ASTM A285 Grade A Pressure Vessel Steel Plate
ASTM A285 Grade A Pressure Vessel Steel Plate - Properties & Equivalents
Complete data for ASTM A285 Grade A (A285GRA) boiler and pressure vessel steel: chemical composition, mechanical and physical properties, global equivalents, and application guide.
Hot rolling, cold forming, welding, flanging, normalizing, stress relieving
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ASTM A285 Grade A Pressure Vessel Steel Plate Introduction
ASTM A285 Grade A is a carbon-manganese steel plate designed for fusion-welded pressure vessels and boilers. It offers moderate strength, excellent weldability, and good ductility, making it economical for moderate-service applications. Key Features:
- Low carbon content ensures excellent weldability without preheating in smaller thicknesses.
- Typical yield strength of 165 MPa minimum, with tensile strength between 310 and 450 MPa.
- Supplied in the as-rolled, normalized, or stress-relieved condition.
- Conforms to ASME Boiler and Pressure Vessel Code, Section II, Part A when dual-certified as SA285 Grade A.
- Widely used in storage tanks, low-pressure boilers, and process vessels where operating temperatures do not exceed about 450°C.
The plate is usually produced by hot rolling and can be formed, flanged, and welded into cylinders, heads, and various pressure vessel components.
ASTM A285 Grade A Pressure Vessel Steel Plate Chemical Composition
The table below lists the chemical requirements according to ASTM A285/A285M. Grade A specifies maximum limits for carbon, manganese, phosphorus, and sulfur. The steel is killed and fine grain practice is not mandatory unless different requirements are agreed. Silicon is not specified but is typically present from deoxidation (approx. 0.10–0.30%). Residual elements such as copper, nickel, chromium, and molybdenum are generally at low levels.
| Chemical Element | Standard Value (max %) | Remarks |
|---|---|---|
| Carbon (C) | 0.17 | Heat analysis |
| Manganese (Mn) | 0.90 | Heat analysis; product analysis max 0.98 |
| Phosphorus (P) | 0.035 | Heat analysis; product analysis max 0.040 |
| Sulfur (S) | 0.035 | Heat analysis; product analysis max 0.040 |
ASTM A285 Grade A Pressure Vessel Steel Plate Thermal and Electrical Physical Properties
The following data represent typical physical properties for carbon-manganese steel of this grade. They are not prescribed by ASTM A285/A285M but are useful for design calculations. Values may vary slightly depending on exact composition and heat treatment.
| Property | Typical Value | Unit | Test Conditions / Remarks |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | Room temperature |
| Modulus of Elasticity (E) | 200–210 | GPa | Room temperature |
| Shear Modulus (G) | 80 | GPa | Calculated from E and ν |
| Poisson's Ratio (ν) | 0.27–0.33 | – | Typical range |
| Thermal Expansion Coefficient (α) | 11.5–12.5 | µm/m·°C | 20–100°C |
| Thermal Expansion Coefficient (α) | 12.5–13.5 | µm/m·°C | 20–200°C |
| Thermal Conductivity (λ) | 50–55 | W/m·K | At 100°C |
| Thermal Conductivity (λ) | 45–50 | W/m·K | At 300°C |
| Specific Heat Capacity (cp) | 460–500 | J/kg·K | 20–200°C |
| Electrical Resistivity (ρe) | 0.14–0.18 | µΩ·m | At 20°C |
ASTM A285 Grade A Pressure Vessel Steel Plate Mechanical Properties
Tensile and bend properties are determined in accordance with ASTM A285/A285M. Key points:
- Yield strength and elongation requirements depend on plate thickness and gauge length.
- No impact test is required in the base specification; toughness may be agreed as a supplementary requirement.
