Corten B corten steel plate is a high-strength, low-alloy weathering steel widely used in bridges, containers, railway vehicles, and outdoor structures due to its excellent corrosion resistance.
Corten B corten steel plate
It forms a protective patina that prevents further corrosion, reducing maintenance and extending service life. For engineers and procurement managers working internationally, it is essential to understand the equivalent grades of Corten B in other standards, particularly in Europe, the U.S., and China.
Overview of Corten B
Developed as a weathering steel with good atmospheric corrosion resistance
Low-alloy composition includes Cu, Cr, Ni, P, Mo, Nb, V, Ti
Minimum yield strength: ≈355–450 MPa depending on thickness
Forms a stable α-FeOOH rust layer when exposed to air
Advantages over ordinary carbon steel: low maintenance, long service life, cost-effectiveness
International Equivalents of Corten B corten steel plate
Corten B is not a standard steel in all countries. Several international standards have equivalents in terms of strength, toughness, and corrosion resistance:
| Region / Standard | Equivalent Grade | Minimum Yield Strength | Comments |
|---|---|---|---|
| Europe (EN 10025-5) | S355J2W / S355W | 355 MPa | Weathering steel; comparable corrosion resistance |
| China (GB/T 4171) | Q355GNH / Q450NQR1 | 355–450 MPa | High-strength, corrosion-resistant weathering steel |
| U.S. (ASTM) | ASTM A242 Type 1 | 345 MPa | Commonly used in bridges, containers; natural weathering steel |
| U.S. (ASTM) | ASTM A588 | 345–450 MPa | High-strength, low-alloy, corrosion-resistant; widely used outdoors |
| Germany (DIN) | 1.8945 / Corten B | 355 MPa | German designation for weathering steel |
Depending on mechanical property and corrosion performance requirements, S355J2W and ASTM A242 / A588 are considered functional equivalents to Corten B.
Chemical Composition for Corten B corten steel plate
| Element (wt%) | Corten B | S355J2W | ASTM A242 | Q355GNH |
|---|---|---|---|---|
| Carbon (C) | 0.12–0.20 | ≤0.22 | 0.12 max | 0.12–0.18 |
| Silicon (Si) | 0.20–0.50 | 0.25–0.75 | 0.20–0.50 | 0.20–0.50 |
| Manganese (Mn) | 0.80–1.50 | 1.00–1.70 | 0.50–1.25 | 1.20–1.70 |
| Phosphorus (P) | ≤0.035 | ≤0.035 | ≤0.035 | ≤0.030 |
| Sulfur (S) | ≤0.030 | ≤0.035 | ≤0.040 | ≤0.030 |
| Copper (Cu) | 0.20–0.50 | 0.20–0.50 | 0.25–0.50 | 0.25–0.55 |
| Chromium (Cr) | 0.30–0.50 | 0.50 max | 0.50 max | 0.30–0.60 |
| Nickel (Ni) | 0.20–0.40 | – | – | 0.20–0.40 |
Corten B contains Cu, Cr, and Ni for corrosion resistance. The European and ASTM equivalents focus on Cu content, but may lack Ni or microalloying elements.
Mechanical Properties for Corten B corten steel plate
| Property | Corten B | S355J2W | ASTM A242 | Q355GNH |
|---|---|---|---|---|
| Yield Strength | ≥355 MPa | ≥355 MPa | 345 MPa | 355–450 MPa |
| Tensile Strength | 470–630 MPa | 470–630 MPa | 470–620 MPa | 470–630 MPa |
| Elongation (A%) | ≥18% | ≥20% | 20–25% | ≥18% |
| Impact Toughness | Excellent | Good | Moderate | Excellent |
| Hardness (HB) | 150–200 | 140–180 | 140–180 | 160–210 |
Corten B and its equivalents have similar strength, but Corten B and Q355GNH provide enhanced corrosion performance due to microalloying and Ni content.
Applications of Corten B corten steel plate
Corten B is ideal for outdoor and harsh-environment structures:
- Bridges and Infrastructure: Deck plates, girders, pylons
- Railway and Transport: Freight cars, containers, chassis frames
- Construction Machinery: Frames, booms, heavy equipment
- Architectural Projects: Sculptures, building facades, urban installations
Select Corten B or its equivalents based on environmental exposure, load-bearing requirements, and maintenance expectations.
Corten B steel plate is a weathering steel with high strength and atmospheric corrosion resistance. Contact us today to request a quote or learn more about our full range of weathering steel solutions.
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What is the equivalent of Corten B steel?
Corten A has added phosphorous, which makes it suitable for aesthetic facias and gas flue applications, while Corten B is better suited for heavy and load-bearing structures. S355JOW is an equivalent weathering steel to Corten B.
What is Corten used for?
CORTEN steel has atmospheric corrosion resistance and this enables it to be used without paint for many structural / architectural applications, which include structures like bridges, some open-frame buildings, transmission poles and sculptures.
What is the difference between Corten A and Corten B?
CorTen A is often used for aesthetic purposes It is not recommended for use where the structure is subject to vibration. CorTen B is more suitable for load-bearing structures than it is more resistant to vibration or earthquake, and is often chosen due to its aesthetics and more uniform stains.
What is Corten B?
Corten B is a weather resistant steel which is better suited for heavy and load bearing structures. The material forms its own protective layer when exposed to atmospheric elements. Essentially, the top layer corrodes which then protects the steel beneath it.
