Weathering steel comes in many grades, specifications and shapes and can be used in a variety of applications - from landscape projects to bridge building. Some types of weathering steel are better suited for certain applications, and knowing the right type to use for specific applications can save time and money on additional processing.
The manufacturing processing of steel can have a significant impact on steel products even if the grades and specifications are the same. For instance, weathering steels can be hot rolled or cold rolled.
What is the difference between hot rolled and cold rolled weathering steel?
This is a common question we receive from customers. The difference lies in how the material is processed.
Hot rolled steel
In the manufacturing process, hot rolled weathering steel is roll-pressed with additional heat at temperatures above 1,700 degrees Fahrenheit. This step makes the steel easier to form and shape and results in a wider size range. However, because steel shrinks slightly as it cools, hot-rolled steel can be prone to shrink, and there is less control over its final shape and dimensions. Consequently, hot-rolled steel is often used in applications where precise dimensions are not as crucial. Hot rolled steel requires much less processing, which makes it more affordable than cold rolled steel.
Cold rolled steel
Cold rolled steel starts off by being processed the same way as hot rolled steel; however, once the steel has cooled to room temperature, it is re-rolled at room temperature. This additional processing results in more precise dimensions and enhanced surface qualities. Cold rolled steels are also harder and stronger than standard hot rolled steels. Cold rolled steel, therefore, is used for more technically precise applications or applications where the appearance of the steel is more important. Due to the additional processing required, cold rolled steel is typically more expensive.
Company profile
Founded in 2008, Gnee (Tianjin) Supply Chain Group Co., Ltd. specializes in the global trade and processing of Corten steel products.
• We handle all kinds of Corten engineering projects, such as bridges, gardens, hotels, and facade systems.
• Compliant with ASTM, EN, and other international standards; third-party inspection supported.
• Exported to over 200 countries and regions worldwide.
• 8 subsidiaries across China and overseas, ensuring global service coverage.
Application Fields: Architecture, landscaping, gardening, cladding, and urban infrastructure.
