![]() ![]() This is also the home of an unrivalled collection of historical and modern clocks and watches, a horological library and valuable archives. Our short courses take place in Upton Hall in Nottinghamshire, in workshops with professional tools, machines and equipment. Choose between short, practical courses, or longer distance learning programmes through which you can, if you wish, take exams to qualify as a professional watchmaker or clockmaker. Video directed, filmed and edited by Peter Hatter ( Whether you are a beginner or an expert, a professional or an enthusiast, the BHI has a clock or watchmaking course that will suit you. Stainless steel 904L can withstand extreme conditions such as heat and chemical aggression.Getting Started for beginners and professionals As a result, it is more resistant to impact, scratching and corrosion. With a low carbon content, 904L stainless steel contains a higher content of chromium, nickel, molybdenum, copper, manganese and silicon compared to 316L stainless steel. Stainless steel 904L This is the stainless steel used exclusively by the Rolex brand. This hardens the alloy and allows the stainless steel to withstand extreme environments: chlorinated, salty and acidic. Also called marine stainless steel, 316L differs from 304 stainless steel by the addition of 2 to 2.5% Molybdenum. 316L steel contains approximately 17% chromium and 10 to 12.5% nickel with a low carbon content of no more than 0.02%. Stainless steel 316L The letter L stands for "low carbon" and indicates that there is a low presence of carbon. It is not resistant and not suitable for a salty environment such as salt water in the sea for example. However, even at low cost, it is easy to corrode and largely sensitive to acids. 304 is often used because of its relatively low price. It has good corrosion and heat resistance. ![]() Versatile, 304 stainless steel is easy to clean. It has a low manganese and carbon content. Stainless steel 304 Apart from iron and carbon, 304 stainless steel contains approximately 18 to 20% chromium and 8 to 10.5% nickel. This forms a protective barrier that prevents rusting and blackening. It allows the formation of a dense transparent oxidation layer or film on the metal. Indeed, chromium gives steel antioxidant properties. Why does stainless steel not rust? Stainless steel does not rust because of the presence of chromium oxide. Ecological Robust Recyclable Does not rust An alternative to certain materials such as 925 silver: it keeps its shine for a lower cost. What are the advantages? Stainless steel has a few advantages if you're into jewelry and watches: Resistant and strong Gravable and malleable when hot Hypoallergenic: it does not cause any reaction in contact with the skin except for extremely rare cases. In compositions, stainless steel can also contain manganese, molybdenum, tungsten, titanium, niobium and silicon. Currently, the European Parliament directive requires that the release rate of nickel should not exceed 0.5 micrograms/cm2/week for items that come into direct and prolonged contact with the skin. For example, since 1989 Rolex has been using a steel with a high degree of hardness made only in Sweden: the 904L It is now promoting the merits of an "Oystersteel" steel, which is none other than the 904L steel that is essential in the medical world for its virtues.įor steel to become stainless, the content of each component must be at least 50% for iron, 10.5% for chromium, 1.2% for carbon and 8% for nickel. The technical differences make it possible to analyze the steel according to the external or internal physical conditions. The steel used in the watchmaking world arouses a lot of envy. To help you see more clearly, here are some characteristics of this material so exploited by the manufacturers of timepieces. Stainless steel is widely used as a basic material in watchmaking, both for the case and the bracelet of a watch. What does it contain? Is it resistant? Is there a difference between the different types of steel? Is this material hypoallergenic? What do these numbers and letters mean? And many more. ![]() When one wishes to acquire a steel watch, it happens that one asks oneself a thousand questions. ![]()
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