<P> With the advent of speedier and thriftier production methods, steel has become easier to obtain and much cheaper . It has replaced wrought iron for a multitude of purposes . However, the availability of plastics in the latter part of the 20th century allowed these materials to replace steel in some applications due to their lower fabrication cost and weight . Carbon fiber is replacing steel in some cost insensitive applications such as aircraft, sports equipment and high end automobiles . </P> <Ul> <Li> As reinforcing bars and mesh in reinforced concrete </Li> <Li> Railroad tracks </Li> <Li> Structural steel in modern buildings and bridges </Li> <Li> Wires </Li> <Li> Input to reforging applications </Li> </Ul> <Li> As reinforcing bars and mesh in reinforced concrete </Li> <Li> Structural steel in modern buildings and bridges </Li>

Does stainless steel contain iron or iron alloys