No, steel is a metal.
Using plastic over steel wings on a windmill is a good idea because the steel will eventually rust. The steel is heavier and the motor on the windmill will have to work harder to turn steel, than plastic. The cost of the plastic is actually a little more than steel, though.
lawn mower blades are made of steel but some are made of plastic
California makes steel pipe and tubes
sheet metal, steel coil, slit steel coil, steel round bars, steel flat bars, steel channels, plastic resins, plastic sheet, wood, fiberglass, graphite
Steel for the bladeWood or strong plastic shaftHandle from steel and wood, or sometimes hard plastic.
steel
steel
California, with 19, was home to the greatest number of steel investment foundries
If by plastic you mean a material made from plastic as opposed to plastic deformation of say steel for example, then yes, they are synthetic.
Steel mills are located in the following areas Algoma Steel Sault ste. Marie Ontario Canada Olympic Steel Cleavland Ohio, U.S.A. Dofasco Steel Hamilton Ontario, Canada California Steel Industries Fontana, California USA United States Steel Pittsburg California USA
Not all horseshoes are made from steel. Though usually made of steel, aluminium is also sometimes used. Aluminium shoes are dearer than steel. There are also plastic-coated metal shoes, and even all-plastic horseshoes.