Although at present stainless steel has become a kind of material widely used in watch industry, it still belongs to a kind of high quality material. Stainless steel in the middle of the 19th century was found by the Krupp company in the Germany Essen, then in the 1950 s has been widely used by the public. As expected, Hublot watch used this kind of material when produced the V4A high quality alloy watches, and this kind of alloy in the watch industry was more widely known and also called 316L.
The 904L stainless steel that Rolex uses is a kind of heat resistant stainless steel alloy, which currently only being used in high-tech fields, such as aerospace, chemical and petrochemical industry, also used in surgical transplant. Its outstanding corrosion resistance can be comparable to a lot of precious metal material, because of its chrome content up to 21%. And its gloss will be more durable through a highly polishing.
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Manufacturing process of 904 l stainless steel of the Rolex is very strict. For the first casting, metal was melted to a vacuum container to remove impurities from the mold, these impurities will affect metal anti-corrosion property and cause problems in polishing process. Casting results can confirm the quality through electron microscope scanning. In the end, The casting products only by selecting carefully can be used in watch manufacturing.
Because this kind of steel is extremely difficult to damage as precious metals, but easy to polish, therefore it puts forward great challenge on manufacturing and stamping process, it must pass a special tool and craft to process, including the rolling steel plate, die stamping, then finally made the watch parts. For stamping at the same time, it specially developed the exceptionally hard tools, such as Tungsten carbide tools for wearing surface overlying.