SA 285 Gr.C is a low- to intermediate-strength carbon steel plate used mainly for welded pressure vessels and other pressure-containing components operating at low or moderate temperatures and pressures. It is listed in ASME Section II (SA-285) and corresponds to ASTM A285 Grade C, where Grade C represents the highest strength among the three grades (A, B, C) in this specification.
It is valued for its good weldability and formability, making it suitable for fabricating tanks, vessel shells, heads, and certain heat exchanger components in general industrial, petrochemical, and process applications where more highly alloyed steels are not required.
Chemical Composition
|
Element |
Composition (%) |
|---|---|
|
Carbon (C) |
0.24 max |
|
Manganese (Mn) |
0.90 max |
|
Phosphorus (P) |
0.035 max |
|
Sulfur (S) |
0.035 max |
Mechanical Properties of ASME SA285 Gr C
|
Property |
Value |
|---|---|
|
Tensile Strength |
55-75 ksi (380-515 MPa) |
|
Yield Strength |
30 ksi (205 MPa) min |
|
Elongation (in 50mm) |
27% min |
applications
Pressure vessels:
These plates are primarily used in the fabrication of pressure vessels, such as boilers, tanks, and reactors, where they can withstand moderate pressure and temperature conditions. Their good weldability and formability make them a cost-effective choice for shells, heads, and other pressure-containing parts in a wide range of industrial sectors.
Heat exchangers:
They are suitable for constructing certain types of heat exchangers, particularly those operating at moderate temperatures. Their favorable thermal conductivity and ability to be easily formed into shells and tubesheets make them a practical option for many general-purpose heat exchanger applications.
Storage tanks:
ASME SA 285 Grade C plates are widely used in the manufacturing of storage tanks for liquids and gases. They are commonly specified for tanks handling oil products, chemicals, water, and other non-corrosive or mildly corrosive media in refineries, chemical plants, and industrial facilities.
Process equipment:
These plates are used in the fabrication of process equipment, including piping, valves, and fittings, in chemical and petrochemical industries. They are often chosen for their reliability and ease of fabrication in moderate-pressure process systems.
Power generation:
They are employed in the construction of components in power plants, such as certain boiler sections, steam generators, and auxiliary pressure equipment. Their strength and durability make them suitable for various non-severe service applications within power generation facilities.
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.
What is SA 285 Gr.C?
SA 285 Gr.C is a low- to intermediate-strength carbon steel plate for welded pressure vessels, approved by ASME (SA-285) and corresponding to ASTM A285 Grade C. It is used mainly for low/moderate pressure and temperature service.
What are the key properties of SA 285 Gr.C?
It provides good weldability, good formability, and moderate strength, with cost-effective performance for non-severe service conditions.
What is the typical application range for SA 285 Gr.C?
It is commonly used for pressure vessel shells and heads, storage tanks, heat exchanger shells/tubesheets (moderate service), and general process equipment in chemical, petrochemical, and industrial plants.
What welding processes are suitable for SA 285 Gr.C?
Common processes such as SMAW, GMAW, FCAW, and SAW are typically suitable. Preheat or post-weld heat treatment (PWHT) may be needed for thicker plates or highly restrained joints.
Does SA 285 Gr.C require heat treatment?
It is often supplied in as-rolled or normalized condition. PWHT is not always required but may be specified based on thickness, welding procedure, and design code requirements (e.g., stress relief).
How does SA 285 Gr.C compare to SA 285 Gr.A and Gr.B?
SA 285 Gr.C is the highest strength grade among A/B/C. Gr.A is the lowest strength, Gr.B is intermediate, and Gr.C offers the best combination of strength and formability for more demanding moderate-service pressure vessel parts.
How does SA 285 Gr.C compare to SA 387 (Cr-Mo) steels?
SA 285 Gr.C is a carbon steel for low/moderate temperatures. SA 387 grades are chromium-molybdenum alloy steels designed for higher temperatures and often better resistance to hydrogen attack and creep, making them suitable for refinery and power plant high-temperature service where SA 285 Gr.C would not be appropriate.
How does SA 285 Gr.C compare to A516 (e.g., A516 Gr.70)?
SA 285 Gr.C is generally lower strength and intended for less severe pressure/temperature service. A516 grades (like Gr.70) are pressure vessel steels optimized for improved toughness, especially at lower temperatures, and are often preferred for colder or more critical applications where impact performance matters.
What is the corrosion resistance of SA 285 Gr.C?
It has moderate corrosion resistance, suitable for non-corrosive or mildly corrosive media. In aggressive environments, additional protection (coatings, linings) or higher-alloy materials are typically required.
When should I choose SA 285 Gr.C vs. a higher-strength or alloy steel?
Choose SA 285 Gr.C for cost-sensitive, moderate-pressure, moderate-temperature welded pressure vessels and tanks where toughness at low temperatures or high-temperature creep resistance is not a primary requirement. Choose higher-strength or alloy steels when higher pressure, lower temperature toughness, higher temperature service, or better corrosion/creep resistance is needed.