Generally, cast iron contains 2% carbon or more and silicon in what range?

In the context of cast iron, silicon is an important alloying element that influences its properties, particularly casting characteristics and strength. Cast iron typically contains a significant amount of carbon, usually over 2%, but the silicon content is crucial for its overall performance.

The correct silicon range for cast iron is approximately 1% to 3%. This amount of silicon helps improve fluidity during the casting process, enhances corrosion resistance, and impacts the microstructure of the iron, leading to desirable mechanical properties. While silicon levels can vary depending on the specific type of cast iron and its intended use, a range of 1% to 3% is generally accepted as typical.

This makes the option indicating 1% to 3% accurate, as it reflects the common composition found in various forms of cast iron, such as gray iron or ductile iron.