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S355J2W Weathering Steel Plate (Corten Steel Plate)

Q: What is the service life of weathering steel?

Inland, dry environments: 50+ years (maintenance-free); industrial/suburban environments: 30–50 years; coastal areas with low salt spray: 15–25 years (additional corrosion protection required in areas with high salt spray).

Q: Can weathering steel be used in coastal areas or environments with high salt spray levels?

Use with caution. In environments with high salt spray levels or high chloride ion concentrations, the rust layer on standard weathering steel is easily penetrated, accelerating corrosion and potentially leading to pitting or perforation.

Q: What are the welding properties of weathering steel?

It has good welding properties and can be welded using conventional processes such as manual arc welding and gas shielded arc welding.

Q: Does weathering steel require painting?

In normal atmospheric conditions (urban or rural), painting is not required; a stable passivation layer will form after 6–18 months of exposure, providing a corrosion resistance lifespan of 80–100 years.High-humidity / highly corrosive environments (coastal areas, industrial acid rain, salt spray zones): It is recommended to apply a thin coat of weathering primer initially or to carry out regular maintenance to prevent the early loss of the rust layer.Concealed / damp, poorly ventilated areas: Waterproofing and anti-corrosion coating must be applied to prevent localised rusting from worsening.

Q: How long does it take for a rust layer (oxidation layer) to form on weathering steel?

The rate at which the oxidation layer forms depends on climatic conditions. In outdoor environments with significant fluctuations between dry and wet conditions, it typically takes between six months and two years for a stable, dark brown protective layer to form. During the initial stage, rust streaks may form, so care should be taken to protect the surrounding building surfaces.

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EN 10025-5 S355J2W Weathering Steel Plate (Corten Steel Plate) is a high-performance structural steel plate that integrates high strength, good low-temperature toughness, excellent atmospheric corrosion resistance, and weldability. It is an ideal choice for achieving outdoor structures that are paint-free, low-maintenance, and long-lasting.

Standard :
EN10025-5
Grade :
S355J2W
Thickness :
6.0 - 200.0 mm
Width :
1500.0 - 4050.0 mm
Length :
3000.0 - 15000.0 mm

Special thickness, width, and length can be negotiated separately.
We also provide customized processing services.If you have any questions, please contact us.

Overview

EN 10025-5 S355J2W is a cost-effective, weldable weathering structural steel, commonly referred to as "weathering steel" or "Corten steel."

Its core characteristic is that, when exposed to the atmosphere, it forms a dense and adherent protective rust layer ("Patina") on its surface. This layer effectively slows down further corrosion, providing corrosion resistance that is 4 to 6 times greater than that of ordinary carbon steel in most atmospheric environments.

Its key advantages are "corrosion resistance + high strength + low maintenance," making it particularly suitable for structural components intended for long-term outdoor use. It significantly reduces painting and maintenance costs while meeting toughness requirements in low-temperature environments.

It is an ideal material choice for modern architectural design, bridge engineering, and outdoor structures that prioritize long service life, low maintenance, and distinctive aesthetic effects. When selecting this material, it is essential to ensure it meets the standard requirements of the project location and to follow proper processing and installation guidelines.

Grade	S355J2W
Standard	EN10025-5 (Hot rolled products of structural steels - Part 5: Technicaldelivery conditions for structural steels with improved atmospheric corrosion resistance)
Delivery Conditions	As Rolled (+AR), Normalized (+N) or Thermomechanically Rolled (+M)
Core Advantages	Excellent atmospheric corrosion resistance (4 - 6 times higher than ordinary carbon steel), high strength, low temperature toughness at -20°C and low maintenance cost.
Weldability	Good weldability, conventional welding methods (such as MAG, SMAW, etc.) are typically employed without the need for preheating. Matching weathering steel electrodes should be selected to avoid compromising the weather resistance of the joint.
Machinability	Good performance in cold bending, stamping, and cutting.
Quality Control	Provide the material certificate. If required, Charpy V-notch impact test, and Z-direction property test (Grades Z15/Z25/Z35) can be added.
Application Scenarios	Bridge Engineering, Building Structures, Power Facilities, Transportation Equipment, Landscape Sculpture, etc. for outdoor environments as low as -20°C

Key Features and Advantages

1. Excellent Atmospheric Corrosion Resistance: This is its most prominent feature. The addition of small amounts of alloying elements such as copper, chromium, and nickel promotes the formation of a stable rust layer on the surface.

