S355J0W steel and S355J0WP steel are both weathering steel plates, also known as atmospheric corrosion-resistant steel. They belong to a low-alloy steel family positioned between ordinary carbon steel and stainless steel.
Weathering steel is produced by adding small amounts of corrosion-resistant elements such as copper and nickel to plain carbon steel. It combines the strength, toughness, ductility, formability, weldability, wear resistance, high-temperature resistance, and fatigue resistance of high-quality structural steel.
S355J0W steel
Its atmospheric corrosion resistance is approximately 2–8 times higher than that of ordinary carbon steel, and its paintability is about 1.5–10 times better.
In addition, S355J0WP and S355J0W Corten Steel Plate have excellent rust resistance, which helps extend the service life of components, reduce material thickness and consumption, and lower labor and energy costs.
Designation Meaning of S355J0W and S355J0WP
"S": Structural steel
"355": Minimum yield strength of 355 MPa for thickness ≤16 mm
"J": Quality grade related to impact energy requirements
"0": Impact test temperature at 0°C
"W": Indicates atmospheric corrosion resistance (weathering steel)
"P": Indicates a higher phosphorus content grade
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S355J0W & S355J0WP Steel Plate Specifications
| Item | Specification |
|---|---|
| Standard | EN 10025 |
| Delivery Condition | Hot rolled / Normalized / Normalized rolled |
| Through-thickness Property | Z15 / Z25 / Z35 |
| Thickness Range | 8 – 300 mm |
| Width Range | 1600 – 4020 mm |
| Length Range | 6000 – 12000 mm |
Chemical Composition of S355J0W and S355J0WP Steel Plate
| Grade | C | Si | Mn | P | S | Ni | Cr | Mo | Cu |
|---|---|---|---|---|---|---|---|---|---|
| S355J0W | ≤0.16 | ≤0.50 | 0.50–1.50 | ≤0.030 | ≤0.025 | ≤0.65 | 0.40–0.80 | ≤0.30 | 0.25–0.55 |
| S355J0WP | ≤0.16 | ≤0.50 | 0.50–1.50 | 0.07–0.15 | ≤0.025 | ≤0.65 | 0.40–0.80 | ≤0.30 | 0.25–0.55 |
S355J0W
S355J0WP
Mechanical Properties of S355J0W and S355J0WP Steel Plate
| Property | S355J0W | S355J0WP |
|---|---|---|
| Yield Strength (≤16mm) | ≥355 MPa | ≥355 MPa |
| Yield Strength (16–40mm) | ≥345 MPa | ≥345 MPa |
| Yield Strength (40–63mm) | ≥335 MPa | ≥335 MPa |
| Tensile Strength | 470–680 MPa | 470–630 MPa |
| Elongation | ≥22% | ≥22% |
| Impact Energy | ≥27 J (0°C) | ≥27 J (0°C) |
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Cutting Process of S355J0W and S355J0WP Steel Plates
After passing all required inspection and quality testing, S355J0W and S355J0WP weathering steel plates can be processed according to standard cutting and fabrication procedures, including precision cutting and drawing-based blanking.
For steel plates with a thickness of ≤20 mm, CNC plasma cutting or CNC laser cutting is generally preferred, as these methods provide high precision and efficiency.
For thicker plates, typically above 30 mm, CNC flame cutting is commonly used to ensure stable cutting quality, better control of processing accuracy, and improved production efficiency.
Application Range of S355J0W and S355J0WP Steel Plates
S355J0W and S355J0WP weathering steel plates are widely used in structural applications that are exposed to atmospheric conditions for long periods. Typical applications include railways, vehicles, bridges, towers, and other steel structures operating in outdoor environments.
They are also used in the manufacturing of containers, railway wagons, oil drilling rigs, harbor structures, offshore oil production platforms, and chemical and petroleum equipment, especially pressure or structural components exposed to corrosive media such as hydrogen sulfide in industrial environments.
S355J0W steel plate not only improves structural safety and stability but also offers long-term economic benefits, making it an ideal choice for modern steel structure engineering projects. If you need the S355J0W corten steel plate, please feel free to contact us to get quote.
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What is S355J0W used for?
S355J0W weathering steel is widely used in bridges, railway wagons, shipping containers, building façades, landscape structures, outdoor sculptures, and general steel structures exposed to atmospheric conditions, especially in temperate and non-extreme cold regions.
What is the difference between S355J0W and S355J2W?
The main difference is low-temperature impact toughness. S355J0W is tested at 0°C, while S355J2W is tested at -20°C, meaning S355J2W performs better in colder climates. Their strength and corrosion resistance are otherwise very similar.
Does S355J0W steel rust?
Yes, but in a controlled way. S355J0W forms a dense protective rust layer (patina) on its surface, which prevents deeper corrosion. This makes it different from ordinary carbon steel, which continues to corrode without protection.
Does S355J0W need painting?
In most outdoor applications, S355J0W does not require painting. Its natural protective oxide layer reduces the need for coating and maintenance, which helps lower lifecycle costs.
Is S355J0W easy to weld?
Yes. S355J0W has good weldability using standard welding methods such as MAG and arc welding. In most cases, no complex post-weld heat treatment is required.
What environments is S355J0W suitable for?
S355J0W is suitable for temperate and subtropical climates, including urban outdoor structures, bridges, containers, and coastal or high-humidity environments where extreme low-temperature conditions are not present.
How long does S355J0W steel last?
When properly used in suitable environments, S355J0W weathering steel can significantly extend service life compared to normal carbon steel, often lasting several decades with minimal maintenance.
