What is SA588 Grade C Steel Plate?
SA588 Grade C steel plate is a high-strength, low-alloy weathering steel designed to resist atmospheric corrosion while maintaining excellent mechanical properties.
Known for its self-protecting rust patina, it is widely used in structural applications, outdoor construction, and industrial projects. Its corrosion resistance allows for reduced maintenance, while its high strength ensures durability in demanding applications.
Key Features:
Minimum Yield Strength: 345 MPa (for thickness ≤100 mm)
Maximum Thickness: 200 mm (varies by supplier and production capability)
Corrosion Resistance: Forms a protective rust layer in atmospheric exposure
Fabrication-Friendly: Suitable for welding, cutting, bending, and rolling
Versatile Applications: Bridges, marine structures, containers, tanks, facades, rail wagons, and outdoor sculptures
Delivery Conditions
Hot Rolled (HR)
Cold Rolled (CR)
Normalized (N)
Quenched and Tempered (Q+T)
Thermal Mechanical Control Process (TMCP)
Electroslag Remelting (ESR)
Optional tests: HIC, Impact Test, Charpy V-Notch
Grade and Specification
| Item | Specification |
|---|---|
| Material Type | Carbon Steel / Weathering Steel |
| Standard | ASTM A588, A242, SA588/SA588M |
| Grades | SA588 Grade A, B, C / A588 Grade A, B, C / Corten A, Corten B / S355J0WP, S355J0W, S355J2W |
| Thickness | 6 mm – 200 mm |
| Width | 1500 mm – 4050 mm |
| Length | 3000 mm – 15000 mm |
| Surface Treatment | Black painted, PE coated, Galvanized, Color coated, Anti-rust varnish, Oiled, Checkered, etc. |
| Packing | Standard export seaworthy packing or customized per client requirement |
| Export Markets | Middle East, South Asia, Southeast Asia, South America, Europe, Australia, Africa |
Chemical Composition
| Element | Max / Range (%) |
|---|---|
| C | 0.15 |
| Si | 0.15 – 0.40 |
| Mn | 0.80 – 1.35 |
| P | 0.04 |
| S | 0.05 |
| Ni | 0.25 – 0.50 |
| Cu | 0.20 – 0.50 |
| Cr | 0.30 – 0.50 |
| V | 0.01 – 0.10 |
| Mo | Trace |
Carbon Equivalent (Ceq) Formula:
Ceq=C+Mn6+Cr+Mo+V5+Ni+Cu15%Ceq = C + \frac{Mn}{6} + \frac{Cr + Mo + V}{5} + \frac{Ni + Cu}{15} \%Ceq=C+6Mn+5Cr+Mo+V+15Ni+Cu%
Mechanical Properties
| Thickness (mm) | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) |
|---|---|---|---|
| ≤100 | 345 | 485 | 21 |
| 100–125 | 315 | 460 | 20 |
| 125–200 | 290 | 435 | 18 |
Impact Test: Optional, depending on project requirements.
Typical Applications
SA588 Grade C steel plate is widely used for:
Structural Steelwork: Bridges, highways, towers
Marine Applications: Shipbuilding, offshore structures
Containers & Tanks: Storage tanks, shipping containers, pressure vessels
Architectural & Decorative: Corten facades, outdoor sculptures, building cladding
Rail Industry: Rail wagons, frames, and components
Packing & Shipping
Each order is packaged according to client specifications: wooden crates, beds, or bulk packaging.
Documentation and shipping comply with international standards.
Loading ports: Shanghai, Tianjin, Qingdao (or as per client request)
Delivery: 30–50 days for bulk orders; 7 days for stock goods
Minimum Order Quantity (MOQ): 1 piece
SA588 Grade C steel plate is a durable, corrosion-resistant weathering steel suitable for heavy-duty structural, marine, and architectural applications.
Its combination of high strength, weldability, and low maintenance requirements makes it a reliable choice for both functional and decorative projects.
