Focusing on problem solving, and thanks to its conversion processes, Metallurgica Alta Brianza S.p.A. is qualifeid to offer products in a wide range of sections, steel grades and finishings. From several points of view, this characteristic makes our Company a unique supplier and a very reliable partner.
Standard supply condition: +C (cold drawn) Upon request: +A+C (soft annealed + cold drawn) or +AC+C (spheroidized annealed + cold drawn)
The following items are always available in stock, checked Class 3 (EN 10277:2018 - Prospetto 3)
The following items can be supplied checked Class 2/3 upon request (EN 10277:2018 - Prospetto 3)
Rounds and Hexagons in further grades of steel can be checked in Class 2/3 upon request.
Free cutting steels are very popular because of their easy machinability on high-cutting-speed machines.
The main features of free cutting steels are the easily removal of material’s chips when machined, thanks to the presence of Sulphur (S) in percentages that can reach 0.40%, and the content of Lead (Pb) up to 0.35%, that acts as a self-lubricant on material during the machine processing.
Hot rolled material is purchased according to EN ISO 683-3 whereas cold drawn material is sold according to EN 10277: 2018
These kind of steels are divided in three categories:
* STANDARD STEEL GRADES AVAILABLE IN STOCK
All the other indicated steel grades include production on request with minimum quantities to be agreed
Steels for general engineering use are commonly used in different sectors: carpentry, furniture, bolts, hardware, machinery for industrial application, etc.
They are purchased according to the European standard EN 10025-2 (Steels for structural uses) and after drawing they are sold according to EN 10277: 2018 (Steels for general engineering use).
Steel designation is as follows: S235JRC, S355J2C, E335GC, E295GC, C10, C15.
* STANDARD STEEL GRADES AVAILABLE IN STOCK
All the other indicated steel grades include production on request with minimum quantities to be agreed
Case hardening steels have a relatively low carbon content, generally no more than 0.2%.
Nickel, Chrome, Molybdenum and Manganese could be included with the purpose of conferring strength and toughness.
These steels are mainly used in the construction of mechanical parts that risk to wear, such as gears, pins, shafts, etc.
A thermochemical treatment characterizes this steel grade, promoting a carbon enrichment of the surface layer and making it particularly hard. A hardening and tempering treatment give the pieces high resistance to surface wear, fatigue and good core toughness.
Hot rolled material is purchased according to EN ISO 683-3 whereas cold drawn material is sold according to EN 10277: 2018
Examples of case hardening steels: C10E, C10R, C15E, C15R, 16MnCr5, 16NiCr4, 17NiCrMo6-4.
The production of the indicated steel grades is on request with minimum quantities to be agreed
Steels for quenching and tempering are divided into: non-alloy steels and alloy steels; they have the best compromise between mechanical strength and toughness. They are mainly used for mechanical components, for which good impact and vibration resistance properties are required (for example, connecting rods, pins, shafts, levers, etc.).
We could say that the percentage of carbon varies between 0.21% and 0.60%.
There are many steel grades available on the market with only carbon content (eg. C45E-R) or with alloy elements in variable percentage (Ni, Cr, Mo, Mn);
Alloy elements have the following functions:
These steels are usually tempered in water or oil at about 620 °C.
Examples of non-alloy steels for quenching and tempering: C35E, C35R, C40E, C40R, C45E, C45R
Examples of alloy steels for quenching and tempering: 42CrMo4, 25CrMoS4
Hot rolled material is purchased according to EN ISO 683-3 whereas cold drawn material is sold according to EN 10277: 2018
*STANDARD STEEL GRADES AVAILABLE IN STOCK
All the other indicated steel grades include production on request with minimum quantities to be agreed
100Cr6
This steel grade with a high carbon and chrome content achieves high hardness, good resistance to deformation and wear. It is used for the production of balls, needles and bearing rings.
Supply condition:
Hot rolled material is purchased and afterwards drawn according to EN ISO 683-17, dimensional tolerances and bar lengths according to EN 10277: 2018
Production only on request with minimum quantities to be agreed
Cold drawn from roll or bar.
Diameter from 3 to 100 mm.
Usually supplied untreated, in 3 to 6 m commercial lengths.
Special lengths on request.
Grinding round bars on request.
Cold drawn from roll or bar.
Sections from 4 to 75 mm.
Usually supplied untreated, in 3 to 6 m commercial lengths.
Special lengths on request.
By extrusion from a roll or bar.
Sections from 4 to 80 mm.
Usually delivered in a raw state and commercial length from 3 to 6 m, but on request can be supplied in fixed lengths.
Each product is executed custom marking for the customer.
The steels can be supplied on request with chamfered ends.
By extrusion from a roll or bar.
Sections from 15 to 300 mm.
Usually delivered in a raw state and commercial length from 3 to 6 m, but on request can be supplied in fixed lengths.
MAB guarantees the restricted tolerance h11, and not h12, even on thicknesses smaller than 18 mm for cold drawn flat bars with widths over 150 mm, despite what allowed by EN 10277: 2018 table n. 12 note B.
MAB also guarantees h11 tolerance on thickness for grades of steels with C (Carbon) over 0.20% (C.45, C.40, C.35, ..), despite what allowed by EN 10277: 2018 table A, which provides for an increase in the tolerance allowed on thickness of 150% of what indicated in the same table.
By extrusion from a roll or bar.
Usually delivered in a raw state and commercial length from 3 to 6 m, but on request can be supplied in fixed lengths.
Upon customer request, the steel rod obtained by drawing can be supplied with special profiles, profiles drip edges round, polygonal.
The entire range of production of drawn bars can be supplied with galvanic zinc plating.
By extrusion from a roll or bar. Usually delivered in a raw state and commercial length from 3 to 6 m, but on request can be supplied in fixed lengths. Each product is executed custom marking for the customer. The steels from 6 to 75 mm are supplied with beveled ends.
An innovative production process gives to this range of cold drawn round bars from 15 to 45 mm. Special characteristics: a perfect bar end and a very high surface quality.
Thanks to an innovative in-house developed testing system we are now able to detect longitudinal surface defects on hexagonal bars, which can not be intercepted by using traditional testing systems with rotating probes used for round profiles.
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