The largest rocket shell is made of stainless steel

SpaceX is currently using stainless steel to make rockets. This is the first time that stainless steel has been used in the manufacture of spacecraft. The carbon fiber material of the Big Falcon Rocket shell will be replaced by 300 series stainless steel.

Most steels become very brittle under low temperature conditions. But not for stainless steel with high chromium and nickel content. Chromium nickel will increase the strength of stainless steel and improve ductility. At minus 330 degrees Fahrenheit, this stainless steel will have a ductility of 12% to 18%. It is 301 stainless steel. 301 is the steel that is most easily strengthened by cold deformation. Cold deformation can increase the strength and hardness of the steel, and retain sufficient plasticity and toughness. With the help of stainless steel, which has guaranteed strength and heat resistance, the shell of this rocket, which is known as "direct to Mars", is made of stainless steel!