​Stainless steel will be used for the SpaceX Starship and Super Heavy rocket booster. Over the spectrum of operating temperatures and ​conditions encountered, stainless steel has better performance than carbon fiber. ​From a recent interview with @PopMech, it's apparent that @ElonMusk has more than just a passing awareness of materials and manufacturing. In it, Musk describes how material selection affects stiffness, fracture toughness, and of course cost. He talks about [...]