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What is Corten steel?

Corten steel, which is also known as ‘weathering steel’, is a group of steel alloys that were originally developed to eliminate the need for painting or applying protective coatings to steel surfaces. So, what truly sets Corten Steel apart from its peers? When subjected to atmospheric elements, this remarkable material develops a protective layer resembling rust on its surface. This unique characteristic makes it highly resistant to corrosion.

This innovative material was first brought to life back in the 1930s. Its primary application was within the railroad industry, and it was subsequently patented by the well-known U.S. Steel (USS). Interestingly, the name “COR-TEN” stands for the material’s two primary properties. ‘Cor’ signifies Corrosion Resistance, while ‘Ten’ indicates Tensile Strength.

What is Corten steel made of?

Primarily composed of iron and a small amount of carbon, Corten steel sets itself apart due to the inclusion of unique alloying elements: chromium, nickel, copper and added phosphorous which gives the steel its self-protecting properties. A particularly noteworthy feature of this composition is the ability of the materials outer layer to naturally repair itself when subjected to scratches or damage, demonstrating its resilience and longevity.

Is Corten Steel Weldable?

If you’re wondering about the welding prospects of Corten steel, it is relatively similar to other low-carbon steels, such as mild steel. However, a special filler material may be required depending on the particular application. This means that, provided with the right machinery and tools, Corten steel can easily be welded and shaped to cater to your unique requirements.

Is Corten Steel Expensive?

Although corten might come with a higher upfront cost when you compare corten steel vs mild steel, it turns out to be an economical choice in the long run. Given its resilience and low maintenance requirements, your investment in Corten steel recoups itself as time goes by.

Furthermore, when you consider the expenses associated with protecting other sheet metals via processes like painting or galvanizing, the price difference starts to level out, reaffirming the cost-effectiveness of Corten steel.

How does Corten Steel Weather?

One of the fascinating aspects of Corten steel is its weathering process, which typically takes around 6-9 months, depending on the prevailing weather conditions. At the start of the process, the steel develops an orange patina. As time goes on, this turns into a darker brown hue, providing Corten steel its iconic look. It’s important to note that Corten steel requires a cycle of alternating wet and dry conditions to form this protective layer effectively.

Where is Corten steel used?

Corten steel’s unique properties have led to its use across a range of industries, including architecture, construction, and landscape. You’ve probably seen it in the form of large structures like bridges, or even the Angel of the North, a renowned sculpture. But Corten steel isn’t limited to grand structures alone. It’s also become very popular in recent years for creating outdoor garden products such as corten steel planters, artwork, edging, water features, and street furniture, adding a natural and rustic aesthetic to any outdoor space.

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