Some are but screws are made of all different kinds of metal.
They are long srews that go through a fitting. They offer support. Some are made for CNC machines. You can read some more at http://www.techno-isel.com/Tic/LPBallScrew.htm A ball screw in usually made out of hardened steel. It used to make a very fine adjustment on the object that it supports.
No. Steel is made from iron alloyed with some other solid, usually carbon.
lawn mower blades are made of steel but some are made of plastic
Every industrialized nation makes at least some steel.
They come in different grades of steel. Some are made of stainless steel.
Some of it was made of steel, some parts were iron, which was less expensive than steel, and certain parts were bronze which was more expensive than steel, but superior in several respects, such as that it does not rust. The armor also have had important parts made of leather, to which the steel was attached.
If you mean what type of steel are guns made from, it depends. Some cheap guns aren't even made from steel, but instead some sort of cheap pot metal.
paper clips are usually made out of steel wire. Some are made out of plastic.
Some are made from ceramics, some from stainless steel, some from plastic.
no some are made of steel.(some 7up cans)
copper with a steel cover of zinc inside of it!
Most are made of iron or steel, but some are made of aluminum for light-weight racing shoes and there are some plastic or rubber shoes, but these aren't very durable or common.