ASTM A285 Grade C Carbon Steel Plate for Pressure Vessels
ASTM A285 Grade C Carbon Steel Plate for Pressure Vessels - Composition, Properties & Global Equivalents
Comprehensive technical data for ASTM A285 Grade C (A285GRC) low-to-intermediate tensile strength carbon steel plate for pressure vessels and boilers, including chemical composition, mechanical and physical properties, and international equivalent grades.
Hot rolling, normalizing, cutting, forming, welding, machining
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ASTM A285 Grade C Carbon Steel Plate for Pressure Vessels Introduction
ASTM A285 Grade C is a carbon-silicon steel plate intended for fusion-welded pressure vessels and boilers where modest strength is required. It offers adequate formability and weldability for fabricating storage tanks, low-pressure vessels, and structural shells. The material is typically supplied in the hot-rolled or normalized condition, with a guaranteed minimum yield strength of 205 MPa (30 ksi) and tensile strength between 380–515 MPa (55–75 ksi). Its balanced chemical composition ensures good ductility and toughness for standard service temperatures, though impact requirements must be separately specified.
- Good formability and weldability for low- to medium-stress applications
- Cost-effective carbon-manganese-silicon steel
- Commonly used for utility boilers and atmospheric storage tanks
ASTM A285 Grade C Carbon Steel Plate for Pressure Vessels Chemical Composition
Ladle analysis per ASTM A285/A285M standard. Silicon is typically added for deoxidation; ranges correspond to semi-killed or killed practice. Residual elements are not specified but may be present in trace amounts.
| Element | Standard Value | Notes |
|---|---|---|
| Carbon (C) | ≤ 0.28 | Maximum |
| Manganese (Mn) | ≤ 0.90 | Maximum |
| Phosphorus (P) | ≤ 0.035 | Maximum |
| Sulfur (S) | ≤ 0.035 | Maximum |
| Silicon (Si) | 0.15 – 0.40 | Typical range when specified as a deoxidizer; can be omitted for rimmed steel. |
ASTM A285 Grade C Carbon Steel Plate for Pressure Vessels Thermal and Electrical Physical Properties
Representative physical properties for carbon steel similar to A285 Grade C. Values may vary slightly depending on specific heat treatment and grain structure. Data compiled from established engineering references for low-carbon steels.
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At 20 °C |
| Modulus of Elasticity (E) | 200 - 210 | GPa | At 20 °C |
| Shear Modulus (G) | 75 - 80 | GPa | Estimated |
| Poisson's Ratio (ν) | 0.29 - 0.30 | – | At room temperature |
| Thermal Expansion Coefficient (α) | 11.5 - 12.1 | ×10⁻⁶ /K | 20 – 100 °C; increases with temperature |
| Thermal Conductivity (λ) | 50 - 54 | W/(m·K) | At 100 °C |
| Specific Heat Capacity | 470 - 500 | J/(kg·K) | At 20 – 100 °C |
| Electrical Resistivity (ρ_e) | 0.14 - 0.18 | µΩ·m | At 20 °C |
ASTM A285 Grade C Carbon Steel Plate for Pressure Vessels Mechanical Properties
Tensile and bending requirements per ASTM A285/A285M. Elongation values apply to standard 200 mm (8 in.) gauge length. Bend test diameters depend on the actual tensile strength of the plate. Impact toughness is not mandatory unless specified by the purchaser.
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | ≥ 205 (30 ksi) | MPa (ksi) | Minimum, at room temperature |
| Tensile Strength (Rm) | 380 - 515 (55 - 75 ksi) | MPa (ksi) | Applicable full thickness range |
| Elongation (A) | ≥ 27 | % | 200 mm gauge, thickness ≤ 50 mm |
| Elongation (A) | ≥ 25 | % | 200 mm gauge, thickness > 50 mm |
| Bend Test (Bend Diameter) | 1.5 × t | – | For plates with tensile strength 55 – 65 ksi, 180° bend, t = plate thickness |
| Bend Test (Bend Diameter) | 2.0 × t | – | For plates with tensile strength >65 – 75 ksi, 180° bend, t = plate thickness |
ASTM A285 Grade C Carbon Steel Plate for Pressure Vessels Completely Equivalent Material Standards and Substitutable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| China | GB/T 713.2-2023 | Q245R | Similar tensile range 400–520 MPa, min. YS 245 MPa; broadly interchangeable for pressure vessels. |
| Europe | EN 10028-2 | P265GH | Slightly higher YS (≥265 MPa) and similar TS (410–530 MPa); requires re-qualification for design. |
| Japan | JIS G3103 | SB450 | Tensile strength 450–540 MPa, YS ≥245 MPa; may require slight design adjustment. |
| ISO | ISO 2604-Ⅱ | PC | Historical grade with comparable strength; not widely manufactured but technically equivalent. |
ASTM A285 Grade C Carbon Steel Plate for Pressure Vessels Application Introduction
ASTM A285 Grade C plates are optimally suited for low- to medium-pressure vessels and boilers operating at modest temperatures. The steel's good forming and welding characteristics allow fabrication of complex shapes without preheating except in thick sections. It is not intended for low-temperature service unless impact-tested, and not recommended for elevated temperatures above 400 °C (750 °F) for prolonged periods.
Product Applications: Vertical and horizontal storage tanks (API 620 / API 650), Low-pressure steam boilers, Liquefied gas storage vessels, Hot water storage cylinders, Air receiver tanks
Processed into products: Vessel shell courses and heads (ellipsoidal, torispherical), Boiler drums and steam piping (limited temperature), Tube sheets and baffle plates, Flanges and manway covers, Structural supports and skirts for vertical vessels
Application industries: Oil & Gas (storage tanks, low-pressure separators), Power Generation (boiler drums, water walls, economizer casings), Chemical & Petrochemical (reactor shells, heat exchanger bodies), Water Treatment (pressure filters, softeners), General Manufacturing (compressed air receivers, autoclaves)
ASTM A285 Grade C Carbon Steel Plate for Pressure Vessels Similar / Substitute Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A516/A516M | Grade 60 | Fine-grain steel with similar strength (TS 415–550 MPa, YS ≥220 MPa); improved toughness for moderate/low temperatures. |
| USA | ASTM A283/A283M | Grade D | Structural carbon steel (TS 400–520 MPa, YS ≥230 MPa); not pressure-vessel certified but mechanically close. |
| Germany (obsolete) | DIN 17155 | HⅡ | Legacy boiler steel with TS 410–530 MPa; replaced by EN 10028-2 but still found in existing equipment. |
| UK (obsolete) | BS 1501-161 | 430A | British pressure vessel steel with TS 430–540 MPa; similar field of application. |
Notes:
- Unless otherwise specified, material is supplied as-rolled. Normalizing may be ordered for improved toughness and uniformity.
- Plates with tensile strength exceeding 65 ksi (450 MPa) require a bend test with a larger bend diameter (2t) to verify ductility.
- Impact testing is not mandatory under ASTM A285; if required, buyer must specify temperature and minimum absorbed energy.
- Weldability: Generally excellent; low carbon equivalent (CE < 0.43) minimizes cold cracking risk. Preheating may be needed for thickness > 50 mm.
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