ASTM A285 Grade B (A285GRB) Pressure Vessel Steel Plate
ASTM A285 Grade B (A285GRB) Pressure Vessel Steel Plate
Complete technical data and equivalent grades for ASTM A285 Grade B carbon steel plate for pressure vessels and boilers.
Hot rolling, normalizing (optional), cutting, welding, forming, drilling, machining
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ASTM A285 Grade B Pressure Vessel Steel Plate Introduction
ASTM A285 Grade B (A285GRB) is a carbon-manganese steel intended for welded pressure vessels and boilers up to a moderate strength level. It is supplied in the hot-rolled condition and is typically used for moderate and lower temperature service. The steel offers good weldability, ductility, and formability, making it suitable for riveted, bolted, or welded construction. With a minimum yield strength of 185 MPa (27 ksi) and tensile strength ranging from 345–450 MPa (50–65 ksi), A285 Gr B provides reliable performance for storage tanks, low-pressure vessels, and structural components in boiler applications. Its chemical composition is controlled to ensure adequate toughness after welding and during operation. The grade is widely recognized and accepted under the ASME Boiler and Pressure Vessel Code as SA285 Grade B. Plates are available in various thicknesses, typically up to 50 mm (2 in.), and can be normalized when improved toughness is required.
ASTM A285 Grade B Pressure Vessel Steel Plate Chemical Composition
The following table lists the chemical requirements as per ASTM A285/A285M standard for Grade B. Values are maximums unless a range is given. Composition limits vary with plate thickness. Silicon content is required only for plates over 38 mm (1.5 in.) thick; for other thicknesses it is not specified but is typically reported by the manufacturer.
| Element | Standard Value (wt%) | Remarks |
|---|---|---|
| C | 0.22 max | For plate thickness ≤ 25 mm |
| C | 0.23 max | For plate thickness > 25 mm to 50 mm |
| Mn | 0.90 max | For plate thickness ≤ 25 mm |
| Mn | 0.60 – 0.90 | For plate thickness > 25 mm to 50 mm |
| P | 0.035 max | |
| S | 0.035 max | |
| Si | 0.15 – 0.40 | Required for plates > 38 mm thickness; for thinner plates, Si content may be reported but not specified |
| Cu | 0.40 max (if specified) | Residual, only when copper steel is required |
| Ni | 0.40 max (if specified) | Residual |
| Cr | 0.30 max (if specified) | Residual |
| Mo | 0.12 max (if specified) | Residual |
| V | 0.08 max | Residual |
ASTM A285 Grade B Pressure Vessel Steel Plate Thermal and Electrical Physical Properties
The physical properties listed below are typical for carbon steel of similar composition and are provided for general guidance. They are not specified in the ASTM A285 standard and may vary slightly with exact chemical composition, heat treatment, and temperature.
| Property | Reference Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At 20 °C |
| Modulus of Elasticity (E) | 200 | GPa | At room temperature |
| Shear Modulus (G) | 79 | GPa | At room temperature |
| Poisson's Ratio (ν) | 0.26 – 0.29 | – | At room temperature |
| Thermal Expansion Coefficient (α) | 11.7 × 10⁻⁶ | 1/K | Between 20 °C and 100 °C |
| Thermal Expansion Coefficient (α) | 12.5 × 10⁻⁶ | 1/K | Between 20 °C and 200 °C |
| Thermal Conductivity (λ) | 51.9 | W/(m·K) | At 100 °C |
| Thermal Conductivity (λ) | 48.1 | W/(m·K) | At 200 °C |
| Specific Heat Capacity (c) | 486 | J/(kg·K) | At 20 °C |
| Electrical Resistivity (ρ_e) | 0.142 × 10⁻⁶ | Ω·m | At room temperature |
ASTM A285 Grade B Pressure Vessel Steel Plate Mechanical Properties
Tensile and bending requirements per ASTM A285 Grade B. All tests are performed at room temperature unless stated otherwise. Elongation values are given for a gauge length of 200 mm (8 in.). Bend test is carried out at 180° bending angle.
