Everyone knows that stainless steel is more expensive than aluminum alloy, but in addition to corrosion resistance, stainless steel is more reliable in texture. As mentioned above, in actual use, surgical stainless steel is very common, and the reason is also because stainless steel has toughness and toughness. In the past when iPhone6 was launched, because aluminum alloy was so soft, the back was easy to bend. The softness of aluminum alloy made it easy to stretch or even bend. But stainless steel is different. This shortcoming can be changed so that it can maintain its shape in daily use. Considering safety and weight, as the screen of iPhone12 pro max is the largest ever <6.7 inches (2778 x 1284), the stainless steel case is a good choice.

In addition, iPhone is often criticized because of poor signal problems. Technically speaking, with the advent of the 5G era, the public's requirements for signals are indeed becoming more and more demanding. It is also because in order to realize the wireless charging function, the shell is designed with stainless steel, and this will also improve the signal service. Materials with excellent structural properties (such as stainless steel or titanium alloy) will be widely used in 3C products to maintain the strength of the body and support the large screen.