In the past few years, the stainless steel middle frame is the most widely used in apple series of mobile phones. Why is the stainless steel so popular in apple mobile phones? The following points are summarized:
1. The thermal conductivity and expansion coefficient of stainless steel and glass are very similar. Therefore, the iPhone uses stainless steel and glass as a combination, which has the advantages of corrosion resistance and white and bright appearance, and conforms to the positioning of the iPhone product in terms of height;
2. Compared with aluminum alloy, stainless steel has poor heat dissipation. But through stainless steel process compounding, it can achieve low specific heat capacity and fast heat dissipation, especially in the era of 5G non-metallic back cover. For example, the iPhone x uses stainless steel clad aluminum;
3. Among high-end materials (ceramics, titanium alloy, carbon fiber, etc.), stainless steel has strong comprehensive advantages, such as post-processing process and cost;
4. For the so-called high processing cost, tool wear, CNC equipment requirements and other problems, it is not a problem for apple, which is an absolute local magnate. Apple's positioning is more about product quality and appearance effect;
5. In addition, we have mature experience in mass production of stainless steel middle frames. For example, the early iPhone 4 and the iPhone x released in 2017, all used stainless steel middle frames!
PVD (physical vapor deposition) technology is the mainstream of surface treatment process of stainless steel. After "sandblasting, wire drawing or polishing + PVD", it has the advantages of dense and uniform coating layer, strong adhesion, good plating property, fast deposition speed, low treatment temperature and wide range of plating materials.
With the continuous promotion of Apple mobile phones, the stainless steel middle frame is bound to become the mainstream trend. At present, domestic mobile phone manufacturers have also adopted a large number of mobile phones. For example, mobile phones using stainless steel (austenitic SS304 and austenitic SS316), represented by Xiaomi's high gloss stainless steel and hammer's all metal stainless steel without breakpoint mirror surface, will have a great impact on and promote the stainless steel industry.
Soaring, bursting cabins, and still out of stock, the order will be placed in March next year!
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