Stainless steel is both strong and beautiful. There's a reason it has long been used to make fine watch cases. For Apple Watch, we start with an alloy of stainless steel known for its strength and corrosion-resistance. We then customize it through a series of alloying and processing steps to make it even stronger. While in its molten state the composition of the metal is tightly controlled to minimize impurities and ensure hardness. This is followed by a specialized cold-forging process, that helps to make the metal up to 80% harder and less susceptible to nicks and scratches. The forgings are then machined in a 12-station multi-axis milling machine, achieving highly accurate uniformity across the case. It's polished to a pristine, mirror finish.
