COR-TEN¬ģ steel became popular among architects. There are three reasons for¬†that:
- Corten needs zero maintenance.
- Corten changes colors and¬†becomes more beautiful year after year.
- Corten is a¬†sustainable material
COR-TEN¬ģ was invented for¬†building coal carriages in¬†1930s America. Corten steel plate might look like it‚Äôs rusty. Still, thanks to¬†clever manipulation in¬†its processing, the¬†outer oxidization protects the¬†steel from further corrosion, as¬†well as¬†making it look excellent indeed. There‚Äôs no¬†need to¬†paint Corten, and¬†it changes the¬†color itself over time. Last century Corten was the¬†metal of¬†choice for¬†containers and¬†other shipping elements. More recently, though, it‚Äôs become the¬†material of¬†choice for¬†many artists, architects, and¬†interior designers. Corten steel cladding is popular and¬†often used for¬†buildings, giving it a¬†tough coating against the¬†elements and¬†an¬†industrial-looking edge.
How is it made
Weathering steel is an¬†alloy, which is what makes it so resistant to¬†the¬†elements. The¬†addition of¬†nickel, copper, and¬†chromium at¬†the¬†production stage means that a¬†protective patina will develop on¬†the¬†surface of¬†the¬†metal over time.
Patina Formation Process
Under the¬†influence of¬†the¬†wet and¬†dry cycles, the¬†rusting process of¬†this steel initially proceeds in¬†the¬†same way as¬†with ordinary metal. However, over time, the¬†rust develops into a¬†layer of¬†patina, and¬†its color changes from orange-brown to¬†light or¬†dark brown.
The¬†rate of¬†change and¬†the¬†final color depends on¬†the¬†ambient atmospheric conditions and¬†contaminants in¬†the¬†air¬†‚Äď sulfur will accelerate the¬†oxidation process and¬†give the¬†patina a¬†darker color. Frequent changes in¬†dry and¬†wet conditions will also accelerate oxidation.
There are 5 types of¬†corten: cold-rolled COR-TEN¬ģ A, hot-rolled COR-TEN¬ģ A, COR-TEN¬ģ B, C, and¬†D. You can find more on¬†ssab website
With which materials to¬†use
Wood, glass, concrete, and¬†bricks are the¬†perfect combinations for¬†corten steel. As¬†always in¬†architecture, you are allowed to¬†use up to¬†3 different materials for¬†the¬†fa√ßade. The¬†most popular combination is: concrete, glass, and¬†corten steel.
Corten steel Sheet is also excellent for¬†a¬†variety of¬†punching styles. Round, square or¬†rectangular holes, texts, logos, images¬†‚Äď the¬†possibilities are practically unlimited. The¬†backlighting of¬†the¬†panels will highlight the¬†selected design.
I have found two types of¬†corten steel¬†‚Äď the¬†normal one and¬†the¬†weathered corten steel. I guess the¬†weathered steel has higher protection from rain etc.
The¬†corten weathered steel sheet costs from 41¬£¬†(55$) per¬†m2 with 1.5mm width to¬†200¬£¬†(250$) with a¬†width of¬†6 mm.
The¬†corten weathered steel sheet costs from 120¬£¬†(150$) per¬†m2 with 1.5mm width to¬†350¬£¬†(450$) with a¬†width of¬†6 mm.
However, this is a¬†retail price; the¬†wholesale price will be lower. The¬†company that I used to¬†get the¬†price is located in¬†the¬†UK; their prices for¬†labor are high. Therefore, in¬†Russia, this technology costs less.
note: the¬†dollar prices are not¬†precise, and¬†the¬†price excludes VAT