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Stainless steel: Why doesn't it rust?

Why stainless steel doesn't rust?

Stainless steel, stainless steel, steel 316L what differences?

The steel is an alloy of metal consisting mainly of iron but also of carbon. The carbon added between 0.02% and 2% transforms iron into steel and makes it even more resistant but also gives it a certain "flexibility," which is why steel is widely used for construction. At this stage steel is not a stainless alloy. Beyond 3% of carbon, iron becomes cast iron but this large amount of carbon makes this metal very hard but also brittle. This is why at present iron is almost not used in its raw form but almost automatically converted into Steel.

 

Steel an oxidizable alloy

The steel crude is a oxidizable alloy. It will naturally bind with oxygen molecules present in air or water through oxidation-reduction reactions. This reaction is more commonly referred to as "corrosion». These reactions result in the appearance of iron oxide and hydroxide, also called iron hydroxiderust, this famous red-orange substance found on some iron structures. The rust is a destructive agent that use the steeland leads initially to the creation of small holes on the surface of a steel element, until the latter is completely decomposed. Hence the need to create a long-lasting alloy escaping these reactions.

 

From steel to stainless steel without rust!

Strauss and Maurer, two German chemists, filed a patent in 1912 to exploite first stainless steel, a learned mixture between steel, chromium (the discovery of which dates from 1797 is attributed to French Nicolas Louis Vauquelin) and nickel (discovered in 1751 by Axel Frederik Cronstedt), which makes the steel very resistant to corrosion and prevents it from rusting. The Chromium content of thestainless steel is at least 10,5%, its carbon content must be less than 1,2% and its nickel content approximately 8%.

 There are 3 categories of stainless steel: ferritics, martensitics and austenitic stainless steels.

What are the characteristics of 316 and 316L steel?

The steel 316L is a type ofaustenitic stainless steel where the carbon content does not exceed 0,02%, the amount of chromium is around 17% and the nickel content reaches 10 to 12,5%. 2 to 2.5% of molybdenum is added to this alloy.

The L of the abbreviation 316L means that it is a Low carbon steel (low carbon). As mentioned above, this steel contains only 0.02% of carbon compared with 0.05% for "conventional" steel 316. During very high temperature welding, a substance called "chromium carbide precipitation" is created and therefore the steel although stainless becomes more prone to corrosion. The fact of having a minimum of carbon in the structure of this alloy prevents the creation of this precipitation and therefore the steel is not subjected to corrosion.

Molybdenum, discovered in 1778 by Carl Wilhelm Scheele, is added to thestainless steel to form thesteel 316L.On the one hand Molybdenum hardens the alloy but above all makes it very more resistant corrosion and the same in extreme environments (chlorinated, salted, and acidic environments) which allows the steel not to rust. For this reason, thesteel 316 L is also used for external manners as bodyguards or handrails.

Why 316L in our watches?

For all of our watches man and of our watches woman we made the choice to work with thestainless steel 316L. You will have understood this alloy is recognized for its durability and also its high corrosion resistance, 2 elements that we consider essential for the casing of our mechanical watches. From an aesthetic point of view, thesteel 316L is a stainless steel whose brilliance continues over time and does not tarnish.

Finally l’steel 316Lrecycles very easily and completely. Thus stainless steel watches can have a new life. Stainless steel can be recycled infinitely without losing its quality. Commitment from an ecological point of view being part of the strong values of Charlie Paris, it is naturally that we have turned to this type of steel for ourMade in France watches

 automatic stainless man watch

fit stainless man



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