ASTM A285 Grade B Pressure Vessel Steel Plate/Coil
ASTM A285 Grade B Pressure Vessel Steel Plate/Coil - Durable Carbon Steel for Moderate Service
Complete material data for ASTM A285/A285M Grade B carbon steel, including chemical composition, mechanical properties, and typical physical data. Used for pressure vessels and general fabrication, available in plate and coil form.
Hot rolling, cold rolling, normalizing (optional)
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ASTM A285 Grade B Pressure Vessel Steel Plate/Coil Introduction
ASTM A285/A285M Grade B is a carbon steel plate (and coil) intended for fusion-welded pressure vessels and moderate service temperature applications. It belongs to the family of low- and intermediate-tensile strength carbon steels standardized by ASTM. This grade offers a balance of weldability, formability, and adequate strength (tensile 345–485 MPa, yield ≥185 MPa in thinner sections). While not a true 'weathering steel' (like ASTM A588), it can be specified as 'weather-resistant' when supplied with protective coatings or in coil form for structural cladding. The material is typically delivered in the as-rolled condition, with normalizing available by agreement. It is widely accepted for boilers, storage tanks, and industrial components where cost-effective carbon steel is suitable. The coil product variant allows continuous processing for mass production of rolled sections, panels, and tubing.
ASTM A285 Grade B Pressure Vessel Steel Plate/Coil Chemical Composition Table
Chemical requirements according to ASTM A285/A285M for Grade B. Values are maximum unless a range is given. The silicon content depends on the deoxidation practice and plate thickness. Manganese limits vary with plate thickness (>50 mm applies extra range).
| Chemical Element | Standard Value | Remarks |
|---|---|---|
| Carbon (C) | 0.22 max | All thicknesses |
| Manganese (Mn) | 0.90 max | For plates ≤50 mm thickness |
| Manganese (Mn) | 0.70 to 1.00 | For plates >50 mm thickness |
| Phosphorus (P) | 0.035 max | |
| Sulfur (S) | 0.035 max | |
| Silicon (Si) | 0.08 to 0.25 | Semikilled, plates ≤25 mm; also allowed for semikilled plates >25 mm with max 0.25 |
| Silicon (Si) | 0.15 to 0.40 | Killed, all thicknesses; required for plates >25 mm (killed practice) |
ASTM A285 Grade B Pressure Vessel Steel Plate/Coil Thermal and Electrical Physical Properties
The following physical properties are typical for ASTM A285 Grade B carbon steel at room temperature unless otherwise noted. They are not part of the standard specification but represent commonly accepted engineering data suitable for design calculations.
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | 20 °C |
| Modulus of Elasticity (E) | 200–210 (typical 205) | GPa | Room temperature |
| Shear Modulus (G) | 80 | GPa | Room temperature |
| Poisson's Ratio (ν) | 0.3 | — | Room temperature |
| Thermal Expansion Coefficient (α) | 11.7 | 10⁻⁶/K | 0–100 °C |
| Thermal Conductivity (λ) | 51.9 | W/(m·K) | 100 °C |
| Specific Heat Capacity (c) | 486 | J/(kg·K) | 20–100 °C |
| Electrical Resistivity (ρ_e) | 0.165 | μΩ·m | 20 °C |
ASTM A285 Grade B Pressure Vessel Steel Plate/Coil Mechanical Properties
Tensile and yield requirements depend on plate thickness. Elongation is measured on either 8 in. (200 mm) or 2 in. (50 mm) gauge length. Bend test inside diameters are specified for 180° bending at room temperature. Impact toughness is not required by the base standard; it can be ordered as a supplementary requirement (S2).
