SpaceX Stainless Steel Rocket Will Be Lighter, Stronger and Have 65X Lower Cost Material
Elon Musk explained to Popular Mechanics why SpaceX switched to a 300 series alloy of stainless steel. Advanced carbon-fiber structure made very slow progress and the cost per kilogram was $135. There is a lot of cutting and they would lose 35 percent of the material in processing. It has to have a lot of …