Understanding Weathering Steel Plate - What is Weathering Steel Plate?

In the world of construction and architecture, weathering steel”often referred to as "COR-TEN steel"”is a steel material often used in outdoor applications. This article will explore the characteristics, applications, forms and grades of this unique material.

What is Weathering Steel Plate?

Weathering steel is a high-strength, low-alloy steel that develops a protective layer of rust when exposed to the elements. This outer layer, which is known as a patina, acts as an abrasion resistant barrier against corrosion and depends heavily on environmental factors like humidity and exposure to air. This characteristic makes weathering steel ideal for outdoor applications, where it can withstand harsh environmental conditions without the need for painting or maintenance. It is worth noting that it could take up to six years for the patina to reach its final form.

Weathering steel was first developed by U.S. Steel under the trademark COR-TEN. Although weathering steel has since been standardized, it remains synonymous with COR-TEN. Today, most weathering steel plate sold in North America is unbranded and adheres to ASTM A606, ASTM A588 and ASTM A871.

Applications of Weathering Steel

Weathering steel's unique properties make it highly suitable for various applications, especially in construction. It is most seen in façade applications and used on structures exposed to elements, such as bridges and buildings. It is often chosen for projects that require durability and minimal upkeep. Its unique visual aesthetic character of a structure also makes it a popular choice among architects and designers.

Forms of Weathering Steel

Weathering steel is available in various forms, each with its unique benefits. Some common types include:

• Plate (> 0.75" in thickness)
• Sheet
• Strip
• Tube

Leeco only supplies weathering steel in plate and sheet form.

Grades of Weathering Steel

Leeco Steel, the largest supplier of steel plate in North America, offers grades of weathering steel, including:

• A588: This structural plate is commonly used in construction for its strength, durability and corrosion-resistance.
• A606: Available in sheet form, this grade is ideal for applications requiring a lightweight yet sturdy material.
• A871: This plate is ideal for tubular structures and poles due to its corrosion resistant properties.

Why Choose Weathering Steel?

The benefits of weathering steel make it an attractive choice for builders and architects alike:

• Low Maintenance: With its natural rust coating, weathering steel requires minimal upkeep compared to traditional steel.
• Aesthetic Appeal: The unique, rustic appearance of weathering steel adds character to any project, making it a favored choice for architectural applications.
• Environmental Resistance: Its ability to withstand harsh weather conditions without deterioration ensures longevity and reliability.

As the demand for durable, low-maintenance materials continues to rise in the construction industry, weathering steel”commonly known as COR-TEN”stands out as a leading choice. With its blend of strength, aesthetic appeal and environmental resilience, it offers a versatile solution for various applications.

For more information on sourcing weathering steel or to explore specific applications, contact our team today.