What are the two most commonly used materials for structural framing metals?

The two most commonly used materials for structural framing metals are steel and aluminum. Steel is favored for its high strength, durability, and versatility, making it an ideal choice for a wide range of construction applications, including commercial buildings, bridges, and infrastructure. Its ability to withstand heavy loads and its relative cost-effectiveness contribute to its widespread use in structural framing.

Aluminum, on the other hand, is appreciated for its lightweight properties, corrosion resistance, and ease of fabrication. Although it does not have the same strength-to-weight ratio as steel, aluminum is often used in applications where weight reduction is crucial, such as in high-rise buildings and structures where materials need to be light yet strong. The combination of steel and aluminum allows engineers and builders to design structures that meet specific performance requirements while optimizing material use.

Other materials mentioned in the alternatives, such as brass and plastic, do not typically fulfill the requirements for structural framing in construction, as they lack the necessary strength and durability to serve as primary support elements in large-scale or load-bearing constructions. Wood, while used in some framing applications, is not a metal and thus does not fit into the category of structural framing metals.