- Bend test mandrel diameter varies with thickness.
| Property | Standard Requirement | Unit | Test Conditions / Remarks |
|---|---|---|---|
| Yield Strength (ReH) | ≥ 165 | MPa | At room temperature |
| Tensile Strength (Rm) | 310–450 | MPa | |
| Elongation (A) | ≥ 25 | % | Gauge length 200 mm (8 in.), thickness ≤ 19 mm |
| Elongation (A) | ≥ 23 | % | Gauge length 200 mm, thickness > 19 mm to 38 mm |
| Elongation (A) | ≥ 21 | % | Gauge length 200 mm, thickness > 38 mm to 50 mm |
| Elongation (A) | ≥ 18 | % | Gauge length 200 mm, thickness > 50 mm to 200 mm |
| Elongation (A) | ≥ 28 | % | Gauge length 50 mm (2 in.), thickness ≤ 19 mm |
| Elongation (A) | ≥ 25 | % | Gauge length 50 mm, thickness > 19 mm to 38 mm |
| Elongation (A) | ≥ 23 | % | Gauge length 50 mm, thickness > 38 mm to 50 mm |
| Elongation (A) | ≥ 21 | % | Gauge length 50 mm, thickness > 50 mm to 200 mm |
| Bend Test (Mandrel Diameter) | Diameter = 1 × thickness | mm | Thickness ≤ 25 mm |
| Bend Test (Mandrel Diameter) | Diameter = 1.5 × thickness | mm | Thickness > 25 mm to 50 mm |
| Bend Test (Mandrel Diameter) | Diameter = 2 × thickness | mm | Thickness > 50 mm to 200 mm |
ASTM A285 Grade A Pressure Vessel Steel Plate Full Equivalent Material Standards and Replaceable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASME SA285/SA285M | SA285 Grade A | Identical material; dual certified per ASME Boiler & Pressure Vessel Code, Section II, Part A. |
ASTM A285 Grade A Pressure Vessel Steel Plate Application Introduction
ASTM A285 Grade A is designed for moderate-service welded pressure equipment. It can be formed, welded, and machined into a wide range of industrial components. Design considerations:
- Max design temperature typically limited to about 450°C by ASME code rules.
- Not intended for low-temperature services requiring impact testing unless supplementary requirements are applied.
- Excellent weldability using common fusion methods without preheat for smaller thicknesses.
Product Applications: Low-pressure boilers and steam generators, Storage tanks for liquids and gases (API 650 type), Process vessels, reactors, and autoclaves, Heat exchanger shells and channels, Air receivers and compressed air tanks
Processed into products: Cylindrical shells and courses, Dished and flanged heads, Flat end plates and tube sheets, Reinforcing pads and nozzles, Flanges, flanged fittings, and manway covers, Structural parts of welded pressure equipment
Application industries: Oil & Gas (storage tanks, separators, low-pressure vessels), Power Generation (boiler drums, economizers, steam headers), Chemical & Petrochemical (process reactors, heat exchangers), Shipbuilding (pressure parts, compressed air receivers), Water Treatment (pressure filters, softeners)
ASTM A285 Grade A Pressure Vessel Steel Plate Similar / Alternative Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| China | GB/T 713-2014 | Q245R | Similar carbon steel for pressure vessels; often includes impact toughness requirements and lower strength margins. |
| Europe | EN 10028-2 | P235GH | Comparable pressure vessel steel with guaranteed elevated temperature properties and notched bar impact values; slightly higher carbon and manganese are possible. |
| Japan | JIS G3103 | SB410 | Boiler and pressure vessel carbon steel; tensile strength 410–550 MPa, usually requires impact test. |
| International | ISO 9328-2 | P235 | Steel for pressure purposes; similar application range, but chemical and mechanical limits differ slightly. |
Notes:
ASTM A285 Grade A is often dual-certified as ASME SA285 Grade A. Welding consumables: use matching or low-hydrogen electrodes such as E7018 or ER70S-6. Post-weld heat treatment may be required depending on thickness and service conditions per applicable fabrication codes (e.g., ASME Section VIII). Corrosion resistance: limited; suitable for non-critical environments. For sour service, HIC testing is not normally performed on this grade.
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