[t vago]

This seems fascinating -

Steel nanotechnology can reduce the weight of our cars — Autoblog

The world's largest steel maker, ArcelorMital, says it has come up with a new kind of steel that the world has never seen before. Thanks to nanotechnology, the company says automakers can now match the weight of aluminum cars, but do it in steel at far lower cost.

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The nano steel itself is not inherently lighter, but it's so strong that automakers can use thinner gauges and that's where part of the weight savings comes from. Another part of the weight savings comes from not having to use additional brackets, gussets or panels to strengthen the structure.