What is SA 285 Grade C equivalent to?
SA258 Grade C is a carbon steel plate specification under the ASME Boiler and Pressure Vessel Code (Section II, Part A). It is designed for moderate elevated temperature service, specifically in applications such as industrial heating equipment and certain boiler components.
SA-285 Grade C is a carbon steel plate for pressure vessels. Its "equivalent" depends on the context-specification system, application, or performance.
1. Direct Cross-Standard & Near-Identical Equivalents
ASTM: A285 Grade C is the direct ASTM designation. SA-285 is simply the ASME Boiler and Pressure Vessel Code adoption of ASTM A285.
International (Close Performance/Application):
EN 10028-2: P265GH is a very close European equivalent for pressure vessel use at ambient and elevated temperatures.
JIS G3115: SPV235 (though SPV235 is slightly lower in strength; SPV315 is closer in strength).
Common Name: "Firebox Quality" carbon steel plate for low to moderate temperature pressure vessels.
2. Performance-Based / Application Equivalents (Common Substitutes)
These are materials commonly used for the same types of applications (general-purpose, low to moderate temperature pressure vessels and tanks).
| If you need this from A285 Gr. C... | Common Substitute/Equivalent... |
|---|---|
| General Pressure Vessel Plate | A516 Gr. 60 or Gr. 65 – This is the most common modern substitute. A516 offers better internal quality, notch toughness, and is more readily available. |
| Higher Temperature Service | A515 Gr. 60 or Gr. 65 – Specifically for moderate elevated temperature service (e.g., fireboxes, shells). |
| Lower Cost / Less Critical | A36 – For non-code, structural, or less critical applications where pressure vessel certification is not required. |
3. Key Comparison: SA/A285 Grade C vs. A516 Grade 60/65
| Property | SA/A285 Grade C | A516 Grade 60/65 |
|---|---|---|
| Tensile (ksi) | 55-75 | 60-80 / 65-85 |
| Yield Min (ksi) | 30 | 32 / 35 |
| Primary Use | General purpose pressure vessels, tanks, low-temperature applications. | Industry standard for pressure vessels, especially where notch toughness is required. |
| Toughness | Impact testing not mandatory (can be specified). | Impact testing often specified/required (e.g., at -20°F / -32°C for Gr. 65). |
| Modern Preference | Less common, considered a legacy grade. | Preferred and ubiquitous in new construction. |
4. Important Cautions on "Equivalency"
Never substitute without engineering review. "Equivalent" does not mean interchangeable.
Governing Code is Law: The design code (ASME BPVC Section VIII) lists allowable stresses for each material. Substitution requires recalculation.
Toughness is Critical: A285 Gr. C has no mandatory impact properties. Substituting with A516 Gr. 65 (which often includes impact testing) provides a major safety benefit for low-temperature operation.
Availability: A516 is far more readily available globally than A285.
Summary of Best-Practice Equivalent
For most practical purposes, ASTM A516 Grade 60 or Grade 65 is the functional modern equivalent and superior successor to SA/A285 Grade C. It is stronger, more consistently available, and offers guaranteed toughness.
When specifying or sourcing, always use the full designation: "ASME SA-285 Grade C" or "ASTM A285 Grade C," and clarify if impact testing is required to match the intended service temperature. This allows a supplier or fabricator to propose the correct, locally approved equivalent if necessary.
Chemical composition of Product analysis for SA285 Grade C pressure vessel steel plate (Max %)
|
Steel Grade |
Main chemical composition of A285 Grade C |
||||
|
C |
Si |
Mn |
P |
S |
|
|
A285 Grade C |
0.28 |
0.08-0.45 |
0.98 |
0.035 |
0.035 |
Tensile Requirements
| SA 285 Gr A ksi(MPa) |
SA 285 Â Gr B ksi (MPa) |
SA 285 Gr C ksi (MPa) |
|
|---|---|---|---|
| Tensile strength | 45-65 (310-450) | 50-70 (345-485) | 55-75 (380-515) |
| Yield strength, min | 24 (165) | 27 (185) | 30 (205) |
| Elongation in 8Â in. or (200Â mm), min, % | 27 | 25 | 23 |
| Elongation in 2Â in. or (50Â mm), min, % | 30 | 28 | 27 |
1.What is SA258 Grade C?
SA258 Grade C is a carbon steel plate specification for pressure vessels, primarily used in industrial heating applications like fireboxes and superheater supports, designed for moderate elevated temperature service.
2.What is the chemical composition of SA258 Grade C?
Its composition is primarily carbon steel with controlled levels of Carbon (max 0.20%), Manganese (0.40-0.80%), Silicon (0.10-0.30%), and limited Phosphorus and Sulfur.
3.What are the mechanical properties of SA258 Grade C?
For plates up to 0.5 inches thick, it has a minimum tensile strength of 55-75 ksi (380-515 MPa) and a minimum yield strength of 30 ksi (205 MPa).
4.Is SA258 Grade C a carbon steel or alloy steel?
SA258 Grade C is classified as a carbon steel, as it does not contain significant intentional additions of alloying elements like chromium or molybdenum.
5.What is the primary application of SA258 Grade C?
Its primary use is in the fabrication of fireboxes, furnace supports, and similar components in boilers and heaters where temperatures are moderately elevated but oxidation resistance is less critical.
6.What is the maximum service temperature for SA258 Grade C?
It is typically used for service temperatures up to approximately 800°F (427°C), primarily in non-corrosive, low-stress support applications.
7.How does SA258 Grade C differ from SA258 Grade A and B?
The grades differ primarily in strength levels. Grade C offers higher tensile strength (55-75 ksi) compared to Grade A (47-67 ksi) and Grade B (50-70 ksi), with slight variations in chemistry.
8.Can SA258 Grade C be welded?
Yes, it has good weldability typical of low-carbon steels. Standard welding practices for carbon steel are generally applicable.
9.Does SA258 Grade C require impact testing?
Impact testing is not a mandatory requirement of the base specification but can be specified as an additional requirement by the purchaser if needed for the application.
10.Is SA258 Grade C suitable for pressure vessel shells?
While it is a pressure vessel quality plate, its typical use is more specialized for internal support structures in high-temperature environments rather than primary pressure-retaining shells in modern construction.
Full specification and details are available on request. The above information is provided for guidance purposes only. For specific design requirements please contact our technical sales staff.