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | 185 min | MPa | 0.2% offset, room temperature |
| Tensile Strength (Rm) | 345 – 450 | MPa | Room temperature |
| Elongation (A) | 22 min | % | Gauge length 200 mm, plate thickness ≤ 19.0 mm |
| Elongation (A) | 20 min | % | Gauge length 200 mm, plate thickness > 19.0 mm to 25.4 mm |
| Elongation (A) | 19 min | % | Gauge length 200 mm, plate thickness > 25.4 mm to 38.1 mm |
| Elongation (A) | 18 min | % | Gauge length 200 mm, plate thickness > 38.1 mm to 50.8 mm |
| Bend Test | 1.0 × t | bend diameter | 180° bend, plate thickness ≤ 25 mm |
| Bend Test | 1.5 × t | bend diameter | 180° bend, plate thickness > 25 mm to 50 mm |
ASTM A285 Grade B Pressure Vessel Steel Plate Identical Standard Grades for Direct Substitution
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A285/A285M | Grade B | Original specification |
| USA | ASME SA285/SA285M | Grade B | Identical material accepted under ASME Boiler and Pressure Vessel Code |
ASTM A285 Grade B Pressure Vessel Steel Plate Application Introduction
ASTM A285 Grade B plates are primarily used in the fabrication of welded pressure vessels and boilers where moderate strength and good weldability are required. They are suitable for stationary and unfired pressure vessels, process equipment, and storage containers operating at low or intermediate pressures. Typical applications include:
- Low-pressure boiler drums and shells
- Air receiver tanks and gas storage vessels
- Heat exchanger shells and channel sections
- Process plant vessels and columns
- Industrial piping and fittings
- Structural components of boiler settings
Product Applications: Boiler drums, shells, and heads, Air receiver and compressed gas tanks, Heat exchanger bodies, Low-pressure process vessels, Water treatment tanks, Piping flanges and fittings (when cut from plate)
Processed into products: Cylindrical shells (rolled and welded plates), Dished and flanged heads (formed from plate), Manway and nozzle reinforcing pads, Tube sheets (thin to medium thickness), Baffle plates and support rings, Skirt and saddle supports
Application industries: Oil & Gas (storage, processing), Power generation (boilers, steam drums), Chemical and petrochemical processing, Water treatment and desalination, Industrial machinery and equipment, Construction (structural parts in boiler houses)
ASTM A285 Grade B Pressure Vessel Steel Plate Similar / Alternative Grade Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A516/A516M | Grade 60 | Higher strength (yield ≥ 220 MPa, tensile 415–550 MPa), often used for pressure vessels; requires careful weld procedure adaptation |
| USA | ASTM A516/A516M | Grade 65 | Higher strength (yield ≥ 240 MPa, tensile 450–585 MPa); suitable when higher design stress is needed |
| European Union | EN 10028-2 | P265GH | Higher yield (≥ 265 MPa) and wider temperature application; commonly used in European pressure equipment |
| China | GB/T 713.2 | Q245R | Comparable carbon-manganese steel, but with higher guaranteed yield (≥ 245 MPa) and tensile (400–520 MPa); widely used in Chinese boiler industry |
| Japan | JIS G3103 (withdrawn) | SB410 | Historically used; yield ≥ 225 MPa, tensile ≥ 410 MPa; no longer current, but serves as a reference for replacement |
Notes:
Welding: A285 Grade B possesses good weldability with standard methods (SMAW, SAW, GMAW). Preheating is usually not required for thin sections, but may be recommended for thicker plates (>30 mm) to reduce cooling rate. Post-weld heat treatment (PWHT) may be applied in accordance with relevant codes. Normalizing: When ordered, normalizing can improve uniformity and toughness; otherwise, plates are delivered in as-rolled condition. Test Certificates: Mill test reports showing chemical and mechanical results are normally provided. Additional testing (e.g., ultrasonic examination, impact test) can be specified through supplementary requirements.
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