Ford has replaced steel with aluminum in the body of the top-selling F-150, and now General Motors is looking to follow suit by putting more of the lighter and costlier metal in its own pickups.
ArcelorMittal is appealing a recent court ruling that three rival steelmakers did not violate its patent for a special type of aluminum-coated high-strength steel that is made in Northwest Indiana for the auto industry.
Steelmakers are designing new lightweight car parts so that car makers won't come up with designs that involve aluminum.
Stringent fuel-efficiency standards have pitted steel against rival metals in a race to make cars, trucks and SUVs lighter.
After years of research and hundreds of designs, ArcelorMittal has developed a new ultra lightweight car door that's expected to improve fuel efficiency.
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