Plastics and synthetics have replaced steel in many areas.

Aluminum has also replaced steel on gear tooth surfaces.

Bridges-CNT may be able to replace steel in suspension and other bridges.

If we can get it down to reasonable levels, it could replace steel altogether in drivers.

Ceramics, vinyl, and new materials are replacing wood, steel, and other building materials.

Plastic replaces steel, there's nothing to tip arrows with, and also not much of desire.

They stated: "Cultural resources are the raw materials of the city and its value base; its assets replacing coal, steel or gold.

Carbon Fiber is replacing steel in some cost insensitive application such as aircraft, sports equipment and high end automobiles.

The products can be used for joists and beams that replace steel in many building projects.

Ceramic balls can be used to replace steel in ball bearings.