Fonderie Viterbesi produces castings mechanical steel and cast iron in many fields of application ranging from automotive to the plumbing industry, by rail mergers for machine tools.
Leading role played by mergers for the industry of heat with the production of cast iron fittings, doors, floors stoves, grills, cast iron cast iron fireback for fireplaces, braziers, suction cups and each type of component designed and manufactured to withstand high temperatures.
The know-how acquired over the years allows us to conceptualize, design and produce castings in gray and ductile iron, steel, stainless steel and aluminum providing the customer with a complete service from design to delivery of the product.
Fonderie Viterbesi has a machine capable of being able to perform any kind of mechanical processing request and executes daily rigorous controls on the material to ensure 100% of the quality of the product supplied.
The manufacturing process of sand casting allows the production of both a series of products or a singular production with weights that can vary from a few grams to many tonnes.
The casting technique consists mainly in preparing a cavity called a “mould” which is a copy of the negative of the piece being made. The alloy is poured in its cast state. Once it has solidified, the alloy is extracted from the mould in its unrefined state. It is very similar to the final piece but lacks some machining allowances (the parts to be taken away by the machine tools so that functional surfaces can be made).
The sand casting (or green method) can only be carried out once and is destroyed after the unrefined form is extracted (see diagram).
Steel is an alloy of iron and carbon which contains a percentage of carbon that is less than 2% and even smaller percentages of other elements such as silicon, manganese, sulphur and phosphorus. The mechanical characteristics of the various types of steel mainly depend on their chemical composition, but particularly on the quantity of carbon present and on its distribution in the iron and on the added iron alloys and the thermal treatment it undergoes.
Cast iron is a ferro-carbon alloy with a purport of carbon between 2.11% and 6.69%. It is obtained from the transformation of haematite in blast furnaces. During the solidification the carbon separates from the metallic mass and is presented as graphite which is dispersed uniformly under the form of thin layers.
Grey cast iron is an excellent conductor of heat which offers high resistance to corrosion and to usury.
It is for these qualities that cast iron is optimal for manufacturing of heating systems with high performance either on fireplaces, stoves and thermo fireplaces.
Cast iron firebacks diffuse the heat by irradiance, this means that they store up the heat and then release it gradually.
Once turning off the fire all cast iron firebacks maintain the heat for long and keep irradiating warmth in the surrounding environment. As the heat outturn from pellets and woods increases the energetic consumption is greatly reduced.
Cast iron continues to emit an amount of heat greater than 60 ° for one hour after shutdown (pt4), continuing to heat up for another hour (item 6). We will then have a total of 2 hours of heat of the plate for more than 2 hours after the stove is switched off.
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Detail of steel casting micrography
Steels are divided into 2 fundamental groups: steels which are chosen based on their mechanical characteristics or use. There are also steels that are chosen according to their chemical composition. There are many denominations established by appropriate technical regulations: in Europe the Euronorme (EN) are laid down by the European Committee of Regulations (CEN), and in America by the ASTM (America Society Testing Materials), in collaboration with the AISI (American Iron and Steel Institute) and on an international scale by the ISO (International Standard Institute).
The influence of the binding elements
Silicon: aids the formation of graphitic carbon; it improves its workability with machine tools; it lowers the casting temperature rendering the alloy more fluid.
Manganese: favours the formation of carbon under the form of cementite; it carries out a de-sulphurizing action; it induces an increase in the breaking load and hardness and raises its level of hardenability.
Phosphorous: influences the temperature at the end of the solidification and increases the castability of the alloy; it considerably reduces the mechanical properties of resistance and resilience.
Sulphur: interferes with the formation of the graphite; it induces suction and blow-holes; it influences the mechanical and technological properties in a negative way.
Molibdenium: aids the the hardenability; it reduces the possibility of cracks and distortions.
Nickel: decreases the sensitivity to thickness; It improves its resistance to use.
Chrome: improves the mechanical resistance; it reduces the critical speed of cooling thus improving its hardenability.
Detail of grey cast iron micrography
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Fonderie Viterbesi s.r.l.
Headquarters and showroom:
05024 Giove (TR) ITALY
ph. +39 0744 99.56
fax +39 0744 99.56.15
p.i./tax code IT 00057110561
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