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Steel is an alloy made primarily of iron and a small amount of carbon, usually up to about 2% by weight, which makes it much stronger and harder than pure iron. It is one of the most widely used materials in construction, industry, and everyday products because of its strength, durability, and recyclability.

Steel consists mainly of iron with added carbon and often small amounts of other elements such as manganese, chromium, nickel, or silicon. These alloying elements change their properties—for example, adding chromium creates stainless steel, which resists rust and corrosion.

Steel is strong under tension and compression, keeps its shape, and can last over 100 years in many applications. It is relatively heavy and can rust if not protected (by coatings such as zinc/galvanizing or by using stainless‑steel grades).

Most steel starts from iron ore that is reduced to iron in a blast furnace, then converted into steel in a basic oxygen furnace (BF‑BOF route). A growing share is also made in electric arc furnaces using mainly recycled steel scrap and electricity, which is more energy‑efficient.

Common uses :

Steel is used in buildings, bridges, railways, cars, ships, machinery, tools, and appliances such as refrigerators and washing machines. It is also used in everyday items like cutlery, fasteners, and structural supports in homes and factories.

The main types of steel are usually grouped into four broad categories, based on their chemical composition and use.

1. Carbon steel

Carbon steel is iron with mainly carbon (typically up to about 2%) and only small or negligible amounts of other alloying elements. It is further divided into:

Low‑carbon (mild) steel

Medium‑carbon steel

High‑carbon steel

It is widely used in construction, pipes, car bodies, and general‑purpose parts because it is strong, cheap, and easy to weld and machine.

2. Alloy steel

Alloy steels contain added elements such as manganese, chromium, nickel, molybdenum, or vanadium to improve strength, hardness, toughness, or wear and heat resistance. These steels are common in gears, shafts, axles, and other high‑stress mechanical parts where ordinary carbon steel would fail.

3. Stainless steel

Stainless steels are defined by their high chromium content (usually at least 10.5%) and often nickel, which gives them excellent corrosion and rust resistance plus a shiny, attractive surface. They are widely used in kitchenware, cutlery, medical instruments, tanks, and building cladding.

4. Tool steel

Tool steels are designed to stay hard and wear‑resistant at high temperatures, often containing tungsten, molybdenum, vanadium, and cobalt. They are used for cutting tools, dies, molds, drills, and other tooling where hardness and heat resistance are critical.