Short answer: Weathering steel (trademarked as Corten) forms a stable rust-like patina that seals the surface against further corrosion, eliminating the need for painting. Common grades include ASTM A588, A242, and A606, used extensively in bridges, containers, architecture, and landscape design.
At a Glance
What Makes Weathering Steel Special
Weathering steel contains small additions of copper (0.25–0.55%), chromium (0.4–1.25%), nickel, and phosphorus. When exposed to alternating wet/dry cycles, these alloying elements promote formation of a dense, adherent rust layer (patina) that dramatically slows further corrosion rate — from ~0.5 mm/year for plain carbon steel to ~0.02–0.05 mm/year once patinated.
This self-protecting characteristic eliminates painting and repainting costs over the structure’s life, making weathering steel economically attractive for large-scale outdoor applications.
Common Weathering Steel Grades
| Kelas | Min Yield | Formulir | Primary Use |
|---|---|---|---|
| ASTM A588 Gr.A/B/K | 345 MPa (50 ksi) | Plate, bar, shapes | Bridges, structures |
| ASTM A242 Type 1/2 | 345 MPa | Plate, sheet | Lighter structures |
| ASTM A606 Type 4 | 340 MPa | Sheet, coil | Roofing, siding |
| Corten A / Corten B | 295/345 MPa | Plate, coil, tube | Containers, sculpture |
Aplikasi di Seluruh Industri
Bridges & Infrastructure: Over 200 bridges in the US alone use weathering steel. Lower lifecycle cost than painted steel despite higher initial material price. See carbon steel supply options.
Shipping Containers: Corten A is the standard material for ISO intermodal containers — the patina develops naturally during ocean transit.
Architecture: Facade cladding, sculptural elements, landscape retaining walls, outdoor furniture. The evolving orange-brown patina is prized aesthetically.
Rail & Heavy Equipment: Freight cars, hopper cars, chassis frames, mining equipment exposed to weather.
Art & Sculpture: Richard Serra and other artists favor weathering steel for its dynamic surface that changes over years.
Installation & Drainage Guidelines
Weathering steel performs best when details allow proper water runoff and avoid prolonged moisture traps:
- Design joints to shed water — avoid flat horizontal surfaces that pool.
- Keep weathering steel away from chlorides (coastal spray, de-icing salts) within 2 km of ocean or on road decks unless heavily detailed.
- Allow 1–5 years for full patina development depending on climate.
- Do not enclose in contact with dissimilar metals without isolation (galvanic corrosion risk).
- Consider initial oil coating to accelerate uniform patination in dry climates.
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Pertanyaan yang Sering Diajukan
No — the whole point is that the protective patina replaces paint. Painting defeats the purpose and adds unnecessary cost. Only paint if local codes require it or for aesthetic reasons.
The active rusting phase typically stabilizes in 1–5 years depending on rainfall cycles. In wet climates, faster. In arid climates, periodic watering may help develop the patina.
‘Corten’ is U.S. Steel’s trademark for weathering steel. It has become genericized, but technically ‘weathering steel’ is the material category and Corten is one brand. ASTM A588/A242/A606 are the equivalent specification grades.
Use caution within 2 km of saltwater. Chlorides disrupt patina formation and can cause accelerated corrosion. In coastal zones, consider painted steel or stainless alternatives.
Use low-pressure water spray. Avoid wire brushing (damages patina), harsh chemicals, or high-pressure washers. Stains from water runoff during patination period usually self-heal.
Source Weathering Steel from HXSCO
HXSCO supplies ASTM A588, A242, A606, and Corten-equivalent weathering steel in plate, sheet, coil, and structural shapes. Request a quote with your specifications.