The Stainless Steel
For the construction of the steel products we use stainless steel AISI 304 (type 18/10), an alloy composed of 18% chromium, 10% nickel and a percentage of carbon not exceeding 0.03%.
The stainless steel is defined by its resistance to corrosion, as permitted by the formation at the molecular level, on its surface, a thin film of chromium oxide formed by a combination of chromium, contained in steel, with oxygen in the air.
The nickel addition to improving the corrosion resistance considerably increases the ductility, namely the property of letting permanently deformed without breaking.
The corrosion resistance of stainless steel, however, can be reduced by any external cause that prevents the formation of the film of chromium oxide, in particular by the stay on the surface of foreign materials such as food residues, salts, etc.
It is not, therefore, correct to think that stainless steel is indestructible and does not corrode; its strength and durability is determined by both the right selection and processing by the producer by both the proper use and maintenance by the consumer.
There are, in fact, materials and products which, in contact with the stainless steel, produce an alteration of the surface.
However, by following the appropriate instructions for use and maintenance, you can avoid the occurrence of any inconvenience.
The production of steel by melting starts, at the top of the oven (a plant in the shape of a truncated cone tower that reaches thirty meters high), of the iron mineral, magnetite generally, from the mines of Upper Silesia (Poland), Ruhr (Germany), Pennsylvania (USA), Elba Island and Cogne in Italy. At the temperature of 1200° C the furnace produces cast iron in the liquid state which is subsequently transferred at specific installations, the Bessemer converters, which, by burning and blowing air from numerous nozzles, reduce the carbon content, thus transforming the liquid bath from cast iron to steel.
With appropriate additions of metals are obtained special steels and stainless steels between these, which are particularly characteristic of not being attack by oxides (rust) in the presence of chemical agents.
The most commonly used metals in the alloy to form stainless steels are mainly nickel and chromium in variable percentages, depending on use, with the addition of small percentages of copper and molybdenum.
The bath liquid, modified with metals to form the alloy steel, is poured into suitable molds calls ingot, from which, after cooling and subsequent solidification, the ingot is extracted which, with suitable laminations, is processed into sheets or profiles various forms.
The stainless steel used for producing tableware and cutlery is of various types:
(The abbreviation AISI - the initials U.S. legislation - American Iron and Steel Institute - now recognized internationally).
Tips for washing
You should wash the product thoroughly before each use, using appropriate detergents for cleaning by hand or in the dishwasher.
For products of gold, if washed in the dishwasher, we recommend a program of washing up to 50°.
In the dishwasher, to avoid the appearance of small spots of corrosion on the knives, put the same into a basket to part and, after washing, thoroughly dry. Do not keep it to soak knives and cutlery or other metal objects.
In the event that, following washing in the dishwasher, made on the advice of washing should appear however small black spots on the knives, you need to verify, by a technician, the correct middle ground of the electrical system of your dishwasher.
Manufacture of cutlery
The company buys steel from steel mills that provide it in coils or plates (sheets) from 1x3 meters in thickness from 0.8 to 4 mm. For cold work (tableware and cutlery) or round bars of different diameters for the hot working of knives. For the production of cutlery (spoons and forks ) is used AISI 304 stainless steel with a percentage of 18% chromium and 10% nickel.
The process is called cold because all the plastic deformation, ie, the stretching of materials are carried out without heating up the "piece". Mori Italian Factory uses for cutlery plates 2 to 4 mm thick.
Is guessed that the thickness higher (for example cutlery Ella Geo and 4 mm) gives more value to the object, and because the processing is more complex, and because the weight and, consequently, the cost of the raw material greatly increase the benefit of aesthetics and durability.
For this reason, we recommend that you always check the thickness of the cutlery: remember that your customers!
Production cycle of cold work of cutlery (except knives) from sheet or coil:
Processing of tableware
Is used in stainless steel 18/10 (304) slabs of thickness ranging from 0.8 to 1.2 mm, Ordered by specifying the steelworks use "for tableware" because the plates must have a surface free from pinholes and other aesthetic defects.
All of the plastic deformation in order to obtain the desired shapes are performed in the cold, by interposing, between the molds and sheets to print, a thin film of lubricant to prevent scratches on surfaces.
Production cycle of tableware, for example the tray model Bombè:
A curiosity: the steel AISI 304 18/10 is not attracted by the magnet, while the AISI 420 18/C is magnetized to try it to believe it!
Is used stainless steel 18/10 (304), in discs with thickness of 1.5 mm. Specific for deep drawing, to the body of the pot, aluminum discs with a thickness of 3 mm for the bottom and stainless steel 18/C (AISI 430) for the base covering.
All plastic deformations to obtain the cylindrical body of the pot, are performed, as well as for the tableware, cold, exercising a static pressure and interposing between the molds and the discs to print a thin film of lubricant to avoid scratches on the surface.
A curiosity: The fund stainless steel 18/C (AISI 430) means that the pots can also be used with induction hobs.
It is used specifically for aluminum to be coated with non-stick cookware discs or plates with a thickness of 3.5 mm, suitable for contact with food.
Even for the aluminum cookware, all plastic deformations occur at cold and interposing between the molds and the discs to print a thin film of lubricant to avoid scratches on the surface.