Corten steel, also known as weathering steel, has become a top choice for architects, landscapers, and designers due to its striking rustic appearance and exceptional durability. But what exactly is Corten steel, and why is it so popular? This blog introduces you to how to buy Corten steel, speed up its rusting process, or learn how to weld and maintain it。
What is Corten Steel? Composition, Uses & Benefits
Corten steel, also known as weathering steel, is a high-strength, low-alloy steel designed to develop a stable rust-like appearance when exposed to the elements. Instead of corroding like traditional steel, it forms a protective oxide layer that prevents further deterioration. This natural weathered look makes it a favorite in architecture, landscaping, and artistic sculptures.
What is Corten Steel Made Of?
Corten steel is primarily composed of iron, with carefully balanced additions of copper, chromium, nickel, and phosphorus. These alloying elements enhance its corrosion resistance by promoting the formation of a self-protecting rust layer. This patina not only shields the steel from further damage but also eliminates the need for painting or regular maintenance, making it a durable and cost-effective material.
Here is a well-structured table with Corten Steel Composition:
| Element | Content Range (%) | Function |
|---|---|---|
| Iron (Fe) | Base Material (Major Component) | Provides fundamental strength and toughness |
| Carbon (C) | 0.12 – 0.16 | Increases hardness and strength but reduces toughness if excessive |
| Silicon (Si) | 0.25 – 0.75 | Enhances rust layer formation and improves corrosion resistance |
| Manganese (Mn) | 0.20 – 0.50 | Improves strength, wear resistance, and machinability |
| Phosphorus (P) | 0.07 – 0.15 | Aids in patina formation and enhances weather resistance |
| Sulfur (S) | ≤ 0.03 | Kept at low levels to prevent brittleness |
| Chromium (Cr) | 0.40 – 0.65 | Enhances corrosion resistance and stabilizes the rust layer |
| Nickel (Ni) | 0.40 | Improves durability and ductility |
| Copper (Cu) | 0.25 – 0.55 | Promotes the development of a protective patina and boosts atmospheric corrosion resistance |
These elements work together to give wetterfester Stahl its unique self-protecting rust layer, making it highly resistant to weathering without the need for additional coatings.
Unlike standard carbon steel, which deteriorates over time due to rust penetration, Corten steel develops a self-healing rust layer. This unique property, known as patina formation, acts as a barrier, significantly slowing down the corrosion process.
Common Applications of Corten Steel
Thanks to its strength, durability, and distinctive appearance, Corten steel is widely used in various industries:
Architecture & Construction
Used in pergola facades, bridges, and roofing for a modern yet weathered look.
Landscape & Garden Design
Popular for planters, edging, and water features, blending naturally with outdoor environments.
Art & Sculptures
Valued by artists for its evolving texture and deep, earthy tones
Corten Steel’s blend of durability, low maintenance, and natural beauty makes it an ideal material for both functional and artistic applications.
Where to Buy Corten Steel: China Suppliers & Global Options
Online Platforms – Corten Steel is widely available on B2B marketplaces such as Alibaba, Made-in-China, and ThomasNet, where you can compare prices and suppliers globally.
China Manufacturer Websites – Buying directly from China-specialized Corten steel manufacturers ensures product authenticity, better pricing, and customization options， such as HNJBL, and KEWEI.
Local Metal Suppliers – Many steel distributors and fabrication shops stock Corten steel sheets, plates, and custom-cut products for immediate pickup or delivery.
How to Choose a Reliable Corten Steel Supplier
Not all weathering steel is the same. When selecting a supplier, consider:
Quality Standards – Look for ASTM A588 or A606 certification to ensure high-grade weathering steel. Customization Services – Need specific sizes, thicknesses, or finishes? A manufacturer offering tailored solutions ensures your project’s success. Reputation & Reviews – Check customer feedback, response time, and project experience to avoid unreliable vendors.
Our Advantage: We specialize in high-quality, precision-cut Corten steel products, providing custom fabrication and worldwide shipping.
Corten Steel Pricing: What Affects the Cost?
