How are Iron and Steel Different from One Another?

Metals and Mining Review | Friday, July 02, 2021

When the recipe for the steel alloy is controlled, and the material is processed accurately, an alloy consisting primarily of iron can be one of the most valuable materials. 

FREMONT, CA : The distinction between iron and steel is that iron is an element, whereas steel is an alloy of iron and carbon in its most basic form. As "wrought" signifies forged, some may conclude that "wrought iron" also refers to steel in some way.

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The terms trace back to the initial days of ironwork, even before it was produced on an industrial scale. By today's standards, the early refinement of iron from ore was a primitive process, resulting in cast material full of flaws and impurities. The thermomechanical technique of forging cast iron into "wrought iron" was a way to refine and enhance iron, making it more valuable as a structural material.

Creation of Steel

The alloy known as steel was produced when extremely minute amounts of carbon were added to molten iron. As a result, the iron's crystal structure is disrupted and distorted by dispersed carbon atoms, boosting mechanical properties.

Subsequent thermomechanical processing, like forging, ensures that the cast structure of the primary ingot is transformed, assuring consistent mechanical qualities by dispersing clumps of impurities or alloying elements and crushing voids that can compromise the final product. The heated forging process also causes the alloy to recrystallize, resulting in a "fine grain" microstructure. It increases the durability of the steel and fatigue qualities.

Steel Vs. Iron Properties

Steel is tougher than iron and more robust than other types of iron in terms of yield and ultimate tensile strength. Steel with carbon additions of less than 5 percent by weight is the most common type. While higher percent carbon additions increase strength, they also make the steel brittle.

Manganese, silicon, phosphorus, and sulphur are some of the other elements contained in the steel. In addition, nickel, chromium, molybdenum, and vanadium may be added to steels in the "alloy steel" category. Stainless steel is chromium-rich steel with low carbon content.

Every additional element, even in minor amounts, adds to the steel alloy's desirable qualities. An alloy made mainly of iron is one of the most valuable materials ever invented when the composition for the steel alloy is managed and the material is handled correctly.

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