2. High Strength: Yield strength ≥355 MPa, tensile strength between 470–630 MPa, offering excellent load-bearing capacity.

3. Good Low-Temperature Toughness: Meets impact energy requirements at -20°C (≥27 J), making it suitable for outdoor structures in low-temperature service environments.

4. Weldability: The chemical composition of the steel is optimized for good weldability. However, it generally requires the use of compatible dedicated welding materials and may need to follow specific Welding Procedure Specifications (WPS).

5. Paint-Free or Reduced Maintenance: In many application scenarios, it can be used without painting, allowing natural rusting to form a protective layer, thereby significantly reducing lifecycle maintenance costs. It can also be painted to provide longer-lasting protection.

Chemical Composition

Grade	S355J2W
Element	C	Si	Mn	P	S	N	Addition of nitrogen binding elements	Cr	Cu
Content (max, %)	0.16	0.50	0.50 - 1.50	0.030	0.030	-	yes	0.40 - 0.80	0.25 - 0.55

Carbon Equivalent of S355J2W Weathering Steel Plate (Corten Steel Plate)

Carbon Equivalent: CEV ≤ 0.52%

Calculate using the International Institute of Welding (IIW) formula: CEV = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15

Mechanical Properties

Grade	Thickness (t) [mm]	Yield Strength (ReH) [min, MPa]	Tensile Strength (Rm) [MPa]	Elongation (A) [min, %]	Impact Energy (KV) [min]
S355J2W	t ≤ 16	355	470 - 630	22	27J (at -20°C, Longitudinal)
	16 < t ≤ 40	345	470 - 630	22	27J (at -20°C, Longitudinal)
	40 < t ≤ 63	335	470 - 630	21	27J (at -20°C, Longitudinal)
	63 < t ≤ 80	325	470 - 630	20	27J (at -20°C, Longitudinal)
	80 < t ≤ 100	315	470 - 630	20	27J (at -20°C, Longitudinal)
	100 < t ≤ 150	295	450 - 600	18	27J (at -20°C, Longitudinal)

Applications

Due to its maintenance-free nature, high strength, and unique appearance, S355J2W Weathering Steel Plate (Corten Steel Plate) is widely used in building and engineering structures exposed to the atmosphere:

1. Architectural structures: Exposed steel structures of large public buildings (such as stadiums, art galleries, railway stations, airport terminals), bridges, transmission towers, roofs, and curtain wall support structures.

2. Bridge engineering: Particularly suitable for landscape bridges, pedestrian bridges, highway bridges, and railway bridges, reducing lifecycle maintenance costs and construction disruptions.

3. Tower structures: Power transmission towers, communication towers, wind turbine towers (non-rotating components, such as tower platforms).

4. Sculptures and art installations: Many modern sculptures and public artworks utilize its rust-colored appearance as a design element.

5. Containers and railway freight vehicles: Used in the manufacturing of transportation equipment with high durability requirements.

6. Other outdoor structures: Such as lighting poles, railings, noise barriers, scaffolding, etc.

Other Information

Usage Precautions

1. Initial Rusting Stage: Before a stable protective rust layer forms (which typically takes about 1–3 years, depending on the environment), rust runoff from the steel surface may contaminate surrounding concrete or walls. Design considerations should include drainage or protective measures.

