Steel is an alloy made up of iron with typically a few tenths of a percent of carbon to improve its strength and fracture resistance compared to iron. Many other elements may be present or added. Stainless steels that are corrosion- and oxidation-resistant need typically an additional 11% chromium.
Alloy steel is a steel that has had small amounts of one or more alloying elements (other than carbon). These include elements such as manganese, silicon, nickel, titanium, copper, chromium and aluminum. Alloying the steel produces specific properties to the metal. Alloy steels are generally more responsive to heat and mechanical treatments than carbon steels.
Stainless steel is a steel alloy with increased corrosion resistance compared to carbon or alloy steels. Common alloying ingredients include chromium, nickel, or molybdenum. There are different grades of stainless steel which have different properties for different uses. Common applications include food handling or processing, medical instruments, hardware, appliances, and structural uses.
Tool steel is a high hardness steel that is resistant to abrasion. Specific tool applications are dies, cutting blades, mold making, or impact applications like hammers. It is also a common material used to make knives.
Tool Steels are extremely hard and are quite often used to form other metal products.
This is the most common use for galvanized metal, and hundreds of thousands of tons of steel products are galvanized annually worldwide. In developed countries most larger cities have several galvanizing factories, and many items of steel manufacture are galvanized for protection. Typically these include: street furniture, building frameworks, balconies, verandahs, staircases, ladders, walkways, and more. Hot dip galvanized steel is also used for making steel frames as a basic construction material for steel frame buildings.