The “stainless steel foil” produced by SXTG Stainless Steel Technology Group, a leading manufacturer of precision stainless steel products in China, is only 0.02 mm thick.
It is not difficult to manufacture stainless steel foil. What is difficult is the abnormal technical requirements of stainless steel foil. For example, the thickness accuracy cannot exceed 0.001 mm, the width accuracy is required to be in the range of 0.1 mm, the surface roughness is very high, and the crystal grain size is also extremely high. For example, for strips with a thickness of less than 0.025 mm, the grain size requirement is 7-9, because it has a decisive influence on mechanical properties such as tensile strength, toughness, and plasticity.
Because the precision stainless steel belt requires precision, mechanical properties, surface roughness, brightness and hardness and other indicators, unfolding the steel foil can almost be used as a mirror. Of course, it also makes manufacturing extremely difficult. The manufacturing technology of stainless steel precision steel strip represents the industry’s top technology. Generally, 20-high rolling mills are used to manufacture this kind of abnormal grade strip steel, which has thickness and surface quality control and mechanical properties. Quite an advantage, but it’s not enough to have manufacturing equipment, you have to have technical talents for craftsmanship and strip steel manufacturing!
China invested in the construction of a precision strip production line in 1998, but in the early stage it was unable to produce precision stainless steel strips of about 0.01-0.1 mm, and could only import.
Precision stainless steel strip foil rolling process
The technical indicators of precision stainless steel foil are extremely high, which also makes the steel strip excellent in performance indicators, such as high strength, corrosion resistance, oxidation resistance, abrasion resistance, heat resistance and light resistance, exquisite appearance and easy processing, so It has become an important part of improving product style. For example, in 2015, domestic precision stainless steel strip material passed Apple’s certification and became the logo material for manufacturing iPhone and iPad!
Application of precision stainless steel strip steel foil
Of course, the use of precision stainless steel foil is not limited to the production of Apple LOGO. It is used in engine combustion chamber accessories that require high temperature resistance and high material requirements, as well as lithium ion batteries. The former requires high temperature resistance and the latter requires corrosion resistance. The thickness and strength performance have extremely high requirements!
In addition, precision stainless steel foils are also used in future folding screen mobile phones. Of course, folding screens have not yet become the mainstream, but various mobile phone manufacturers are sparing no effort in research and development. The perfect cooperation of this precision strip steel and flexible screen will Let the phone screen be folded 200,000 times without breaking!
High-end precision stainless steel foil has great potential for use in aerospace, petrochemical, IT, medical equipment, and instrumentation fields.