ASTM A285 Grade C steel plate is a carbon steel pressure-vessel plate specified for fusion-welded vessels where low-to-intermediate strength and straightforward fabrication are required. Grade C is the highest-strength grade within ASTM A285, with a specified tensile-strength range of 55–75 ksi (380–515 MPa) and a minimum yield strength of 30 ksi (205 MPa). The plate is normally supplied in the as-rolled condition and is used for pressure-vessel shells, storage tanks, boiler components and other welded pressure-containing equipment where moderate strength is sufficient and higher-strength pressure-vessel grades are not required.
The steel plate under ASTM A285 ranges in three grades, A, B and C, most common use is ASTM A285 Grade C plates. Which shall be made by killed, semi-killed, capped or rimmed steel practices at manufacturer's option.
Key Properties:
- Chemical Composition: ASTM A285 plates are made up of carbon, manganese, phosphorus, and sulfur, with specific limits placed on these elements to achieve desired mechanical qualities.
- Mechanical Properties:
- Yield Strength: Typically ranges from 138 MPa (20,000 psi) for Grade A to around 245 MPa (35,000 psi) for Grade C.
- Tensile Strength: Approximately 310 MPa (45,000 psi) to 450 MPa (65,000 psi), depending on the specific grade.
- Elongation: Minimum elongation values can reach up to 21% in a 200 mm gauge length, indicating reasonable ductility.
Applications:
ASTM A285 steel plates are commonly used in:
- Manufacturing of pressure vessels for oil and gas industries.
- Construction of storage tanks and boilers.
- Structural applications that require good weldability and moderate strength.
- General fabrication where high strength is not a primary requirement.
In summary, ASTM A285 steel plates provide a versatile and economical solution for various applications in the industrial and structural sectors, particularly when low to intermediate strength is sufficient.
Referenced Standard
For killed carbon steels only refer to below ASTM specifications.
- A 299/A 299M: Carbon steel manganese silicon pressure vessel plates.
- A 515/A 515M: Carbon steel for intermediate and higher temperature services of pressure vessel plates.
- A516/A516M: Carbon steel for moderate and lower temperature pressure vessel plates.
Maximum thickness of plates is limited to 50 mm [2 inch] for all grades.
Referenced Documents:
ASTM Sandards:
- A20/A20M: General requirements for steel plates for pressure vessels.
General Requirements and Ordering Information:
- Testing and retesting methods, procedures, dimension tolerance, mass, quality and repair defects, marking, loading and ordering information shall comply with A20/A20M.
- In additional to basic requirements, certain supplementary requirements are available.
- Coils are excluded from A285 until they have been cutted to plate.
ASTM A285 Grade C Steel Plate Data Sheet
Chemical Composition:
Elements | Composition, % | ||
|---|---|---|---|
Grade A | Grade B | Grade C | |
Carbon, maxA | 0.17 | 0.22 | 0.28 |
Manganese, max Heat analysis | 0.90 | 0.90 | 0.90 |
Product analysis | 0.98 | 0.98 | 0.98 |
Phosphorus, maxA | 0.025 | 0.025 | 0.025 |
Sulfur, maxA | 0.025 | 0.025 | 0.025 |
Mechanical Properties:
Grade A | Grade B | Grade C | ||||
|---|---|---|---|---|---|---|
ksi | [MPa] | ksi | [MPa] | ksi | [MPa] | |
Tensile strength | 45-65 | [310-450] | 50-70 | 345-485 | 55-75 | 380-515 |
Yield strength, minA | 24 | [165] | 27 | [185] | 30 | [205] |
Elongation in 8 in. or [200 mm], min, %B | 27 | 25 | 23 | |||
Elongation in 2 in. or [50 mm], min, %B | 30 | 28 | 27 | |||
A Determined by either the 0.2% offset method or the 0.5% extension under load method.
B See Specification A20/A20M for elongation adjustment.
Our Supply Range:
Description: Carbon Steel ASTM A285 Grade C & B & A
Manufacturing Types: Hot Rolled
Thickness: 2 to 150 mm
Width: 0.6m to 3m
Length: 6m, 12m, customized
Surface: Natural, Painted
Packing: Standard sea packing, bundled with streel strip.
FAQ
Q1: Does ASTM A285 Grade C have a fixed maximum plate thickness of 50 mm?
A:1 No. ASTM A285/A285M-24 limits maximum thickness by the ability of the material composition to meet the specified mechanical properties. Commercial plate availability should be confirmed separately.
Q2: Is Charpy V-notch impact testing mandatory for ASTM A285 Grade C plate?
A2: No. Charpy testing is not a basic A285 Grade C requirement. When notch toughness is required, the test temperature, minimum energy and applicable supplementary requirement must be specified.
Q3: Can ASTM A285 Grade C plate be produced from coil?
A3: Yes. Plate produced from coil may require additional testing and reporting under ASTM A20/A20M before compliance with the finished-plate requirements is established.
Q4: Can ASTM A285 Grade C be substituted directly for ASTM A516 steel plate?
A4: No. A285 Grade C and A516 have different service and toughness bases. Any substitution must be checked against the vessel design code, required notch toughness and project specification.
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