Steel, alloy of iron and carbon in which the carbon content ranges up to 2 percent. By far the most widely used material for building the world’s infrastructure and industries; it is used to fabricate everything from sewing needles to oil tankers. In addition, the tools required to build and manufacture such articles are also made of steel. The main reasons for the popularity of steel are the relatively low cost of making, forming, and processing it, the abundance of its two raw materials, and its unparalleled range of mechanical properties
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