2. Unsuitable for Specific Environments: In continuously damp environments, areas with chloride ions (e.g., coastal salt spray, de-icing salts), or high sulfur dioxide levels (e.g., severe industrial pollution), the corrosion resistance advantage may diminish, and uneven corrosion may even occur. Evaluation or additional protective measures are required.

3. Welding and Processing: Although it has good weldability, appropriate welding materials (typically those matching the weathering resistance of the base material) and suitable welding techniques must be selected during welding to maintain the corrosion resistance and mechanical properties of the weld area.

4. Surface Treatment: To accelerate the formation of a stable rust layer, "rust stabilizers" (also known as "rust promoters") can be used.

Key Differences Between Similar Grades

Grade	Yield Strength (MPa)	Impact Temperature	Impact Energy Requirement	Contains "P" Strengthening?	Weathering Characteristics	Typical Application Scenarios
S355J0W	≥355	0°C	≥27 J	No	Basic weathering steel, Cu+Cr alloy system	Bridges, buildings, general outdoor structures
S355J0WP	≥355	0°C	≥27 J	Yes	Higher corrosion resistance (especially in initial stages)	Containers, high-humidity/industrial atmospheric environments
S355J2W	≥355	-20°C	≥27 J	No	Comparable to J0W, but with better low-temperature toughness	Bridges in cold regions, northern engineering projects
S355J2WP	≥355	-20°C	≥27 J	Yes	High corrosion resistance + low-temperature toughness	Harsh environments like marine/cold composite conditions
S355K2W	≥355	-20°C	≥40 J	No	Similar to J2W, but with higher impact energy	High-safety-grade structures (e.g., seismic-resistant, heavy-load applications)

International Standard Equivalence

Grade	Standard	Yield Strength (ReH) [min, MPa]	Tensile Strength (Rm) [MPa]	Elongation (A) [min, %]	Impact Energy (KV) [min]
S355J2W	EN 10025-5	355	470 - 630	22	27J (at -20°C, Longitudinal)
Q355NHD	GB/T 4171	355	490 - 630	22	34J (at -20°C, Longitudinal)
A588 Grade A/B	ASTM A588/A588M	345	≥ 485	21	-
SMA490AW	JIS G3114	325	490 - 610	17	-

* Equivalent materials are only approximations, mechanical properties and chemical composition must be compared during application design.

FAQ

Q1:

What is the service life of weathering steel?

Inland, dry environments: 50+ years (maintenance-free); industrial/suburban environments: 30–50 years; coastal areas with low salt spray: 15–25 years (additional corrosion protection required in areas with high salt spray).

Q2:

Can weathering steel be used in coastal areas or environments with high salt spray levels?

Use with caution. In environments with high salt spray levels or high chloride ion concentrations, the rust layer on standard weathering steel is easily penetrated, accelerating corrosion and potentially leading to pitting or perforation.

Q3:

What are the welding properties of weathering steel?

It has good welding properties and can be welded using conventional processes such as manual arc welding and gas shielded arc welding.

Q4:

Does weathering steel require painting?

In normal atmospheric conditions (urban or rural), painting is not required; a stable passivation layer will form after 6–18 months of exposure, providing a corrosion resistance lifespan of 80–100 years.

High-humidity / highly corrosive environments (coastal areas, industrial acid rain, salt spray zones): It is recommended to apply a thin coat of weathering primer initially or to carry out regular maintenance to prevent the early loss of the rust layer.

Concealed / damp, poorly ventilated areas: Waterproofing and anti-corrosion coating must be applied to prevent localised rusting from worsening.

Q5:

How long does it take for a rust layer (oxidation layer) to form on weathering steel?

The rate at which the oxidation layer forms depends on climatic conditions. In outdoor environments with significant fluctuations between dry and wet conditions, it typically takes between six months and two years for a stable, dark brown protective layer to form. During the initial stage, rust streaks may form, so care should be taken to protect the surrounding building surfaces.