In the United States, steel is generally more expensive than aluminum. This is primarily due to the higher demand for steel, which is a fundamental material in construction, automotive, and manufacturing industries. According to the American Iron and Steel Institute (AISI), the average price of steel in 2021 was around $1,000 per ton, whereas the average price of aluminum was approximately $2,200 per ton. This discrepancy is influenced by several factors.

Firstly, steel production is more energy-intensive and requires a larger upfront investment in infrastructure and technology compared to aluminum. The process of steelmaking involves heating iron ore to extract iron, which is then combined with carbon to form steel. In contrast, aluminum production involves extracting bauxite ore, which is then processed to produce aluminum. The smelting process for aluminum is more energy-efficient but requires specialized facilities and technology.

Secondly, the global supply and demand dynamics play a significant role in pricing. Steel is a widely used material, and its demand is often influenced by economic conditions and construction activity. During periods of economic growth, steel demand increases, leading to higher prices. Aluminum, while also in high demand, is often seen as a more versatile material with applications in transportation, packaging, and consumer goods. However, the supply of aluminum can be more volatile due to factors such as mining disruptions and geopolitical tensions.

Additionally, the cost of raw materials and transportation can impact the prices of both steel and aluminum. Iron ore and coal are key inputs for steel production, while bauxite is the primary source for aluminum. The availability and cost of these raw materials can fluctuate significantly, affecting the overall cost of production. Moreover, transportation costs can vary depending on the distance between the production facilities and the end-users.

In conclusion, steel is generally more expensive than aluminum in the United States due to higher demand, energy-intensive production processes, and global supply and demand dynamics. While aluminum has its own advantages and applications, the current market conditions favor steel in terms of pricing.