Low alloy W and S beams are made out of which materials?

Low alloy W and S beams are primarily constructed from ASTM A572 and ASTM A992 materials. ASTM A572 specifies high-strength low-alloy steel that offers improved strength-to-weight ratios and excellent weldability, making it ideal for structural applications like beams. This specification includes various grades that provide different yield strengths, allowing for flexibility in design based on load requirements.

ASTM A992 is specifically tailored for structural steel shapes, particularly for wide-flange (W) and S beams. It is widely used because of its favorable properties, including higher yield strength, better toughness, and fatigue resistance. The combination of A572 and A992 ensures that the structural components meet rigorous performance requirements in construction applications.

Thus, these materials are preferred choices for creating low alloy W and S beams used in construction, which is why the answer is based on their properties and applications outlined in the Structural Welding Code.