Corten steel prices vary based on thickness, sheet size, and order volume. Here’s a general price range:
| Dicke | Standard Size | Price Range (USD per Ton) |
|---|---|---|
| 1.5mm – 3mm | 1220mm x 2440mm | $800 – $1,200 |
| 4mm – 6mm | 1500mm x 3000mm | $1,000 – $1,500 |
| 8mm – 12mm | Custom Sizes | $1,200 – $1,800 |
Prices fluctuate based on market demand, raw material costs, and processing fees. Bulk orders often qualify for discounted rates.
Working with Corten Steel: Welding, Painting & Fabrication Tips
Can You Weld Corten Steel?
Yes, You can weld weathering steel by yourself, the right technique and materials are crucial for maintaining its weathering properties.
How to Weld Corten Steel
- 1. Select the Right Welding Rod – Use low-alloy electrodes like E8018-W, E7018, or ER80S-G for MIG/TIG welding.
- 2. Control Heat Input – Keep preheat at 150-200°C (302-392°F) and limit interpass temperatures to 450°C (842°F) to prevent excessive brittleness.
- 3. Avoid Over-Welding – Excessive heat can disrupt the patina formation.
🔹 Welding Corten Steel to Mild Steel
- Use E7018 or ER70S-6 electrodes for better compatibility.
- Expect slight color variations in the patina due to different oxidation rates.
Can Corten Steel Be Painted or Sealed?
While Corten steel is designed to rust naturally, painting or sealing can be an option for specific applications.
✅ Painting Corten Steel
- Requires sandblasting oder etching primer to ensure adhesion.
- Protects against staining on adjacent surfaces in humid environments.
- May compromise the self-healing patina effect.
✅ Sealing Corten Steel
- Matte clear coats help preserve the rusted look while preventing staining.
- Oil-based or acrylic sealers reduce runoff in urban or indoor settings.
- Recommended Products: Rust-Oleum Clear Sealer, Penetrol Oil.
How to Bend Corten Steel Without Cracking
Bending Cortenstahl requires careful handling to prevent cracks, especially in thicker plates.
🔹 Cold Bending (For thinner sheets, ≤6mm)
- Use a press brake with a larger bend radius to avoid stress fractures.
- Gradually increase pressure rather than forcing a sharp bend.
🔹 Hot Bending (For thicker plates, >6mm)
- Heat the steel to 600-800°C (1112-1472°F) before bending.
- Use slow, controlled cooling to maintain strength.
💡 Tip: If working with pre-weathered Corten, be aware that bending may expose fresh steel, requiring additional weathering treatment.
By using the right welding, sealing, and bending techniques, you can maximize Corten steel’s durability and aesthetic appeal across various applications.
FAQ
1. Does Corten steel drip rust?
Yes, during the initial weathering phase, Corten steel will bleed rust, which can stain nearby surfaces. Over time, the patina stabilizes, reducing runoff. To prevent staining, consider using a clear sealer or placing the steel in areas where runoff won’t be an issue.
2. Can Corten steel be used indoors?
It’s not recommended unless properly sealed. Without exposure to moisture and air, the patina won’t form naturally, and rust particles may transfer onto floors or furniture. If using indoors, apply a rust stabilizer oder clear coat to maintain its look.
3. Does Corten steel stain concrete or wood?
Yes, Corten steel can stain porous materials like concrete, wood, and stone due to rust runoff. If placing near delicate surfaces, use drainage control or apply a sealant to minimize staining.
4. Can you bend Corten steel?
Yes, but bending Corten steel requires proper technique. Thin sheets (≤6mm) can be cold-bent, while thicker plates should be hot-bent to avoid cracking.
5. How long does Corten steel last?
When properly installed, Corten steel can last for decades, even in harsh weather conditions. The protective rust layer continuously regenerates, ensuring long-term corrosion resistance.
6. Can Corten steel be painted?
Yes, but painting defeats its self-protecting properties. If needed, use etching primer und high-quality outdoor paint to ensure adhesion.
7. How fast does Corten steel rust?
Die patina formation takes about 6-12 months in normal weather conditions. Speeding up the process can be done with saltwater sprays oder accelerators.
For more details or custom weathering steel solutions, Get a Quote today! 🚀
