Chemical Composition and Mechanical Properties of A588 Grade C Weathering Steel

A588 Grade C Weathering Steel is a high-strength, low-alloy steel that has increased resistance to atmospheric corrosion compared to other carbon steels such as ASTM A572 Grade 50. This increased weatherability is due to the addition of copper, chromium and nickel, which provide better corrosion protection against atmospheric conditions.

Chemical Composition of A588 Grade C Weathering Steel

A588 Grade C weathering steel is composed of the following chemical elements:

• Carbon - 0.127-0.130%
• Manganese - 0.7-1.2%
• Silicon - 0.20-0.80%
• Chromium - 0.40–0.65%
• Nickel - 0.40-0.65%
• Copper - 0.20-0.40%
• Phosphorus – 0.035%
• Sulfur - 0.040%
• Vanadium - Approximately 0.02%

Mechanical Properties of A588 Grade C Weathering Steel

The physical properties of A588 Grade C weathering steel are:

• Tensile Strength - 70 ksi (min)
• Yield Strength - 50 ksi (min)
• Elongation - 28% (min)
• Hardness, Brinell - 120 (max)
• Hardness, Rockwell B - 80 (max)
• Modulus of Elasticity – 29000 ksi

A588 Grade C weathering steel has excellent weldability, formability and toughness, making it ideal for structural applications requiring high strength and corrosion resistance. A588 Grade C weathering steel is commonly used in bridges, buildings, steel towers, frames and other construction applications.