Weathering steel, also known as Cor-Ten steel, is an alloy steel that forms a stable rust-like appearance after several years' exposure to weather. It contains a small amount of copper which makes the steel form a thin, tight layer of rust that seals the metal below from further corrosion. This property makes weathering steel ideal for use in outdoor construction that requires little maintenance once erected. It is often used for manufacturing bridges, pole structures, facades, and sculpture. The global weathering steel market has gained significant traction over the years due to its beneficial properties like high strength, corrosion resistance and low maintenance costs.

The weathering steel market is estimated to be valued at USD 2.76 Bn in 2024 and is expected to reach USD 3.78 Bn by 2031, growing at a compound annual growth rate (CAGR) of 4.6% from 2024 to 2031.

Key Takeaways
Key players operating in the weathering steel market are ArcelorMittal, POSCO, Nippon Steel Corporation, Tata Steel, and United States Steel Corporation.

The  Weathering Steel Market Demand for low-maintenance construction materials from various end-use industries has been a key growth driver for weathering steel. Infrastructure development activities such as railroads, highways, and bridges increasingly use weathering steel owing to its longevity.

The weathering steel market has witnessed strong growth in the Asia Pacific region on account of rising industrialization and urbanization in countries such as China, India, and Japan. The expansion of rail and road networks in developing economies is favoring weathering steel adoption.

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