JIS G3125 SPA-C Steel Plates

High-corrosion-resistance weathering steel plate engineered to develop a tightly adherent, protective oxide layer when exposed to atmospheric conditions. Conforming to JIS G3125 SPA-C, these hot-rolled flat plates combine enhanced atmospheric corrosion resistance with good formability and weldability, making them suitable for outdoor structural applications where long-term performance is required without continuous painting.

Key features

• Meets JIS G3125 SPA-C chemical and metallurgical requirements (weathering/alloy structural steel).
• Corrosion protection through alloying elements (notably Cu, Cr and other trace elements) that promote formation and regeneration of a stable rust layer.
• Good weldability and mechanical behavior for typical structural uses.
• Supplied as hot-rolled flat plates; commonly available in widths of 600 mm and above and in a variety of thicknesses and lengths to customer specification.

Common equivalent grades

• ASTM A242 (COR-TEN A)
• ASTM A588 (COR-TEN B)
• EN S355J2WP / S355J2W and related weathering steel grades

Typical applications

• Bridges and structural steelwork exposed to the atmosphere
• Railway carriages and transport containers
• Air preheaters, economizers and other HVAC/heating equipment
• Outdoor storage tanks, signage, cladding and architectural elements

Supply and quality

• Available cut-to-length, edge-trimmed or with customer-specific processing.
• Mill inspection and test reports available on request to confirm chemical composition and mechanical properties per JIS G3125 requirements.
• Packaging for export and overland shipment; conditioning and surface protection options available depending on the application.

Ordering notes

• Provide required thickness, length, quantity and any processing (cutting, welding, surface treatment) when requesting a quotation.
• Lead times vary with quantity and processing; contact your procurement channel on the marketplace to request an RFQ and delivery schedule.