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Oystersteel belongs to the 904L steel household, which is particularly immune to corrosion and acquires an distinctive sheen when polished. The two steel grades are comparable in appearance, chemical makeup and characteristics. Both steels are sturdy and supply glorious resistance to corrosion and rust.

Steel Vs. 316l In Watchmaking Industry

What makes the grade 316 alloy an ideal food grade metal sheet material is the truth that it has a excessive resistance to acids, alkalis, and chlorides (corresponding to salt). Other austenitic stainless steels, such as grade 304 SS, can expertise severe pitting corrosion when exposed to salt, which is commonly present in food products. A Rolex watch must work perfectly and preserve its beauty even in the harshest environments. That is why Rolex makes use of Oystersteel, a metal alloy specific to the model.

The chromium, molybdenum and nickel contents of 904L provide a greater chloride pitting corrosion resistance than that of 316 stainless in many environments. Another main distinction between 430 and 316 stainless-steel is that grade 430 SS is a ferritic alloy, that means that it’s magnetic by default. Ferritic alloys like 430 SS also have extraordinary resistance to stress corrosion cracking (the expansion of crack formations that may trigger sudden failure in corrosive environments).

Grade 904L stainless steels have excellent resistance to warm seawater and chloride attack. The high resistance of grade 904L against stress corrosion cracking is as a result of presence of high quantities of nickel in its composition. Moreover, the addition of copper to these grades develops resistance to sulphuric acid and other decreasing agents in each SA240 316 Stainless steel plate aggressive and delicate conditions. Grade 904L chrome steel is a non-stabilized austenitic stainless steel with low carbon content material. This excessive alloy chrome steel is added with copper to enhance its resistance to strong lowering acids, corresponding to sulphuric acid.

Why does Rolex use 904l steel?

Rolex calls 904L stainless steel a “corrosion-resistant superalloy.” 904L differs from 316L because of extra Chromium, Molybdenum, Nickel, and Copper which gives it improved resistance to acids. 316L is considered a tougher, harder, “marine grade” steel, but it does not have luster and acid resistance of 904L.

  • Until the widespread use of stainless steel, older watches utilized primitive stainless casebacks and a few type of base-metallic case.
  • Once received from Rolex’s steel suppliers, Rolex casts and scans it utilizing an electron microscope that’s capable of detecting the slightest structural or floor defect.
  • Rolex has been known to send metal again when it doesn’t meet their exacting specifications.
  • 316L is taken into account a more durable, tougher, “marine grade” steel, but it does not have luster and acid resistance of 904L.

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The steel is also resistant to stress corrosion cracking and crevice corrosion. Grade 904L is non-magnetic, and provides excellent formability, toughness and weldability. Sorry guys but “Rolesium” is NOT an alloy, quite it is a mixture of two different metals featured in the same watch. For example within the presented Yacht Master the case is a 904L stainless-steel and the bezel is a solid 950 platinum. Rolex uses ruthenium for his or her platinum alloy which contains ninety five% platinum and 5% ruthenium.

304 stainless steel is essentially the most versatile and extensively used austenitic chrome steel in the world, as a result of its corrosion resistance. 304 stainless is also cheaper in price in comparison with 316, another reason for its reputation and widespread use. When you notice a Rolex Submariner, you can take the world in a sweep. The watch epitomizes every little thing that is identified for precision. It is critical to mention that that is the first waterproof wrist watch designed for a depth of one hundred meters.

Example – Datejust with “two tone” bracelet, s/s case and gold bezel – this would be a “Rolesor” Rolex. 904L stainless steel stockholders and suppliers, delivering to the whole of the UK.West Yorkshire Steel are suppliers and stockholders of 904L chrome steel bar and plate. This grade is an austenitic stainless-steel specification offering reasonable to excessive corrosion resistance. Its high alloy composition provides good resistance to pitting and corrosion in a variety of environments. The low carbon content of 904L improves its welding traits.