JIS G 3125 SPA-C steel plates exhibit excellent resistance to atmospheric corrosion, comparable to ASTM Corten A steel and Chinese weathering steel grade 09CuPCrNi-A.

Due to this outstanding weathering performance, SPA-C steel plates are extensively applied in air preheaters, economizers, railway rolling stock, bridge structures, container manufacturing, and various construction projects.
Chemical Composition of JIS G 3125 SPA-C Steel Plates
| Grade | C ≤ | Si | Mn | P | S ≤ | Cu | Cr | Ni ≤ |
|---|---|---|---|---|---|---|---|---|
| SPA-C | 0.12 | 0.25–0.75 | 0.20–0.50 | 0.070–0.150 | 0.040 | 0.25–0.60 | 0.30–1.25 | 0.65 |
Mechanical Properties of JIS G 3125 SPA-C Steel Plates
| Grade | Yield Strength | Tensile Strength | Elongation |
|---|---|---|---|
| SPA-C | ≥ 325 MPa | ≥ 450 MPa | ≥ 26% |
As a well-established supplier and exporter of JIS G 3125 SPA-C steel plates in China, BBN Steel offers stable quality assurance and competitive pricing.
With regular inventory available in our warehouse, SPA-C steel plates can be delivered promptly. In addition, our dedicated logistics team ensures efficient shipment and on-time delivery.
Gnee is a professional exporter and stockholder of JIS G 3125 SPA-C weathering steel plates in China. We maintain a monthly stock exceeding 1,000 tons to meet urgent customer requirements.
For the latest SPA-C steel plate pricing, please feel free to contact us. Any inquiries regarding chemical composition, mechanical properties, or supply conditions are warmly welcomed via email or phone.

What is SPA-C corten weathering steel plate equivalent grades
The equivalent grades of SPA-C corten weathering steel plate include HW350, SPA-H JIS G3125, ASTM A242 (COR-TEN A), ASTM A588 (COR-TEN B), S355J2WP+N, S355J2W+N, S355JOWP, S355JOW, S355J2W, 1.8946, 1.8965, SAILCOR IRSM41-97.
What is SPA-C weathering steel?
SPA-C is a type of atmospheric corrosion-resistant steel (Corten steel) designed for long-term outdoor exposure. It forms a stable, protective rust layer that prevents further corrosion, reducing maintenance needs.
What are the main applications of SPA-C steel?
SPA-C is commonly used for architectural facades, outdoor sculptures, bridges, retaining walls, garden landscapes, and industrial equipment where durability and aesthetics are important.
Can SPA-C steel be welded or processed?
Yes. SPA-C can be cut, welded, bent, and formed using standard steel processing methods. Preheating may be recommended for thick plates to avoid welding cracks.
Where can I buy SPA-C steel?
SPA-C steel is available from specialized steel suppliers and distributors. GNEE offers a wide range of SPA-C products in various sizes and forms.







