Grade A Steel Coil Mechanical Properties
Mechanical testing is performed on specimens in accordance with ASTM A6/A6M. Tensile strength dictates the material's capacity to withstand pulling forces, while yield strength defines the limit for elastic behavior. Elongation is a key indicator of formability and is thickness-dependent. Bend testing requirements ensure the material can be formed without cracking during fabrication.
| Property | Standard Required Value | Unit | Test Condition |
|---|---|---|---|
| Tensile Strength (Rm) | 310 - 415 | MPa | Transverse or Longitudinal Specimen |
| Tensile Strength (Rm) | 45 - 60 | ksi | Transverse or Longitudinal Specimen |
| Yield Strength (ReH) | ≥ 165 | MPa | Lower Yield Point; Transverse or Longitudinal |
| Yield Strength (ReH) | ≥ 24 | ksi | Lower Yield Point; Transverse or Longitudinal |
| Elongation (A) in 200 mm (8 in) | ≥ 30 | % | For plate ≤ 3/8 in or 10mm thickness |
| Elongation (A) in 200 mm (8 in) | ≥ 28 | % | For plate > 3/8 in to 3/4 in or 10mm to 20mm thickness |
| Elongation (A) in 200 mm (8 in) | ≥ 25 | % | For plate > 3/4 in to 1 1/2 in or 20mm to 40mm thickness |
| Elongation (A) in 50 mm (2 in) | ≥ 34 | % | For plate ≤ 3/8 in or 10mm thickness |
| Elongation (A) in 50 mm (2 in) | ≥ 32 | % | For plate > 3/8 in to 3/4 in or 10mm to 20mm thickness |
| Elongation (A) in 50 mm (2 in) | ≥ 29 | % | For plate > 3/4 in to 1 1/2 in or 20mm to 40mm thickness |
| Bend Test (Mandrel Diameter) | 1 x t | - | t = specimen thickness; No cracks on outer bent surface |
ASME SA283 Grade A Steel Coil Fully Equivalent Material Standards and Substitutable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A283/A283M | Grade A | Identical standard; ASME is derived from ASTM for boiler & pressure vessel applications. |
| International | ISO 630-2 | Fe 310-0 | Equivalent based on tensile strength range and carbon content. |
| Europe | EN 10025-2 | S185 | Equivalent structural steel with tight match for chemical and mechanical properties. |
| China | GB/T 700 | Q195 | Functionally equivalent; note slight variations in elongation and phosphorus/sulfur limits. |
| Japan | JIS G3101 | SS330 | Alternate designation with equivalent strength grade for general structures. |
ASME SA283 Grade A Steel Coil Application Introduction
ASME SA283 Grade A is an economical structural steel suitable for a range of low to intermediate strength applications. Its excellent weldability and formability make it a popular choice for storage tanks, structural frameworks, and general fabrication projects where the cost is critical and high toughness is not mandated. It adapts well to hot-rolled coil products, allowing for continuous processing in manufacturing.
Product Applications: Atmospheric and low-pressure storage tanks, Prefabricated steel buildings and structural frames, Welded pipe piles and support columns, Agricultural machinery and silos, Automotive and rail car structural components
Processed into products: Welded Tank Walls and Bottoms (API 650/620 general applications), Bending-stiffeners and gusset plates, Base plates and end plates for structural columns, Stamped and formed brackets, Light structural profiles and angle sections
Application industries: Oil and Gas (Low-pressure storage tanks), Construction and Civil Engineering (Structural frames, bridges), Industrial Equipment (Heavy machinery bases, frames), Shipbuilding (Internal non-structural components), Transportation (Rail vehicles, truck frames)
ASME SA283 Grade A Steel Coil Compatible or Similar Alternative Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A36/A36M | A36 | Higher strength (Grade 36) but can replace Gr. A where higher strength is needed and ductility is acceptable. |
| USA | ASTM A1011/A1011M | SS Grade 30[205] | Commercial quality sheet steel with similar yield strength range, suited for lighter gauge forming. |
| Europe | EN 10025-2 | S235JR | Slightly higher tensile and yield strength; widely available structural grade that easily substitutes Gr. A. |
| International | ISO 630-2 | Fe 360B | Higher strength alternative (360 MPa tensile) compared to Gr. A (310-415 MPa tensile). |
| China | GB/T 700 | Q235B | Common medium-strength structural steel with higher tensile requirements, often substituting Gr. A in fabrication. |
Notes:
Caution: ASME SA283 Grades A does not have specified notch toughness requirements; it should not be used for critical low-temperature service or dynamic loading applications where brittle fracture is a concern. Welding: Low carbon content provides excellent weldability; typically, preheat is not required for thicknesses under 25mm, but proper interpass temperatures should be maintained. ASME Boiler & Pressure Vessel Code: When used in ASME Section VIII or Section XII constructions, specific design stress values must be verified based on the product form.
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