Products Overview
JIS G3125 SPA-C steel is a high-performance weathering steel, designed to offer excellent atmospheric corrosion resistance and mechanical properties.
It is composed primarily of carbon steel with small amounts of copper, nickel, phosphorus, and other alloying elements. These additions enhance its strength, durability, and corrosion resistance, making SPA-C steel suitable for demanding structural and industrial applications.
Products Specifications
Thickness: 6 mm – 300 mm
Width: 1500 mm – 4050 mm
Length: 3000 mm – 15000 mm
The steel is available in hot-rolled, cold-rolled, normalized, thermomechanically controlled (TMCP), quenched and tempered (QT), or as-rolled (AR/CR) conditions depending on customer requirements.
Chemical Composition (Typical, %)
Carbon (C): ≤ 0.12
Silicon (Si): 0.25 – 0.75
Manganese (Mn): 0.20 – 0.50
Phosphorus (P): 0.070 – 0.150
Sulfur (S): ≤ 0.040
Copper (Cu): 0.25 – 0.60
Chromium (Cr): 0.30 – 1.25
Nickel (Ni): ≤ 0.65
Mechanical Properties
Yield Strength: ≥ 325 MPa
Tensile Strength: ≥ 450 MPa
Main Application
Construction & Infrastructure:
JIS G3125 SPA-C weathering steel plates are widely used in bridges, building facades, exterior walls, and roofs. The steel's excellent atmospheric corrosion resistance and structural strength make it ideal for main girders, support beams, cladding panels, and roof structures, reducing maintenance requirements while extending the service life of buildings and infrastructure. The natural rust patina also provides a distinctive architectural appearance, combining functionality with aesthetic value.
Marine Engineering:
SPA-C steel plates are highly suitable for marine applications, including ship structures, offshore platforms, and dock facilities. Their superior resistance to seawater corrosion and harsh weather conditions ensures long-term durability for hull components, decks, piers, cranes, and other port equipment. This makes SPA-C steel an excellent choice for projects exposed to tidal, saline, and highly corrosive environments.
Railway & Transportation:
In the railway and transportation sector, SPA-C steel plates are used to manufacture railway carriages, high-speed rail structures, and tunnels. The steel provides high strength, toughness, and corrosion resistance, enabling structural frames, lining plates, and bridge components to withstand dynamic loads and environmental exposure. This ensures safety, reliability, and longevity for transit systems.
Containers & Industrial Equipment:
SPA-C steel plates are extensively used in storage tanks, pipelines, air preheaters, and economizers in industrial settings. Their high corrosion resistance, combined with strength and durability, makes them suitable for chemical tanks, fuel storage, power plant components, and industrial machinery parts. SPA-C steel can withstand repeated thermal cycles, mechanical wear, and exposure to corrosive media, making it ideal for long-term industrial operations.
Decorative & Landscape Applications:
The naturally developing rust patina of SPA-C steel makes it popular in garden landscaping, outdoor sculptures, and architectural features. It is used for planters, fences, pergolas, and wall panels, providing weather-resistant functionality while enhancing visual appeal. Designers and architects value SPA-C steel for its combination of durability, low maintenance, and industrial aesthetic that evolves over time.
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.
