SPA-C High Strength Weathering Steel Plate

 

SPA-C Weathering Steel Plate is a high-strength atmospheric corrosion-resistant steel that conforms to the Japanese Industrial Standard JIS G3125.

SPA – "Steel for resistant atmospheres," indicating its excellent corrosion resistance

 

C – Denotes the specific chemical composition containing copper, chromium, and nickel for enhanced durability

 

 

When exposed to the atmosphere, SPA-C Weathering Steel Plate forms a stable, rust-like patina on the surface, which serves as a protective barrier against further corrosion.

 

This eliminates or greatly reduces the need for painting or other protective coatings, making it ideal for long-term outdoor applications.

 

 

 

 

Element	C ≤	Si	Mn	P	S	Cr	Ni ≤	Cu
Content	0.12	0.25–0.75	0.20–0.50	0.07–0.15	0.04	0.30–1.25	0.65	0.25–0.65

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Grade	Plate Thickness	Yield Strength	Tensile Strength	Elongation
SPA-C	–	≥ 325 MPa	≥ 450 MPa	≥ 26%

 

Although SPA-C Weathering Steel Plate generally does not require heat treatment due to its inherent corrosion resistance, specific applications may require additional processing:

 

Normalizing – Improves toughness and refines grain structure

 

Quenching – Increases hardness and strength

 

Tempering – Reduces brittleness and improves ductility

 

Post-Weld Heat Treatment (PWHT) – Relieves residual stress after welding

 

Custom Treatments – Designed for special engineering performance needs

 

 

 

High Atmospheric Corrosion Resistance – Self-protective rust layer extends service life

 

Excellent Mechanical Strength – Maintains stability under high loads

 

Good Weldability & Formability – Suitable for complex fabrication projects

 

Low Maintenance – Minimal need for painting or coatings in most environments

 

 

SPA-C Weathering Steel Plate is widely used in structures requiring both strength and resistance to atmospheric corrosion, such as:

 

Bridges and overpasses

 

Building facades and roofing

 

Railway rolling stock

 

Shipping containers

 

Towers, poles, and outdoor sculptures

 

Industrial machinery housings

 

 

Standard: JIS G3125

Thickness: Customizable

Width & Length: According to client requirements

Supply Condition: As Rolled (AR), Normalized (N), or TMCP

Testing Options: Ultrasonic Testing, Charpy Impact Test, Third-Party Inspection (SGS, etc.)

Packing: Standard export seaworthy packing

 

Contact now to fet SPA-C Corten Steel Plate Quote

 

What is SPA-C steel plate?

SPA-C steel plate is a type of weathering steel produced according to the Japanese standard JIS G3125. It contains alloying elements such as copper, chromium, and nickel, which allow the steel to form a protective rust layer on the surface when exposed to the atmosphere. This protective layer helps prevent further corrosion and significantly extends the service life of the steel.

 

Does SPA-C steel need painting or coating?

In most outdoor environments, SPA-C steel does not require painting. The steel forms a stable oxide layer (patina) that protects the material from further corrosion.

However, in extremely corrosive environments such as marine or chemical industrial areas, additional protective coatings may be recommended.

 

How long does it take for SPA-C steel to develop the protective rust layer?

Under normal atmospheric conditions, SPA-C steel typically begins forming a stable protective patina within several months to two years, depending on environmental factors such as humidity, rainfall, and air pollution.

Once the patina is fully developed, the corrosion rate decreases significantly.

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