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Cold drawn steel bars

MAB’s plant is the result of the rigorous investment strategy that has allowed a constant renewal of the production lines, in order to keep them up to date with the most modern technologies.

product range

  • Round bars from 3 to 100 mm
  • Hexagonal bars from 5 to 75 mm
  • Flat bars from 15 to 300 mm
  • Square bars from 5 to 80 mm
  • Special Profiles
  • Marked bars
  • Galvanized Bars

SURFACE QUALITY TESTS AND CLASSES

M.A.B. has recently invested on surface quality tests, making itself ready to meet much more demanding requests from customers. In our warehouse you can find the following items in Class 3 according to EN 10277: 2018, Tab.3:

  • Round bars in quality 11SMnPb30/37 from 5 to 45 mm
  • Round bars in quality 36SMnPb14 up to 42 mm
  • Hexagons in quality 11SMnPb30/37 from 8 to 41 mm
  • Hexagons in quality 36SMnPb14 from 8 to 38 mm
  • Upon request, we can also test round bars up to 100 mm and hexagons up to 65 mm

The production of class 3 hexagons, not included by EN10277:2018 that stops at a lower surface quality class (Class 2), has been a significant result obtained thanks to the close collaboration of the manufacturers of eddy current equipment.

We have developed a new testing system also for round bars (drawn, not peeled) which allows to obtain a surface class higher than class 3, which is the maximum required by EN10277:2018.

Here are the important innovations we have made in our production process of round bars from 15 mm to 30 mm:

On request, thanks to the insertion of several surface tests made with different instruments, combined with other innovative design features that allow us to control the end of the bars, we managed to reduce the surface discontinuities permitted by EN10277:2018 for class 3 by at least 10 times (from 1% to 0.1%). Customers, who have been using these products for over a year, have found very few pieces with superficial discontinuities (close to zero) and that fact makes us believe we are on the right path.

Finally, we will shortly introduce an innovative testing instrument for hexagons, designed to better intercept the so-called long defects present on the edges of the bar, which are hard to identify with the classic Defectomat.

FREE CUTTING STEELS

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:

  • Steels not intended for heat treatment: 11SMnPb37, 11SMnPb30, 11SMn30 and 11SMn37. Upon request, they can be supplied with the addition of elements such as Tellurium (Te), Bismuth (Bi), in order to improve workability on machine tools.
  • Steels for quenching and tempering: 36SMnPb14, 35S20, 44SMn28, 46S20, etc.
  • Case hardening steels: 10S20, 10SPb20, 15SMn13, etc.

* 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

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

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

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:

  • Nickel: promotes toughness and hardenability;
  • Chrome: favours hardenability;
  • Molybdenum: works against the development of fragility when tempering;
  • Manganese: improves hardenability;
  • Vanadium: refines the crystalline grain.

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

STEELS FOR BALL BEARING

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:

  • +AC+C = Globular annealed + Cold drawn
  • In order to improve the workability the Sulphur content is controlled (S = 0.020 ÷ 0.030%)

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

Round bars

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.

Hexagonal bars

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.

Square bars

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.

Flat bars

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.

Special profiles

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.

Galvanized bars

The entire range of production of drawn bars can be supplied with galvanic zinc plating.

Marked bars

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.

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