| Property | Standard Requirement | Unit | Test Condition / Thickness |
|---|---|---|---|
| Tensile Strength (Rm) | 345–485 | MPa | All thicknesses |
| Tensile Strength (Rm) | 50–70 | ksi | All thicknesses |
| Yield Strength (ReH) | 185 min | MPa | Thickness ≤40 mm (≤1.5 in.) |
| Yield Strength (ReH) | 27 min | ksi | Thickness ≤40 mm (≤1.5 in.) |
| Yield Strength (ReH) | 170 min | MPa | Thickness >40 to 50 mm (>1.5–2 in.) |
| Yield Strength (ReH) | 25 min | ksi | Thickness >40 to 50 mm (>1.5–2 in.) |
| Yield Strength (ReH) | 160 min | MPa | Thickness >50 to 100 mm (>2–4 in.) |
| Yield Strength (ReH) | 23 min | ksi | Thickness >50 to 100 mm (>2–4 in.) |
| Yield Strength (ReH) | 138 min | MPa | Thickness >100 to 200 mm (>4–8 in.) |
| Yield Strength (ReH) | 20 min | ksi | Thickness >100 to 200 mm (>4–8 in.) |
| Yield Strength (ReH) | 125 min | MPa | Thickness >200 mm (>8 in.) |
| Yield Strength (ReH) | 18 min | ksi | Thickness >200 mm (>8 in.) |
| Elongation in 8 in. (200 mm) | 25 min | % | Thickness ≤25 mm (≤1 in.) |
| Elongation in 8 in. (200 mm) | 24 min | % | Thickness >25–50 mm (>1–2 in.) |
| Elongation in 8 in. (200 mm) | 23 min | % | Thickness >50–100 mm (>2–4 in.) |
| Elongation in 2 in. (50 mm) | 28 min | % | Thickness ≤25 mm (≤1 in.) |
| Elongation in 2 in. (50 mm) | 27 min | % | Thickness >25–50 mm (>1–2 in.) |
| Elongation in 2 in. (50 mm) | 26 min | % | Thickness >50–100 mm (>2–4 in.) |
| Bend Test (180°) – Inside Diameter | 1T | — | Thickness ≤12.5 mm (≤0.5 in.) |
| Bend Test (180°) – Inside Diameter | 1.5T | — | Thickness >12.5–25 mm (>0.5–1 in.) |
| Bend Test (180°) – Inside Diameter | 2T | — | Thickness >25–40 mm (>1–1.5 in.) |
| Bend Test (180°) – Inside Diameter | 2.5T | — | Thickness >40–50 mm (>1.5–2 in.) |
| Bend Test (180°) – Inside Diameter | 3T | — | Thickness >50–100 mm (>2–4 in.) |
ASTM A285 Grade B Pressure Vessel Steel Plate/Coil Fully Equivalent Material Standards & Replaceable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| International | — | — | No exact equivalent standard covers identical chemistry and tensile range simultaneously. |
ASTM A285 Grade B Pressure Vessel Steel Plate/Coil Application Introduction
ASTM A285 Grade B is primarily used for welded pressure vessels and industrial boilers operating at moderate temperatures. In coil form, it is often roll‑formed into panels, tubes, and structural profiles. While not an alloyed weathering steel, it can serve in mildly corrosive atmospheres when protected by painting, galvanizing, or other coatings. The material's good weldability and formability make it suitable for cost‑driven fabrication projects.
Product Applications: Fusion‑welded pressure vessels, Industrial boilers, Liquid storage tanks, Heat exchangers, Reactors, Hoppers and bins, Roll‑formed weather‑resistant coil sections (e.g., roofing, siding, drainage)
Processed into products: Vessel shell plates and heads, Nozzle necks and flanges, Support skirts and legs, Baffle plates, Tube sheets, Stiffening rings, Rolled structural shapes and profiles
Application industries: Pressure vessel manufacturing, Oil & gas, Chemical processing, Power generation (boilers, heat exchangers), Water treatment, Construction (structural cladding and panels)
ASTM A285 Grade B Pressure Vessel Steel Plate/Coil Similar / Alternative Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10028-2 | P235GH | Similar carbon‑manganese steel for pressure purposes; typically higher minimum yield (235 MPa) and slightly different composition. Suitable replacement in many non‑code applications. |
| Japan | JIS G3103 | SB400 (formerly SB410) | Comparable tensile range but higher yield strength (≥225 MPa). Often interchangeable for general welded structures. |
| China | GB 713 | Q245R | Chinese boiler and pressure vessel plate; yield ≥245 MPa, tensile 400–520 MPa. May be used where design allows higher strength. |
| ISO | ISO 2604-2 (withdrawn) | PH235 | Obsolete international grade similar in concept; can be cross‑referenced for legacy designs. |
| India | IS 2002 | Gr.1 | Indian standard for boiler steel plates with comparable chemistry but often with higher tensile requirements. |
Notes:
- ASTM A285 Grade B is not an atmospheric corrosion‑resisting steel per standards such as ASTM A588; the term 'weather resistant' in the product description typically refers to a coated coil product rather than the base metal.
- For applications requiring notch toughness, Charpy V‑notch tests can be specified under Supplementary Requirement S2 of ASTM A285/A285M.
- Plates over 50 mm thickness require higher manganese content and must be made to fully killed practice.
- Available in coil form up to certain thicknesses (usually ≤16 mm); confirm with mill supplier for wider widths.
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