PBS
Pbs Learning Media: Elements of Steel
This resource from the AMERICAN EXPERIENCE Web site, which contains both an interactive activity and illustrated text, looks at the composition of different types of steel and their impact on technology.
Nobel Media AB
The Nobel Prize: Iron, Steel, and Invar
Read about the history of iron use and the many applications of steel in modern life. Learn about how iron is extracted from ore, how steel is made, and the invention of invar, an iron-nickel alloy, by physicist Charles Edouard Guillaume.