In 2019, the more popular concepts of mobile phones are 5G and folding screens. Mobile phone giants such as Huawei and Samsung have successively launched new foldable smartphone concept products. In 2019, it can be described as the “first year of folding screens”.
The advantage of a folding screen mobile phone is that it can take into account both the large screen and the small screen. However, whether folding screen mobile phones can become the mainstream models in the future, there are still many problems that need to be solved. The important issue is the screen life. A folding screen mobile phone must have a layer of metal film as a substrate between the bottom of the screen and the mobile phone’s motherboard to increase the bendable life of the screen.
So how many times can the screen of the future folding screen mobile phone be folded without being damaged?
200,000 times!
At the special press conference of the State Administration of Shanxi, SXTG’s flexible screen steel foil became the focus of Chinese and foreign media. SXTG’s flexible screen steel foil will be used for domestic folding screen mobile phones. The flexible screen steel foil can be folded 200,000 times without deformation, breakage, and flat as ever. Assume that consumers fold their mobile phone screen 50 times a day, and the service life of flexible screen steel is about 10 years.
This “hand-scratched steel” for folding screen mobile phones is called “flexible screen steel”, which is a wide-range soft stainless steel foil and belongs to high-end products in the field of stainless steel strip. Different from conventional stainless steel sheet, stainless steel precision strip refers to cold rolled stainless strip with special ultra-thin specifications. Its thickness is generally between 0.05 mm and 0.5 mm. Below 0.05 mm, it is called stainless steel foil. At present, most of the soft stainless steel in the market is 0.05 mm.
SXTG`s Hand Tear Steel is the world’s ultra-thin stainless steel, with a thickness of only 0.02 mm, which is equivalent to a quarter of the thickness of ordinary A4 printing paper. It can be torn apart by just tearing it. The so-called “hand tear steel”.
Compared with ordinary aluminum foil, this ultra-thin hand-tear steel has better corrosion resistance, moisture resistance, light resistance, especially heat resistance. It is mainly used in places with high temperature resistance and material requirements, such as the blades of the combustion chamber of a jet engine and the coil of a lithium ion rechargeable battery. The high temperature of the combustion chamber is very high, and the lithium-ion battery material is highly corrosive. This has strict requirements on the thickness and performance of the material, and the excellent performance of hand-tear steel meets this demand.
Previously, because of the difficult process control and high product quality requirements, the core manufacturing technology of hand tear steel has been in the hands of developed countries such as Japan and Germany. In order to break foreign technical barriers, SXTG officially established a “hand tear steel” technical research team in 2016.
Core equipment of hand tear steel-precision strip rolling mill
Put a roll of original steel strip into the rolling mill, and the roller will roll the strip from thick to thin like a rolling pin … The working principle of the rolling mill does not seem to be complicated.
Two years and 711 experiments, from more than 40,000 possible roll arrangements, SXTG experts finally found a way to roll out hand-tipped steel thinner than paper. Now it has developed a flexible screen steel that is more tough than the first-generation hand-tear steel. At present, SXTG has become one of the few companies in the world that can produce a wide range of “hand tear steel”, breaking foreign monopolies.
Compared with the narrow hand-tipped steel with a width of 350 mm to 400 mm produced by Japan, Germany and other countries, the 600 mm wide hand-tipped steel developed by Taigang Precision Strip is a cutting-edge product that is higher than the industry standard and has been hotly received by the market. Hold. Hand-tipped steel will be used for the flexible display substrate of domestic folding screen mobile phones, but currently this phone is not yet known which one, even the brand name is also in the stage of strict confidentiality.
Nowadays, in addition to the perfect application on flexible displays, hand-tipped steel is also widely used in high-tech fields such as flexible solar modules, sensors, and energy storage batteries, and many fields have already occupied considerable market shares.
The new materials industry is a strategic and basic industry and a key area for high-tech competition. We must catch up and catch up. At SXTG, new materials with innovative spirit are in short supply.
In addition to hand tearing steel, SXTG also has many high-end stainless steel products, such as nib steel used in the nib, carbon fiber that can be used in the aerospace field, and duplex stainless steel used in the Hong Kong-Zhuhai-Macao Bridge. “Strength of China” with innovation, change and tenacity.