What is stainless steel?
It is resistant to weak corrosive media such as air, steam, water, or stainless steel. The commonly used steel grades are 304, 304L, 316, 316L.
304/304L : low-cost representative
In addition to carbon and iron, stainless steel 304 also contains about 18-20% chromium and 8-10.5% nickel. It is widely used because of its relatively low price.
Advantages: low cost.
Disadvantages: easy to corrode and very sensitive to acid.
316/316L: high-end diving watch
On the basis of 304, the content of nickel (Ni) is more, and molybdenum (Mo) is added; the work hardenability is excellent (non-magnetic), but the 316L type is used for products that require a large amount of welding, because it is better than that under high temperature and high corrosion conditions. Type 316 is more stable, so 316L stainless steel is one of the materials used to make the most high-end watches and straps.
Advantages: corrosion resistance, acid resistance, diamagnetism.
Disadvantages: higher cost
904L: Rolex exclusive
904L contains more chromium, molybdenum and nickel, and then more copper, manganese and silicon than 316L. Generally used in the construction of pipeline systems, such as heating, pollution control and bleaching equipment, because it has high acid resistance.
Advantages: high corrosion resistance
Disadvantages: high cost
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