| http://www.w3.org/ns/prov#value | - By the 1980s, with more concern about corrosion resistance, automakers used perhaps 50 types of steel.Today there are more than 200 steel alloys in the automaker toolbox -- such as dual-phase steel heat-treated for more strength and TRIP (or Transformation Induced Plasticity) steel that strengthens when bent into a shape.
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