ASTM A572 is a standard specification for high-strength, low-alloy structural steel used in construction and engineering. It provides guidelines for various grades of steel, which are categorized based on their yield strength, ranging from 42 to 65 ksi (kilopounds per square inch). This material is commonly used in bridges, buildings, and other structures due to its excellent strength-to-weight ratio. The specification ensures that the steel meets specific mechanical properties and chemical compositions, making it suitable for various applications. ASTM A572 is particularly valued for its weldability and resistance to atmospheric corrosion, enhancing the durability of structures built with it.