B500SP hot rolled welded mesh made of EPSTAL steel.

B500SP hot rolled welded mesh made of EPSTAL steel.

Welded steel meshes settled really nicely on the construction market. For many decades, they have been used at every stage of construction, from foundations to the ceiling. They are also increasingly used in the production of precast and concrete elements.
Their use allows for significant savings, both financial and time-related.
These advantages were noticed not only by construction managers, designers or fitters, but also by individuals building their own house.
Welded meshes win at every stage of reinforcement assembly. They are more comfortable, quickly cover the reinforcement area, and their installation is not as expensive as classic reinforcement elements.

Welded mesh is a technically advanced reinforcement element, used today in all areas of reinforced concrete, both on the construction site and when making reinforcements from semi-finished products. As an industrial prefabricated reinforcement, it is a mass and typical product. Designers and users have the opportunity, but also the task, to use the economic advantage of prefabrication so that building components and structures become cheaper. Due to the form of processing, the mesh was originally used only for reinforcement of building elements with flat surfaces. Today, it is increasingly used in a bent form in building elements other than flat shapes. The economic significance becomes apparent when comparing the increase in labour and material costs. The difference indicates a significant replacement of labour-intensive activities by industrial prefabrication.

The meshes eliminate a significant part of the manual works when laying reinforcements at the construction site, as they are produced in the factory on automatic welders. In building elements with flat surfaces, they require slight cutting and bending. In this way, they significantly contribute to the reduction of construction costs. Even greater reduction in the time of works occurs when using meshes in building elements with rounded surfaces – most often in the form of bending. When deciding on the type of reinforcement and the type of mesh used, you should always analyse what other factors affect the economics of construction.

However, until recently there were areas where it was not possible to use welded mesh made of cold roll steel B500A. Construction conditions, type of investments or constructors together with construction supervision did not allow this.

This problem particularly concerned engineering objects with variable stresses, and the grids could not be used in communication construction either.

Structures and types of meshes.

The meshes consist of reinforcing bars that cross at a right angle and are welded together at the connection points. The longitudinal bars are single or double, and the transverse bars are always single. By using double bars, the cross-section of the steel doubles.

Designations.

Abbreviated designations give the sum of cross-sections of longitudinal steel rods per meter of mesh width and placed before the letter used to indicate the type of mesh.
Q – meshes with equal cross-sectional area of the bars per 1 mb of the edge length in both directions
R – meshes with cross-sectional area of longitudinal bars approx. five times larger than bars with transverse direction

Welded meshes at the construction site.

Based on the order, the meshes are delivered to the construction site by trucks in marked packages. This ensures order at the construction site, which facilitates fast work progress. The meshes also have manufacturer’s designations, wire species, package number, mesh size, number of pieces in the package.

Welded mesh processing.

The mesh at the construction site can be cut or bent on suitable devices. Double laid, it is often used to strengthen reinforced concrete structure walls.

Production and quality assurance.

The production of welded meshes can only take place in plants with the appropriate welding equipment and certificates confirming the product’s compliance with the relevant standards and approvals. The above is the basic condition for admitting goods to trading on the construction market. The starting material for the production of welded meshes is the rolled metal formed and ribbed by cold rolling. The wires are joined by resistance welding after being straightened and cut.

The manufacturer is required to provide production technology to obtain the required properties of materials specified by the relevant standards and controlling them by internal and external supervision.

The internal quality department oversees every stage of production from the moment the batch is received until the welded mesh leaves the plant. Foreign audit includes all types of audits carried out by external certification bodies.

The idea of B500SP meshes made of Epstal steel.

To meet the expectations of designers, constructors or builders, the CMC company was the first to introduce the hot rolled mesh B500SP made of Epstal steel to the market for sale.

This is to facilitate work on the construction site. So that there would be no unnecessary changes to the steel in the project and that the entire investment would be made in one steel type.

At the same time, thanks to this, B500SP welded meshes can be used in areas where until now it has been forbidden to use mesh in the cold-coated B500A type.

B500SP welded steel meshes can be used to strengthen reinforced concrete structures operating under dynamic and repeatedly variable loads.

The scope of application of B500SP meshes:

road engineering facilities
railway engineering facilities
public roads
internal roads
"underground" urban railway construction facilities
civil airports

Conditions for using the B500SP meshes.

Reinforced concrete structures reinforced with mesh from B500SP bars can work under static and variable loads in the temperature range from -60 ºC to +100 °C as well as dynamic and repeatedly variable.

Utility properties of the B500SP mesh

Basic characteristics of the product	Declared utility properties
Yield border Re [Mpa]	≥ 500
Tensile strength to yield point ratio Rm/Re	1,15 ÷ 1,35
Total elongation with maximum force Agt [%]	≥ 8,0
Relative elongation A₅ [%]	≥ 16,00
Resistance to bending and unbending	no breaks
Shear force of the welded joint Fs [kN]	≥ 0,30 * A * Re
Resistance to fatigue with Ϭmax = [300 Mpa] and amplitude 110 [Mpa]	≥ 2 * 10⁶ cycles

Epstal steel.

The Epstal steel introduced to the Polish market has gained acceptance and trust among people associated with broadly understood construction.

It is worth quoting some basic information here about this steel:

B500SP grade designation:

B means steel for construction
500 means a yield strength of 500 MPa
S means weldable steel
P means steel with increased ductility

EPSTAL steel parameters:

Yield point Re [MPa] - 500 ÷ 625
Tensile strength to yield point ratio Rm/Re – 1.15 ÷ 1.35
Minimum percentage elongation A5 [%] – 16.0
Minimum overall percentage at maximum force Agt [%] – 8.0

EPSTAL steel combines the most important features for reinforcing steel:

high tensile strength (class A-IIIN)
increased ductility (class C)

Steel with high ductility, after exceeding the stress equal to the yield strength, becomes plasticized, i.e. it acquires properties that allow it to obtain very large deformations with even a small increase in stress. Therefore, its breaking occurs after reaching much larger elongations than the breaking of brittle steel in an analogical situation. This has a significant impact on the behaviour of the structure – if it is reinforced with high ductility steel, after exceeding the permissible load values, i.e. in an emergency situation, it suffers large deflections and scratches. These signs, which are easily visible to the users of the facility, alert about the impending danger, thus enabling evacuation and taking corrective actions that can prevent the disaster.

The B500SP meshes introduced for sale are offered as typical nets and manufactured to individual orders.

Typical B500SP meshes are offered according to the following type series.

Marking	Of wire mm	Length mrun	Width mrun	Mesh mm	Sheet weight kg	Weight m²
Q252	8	6,00	2,30	200x200	55,70	4,04
Q335	8	5,00	2,15	150x150	57,70	5,37
Q335	8	6,00	2,30	150x150	74,30	5,38
Q503	8	6,00	2,30	100x100	109,00	7,90
Q393	10	6,00	2,30	200x200	87,00	6,30
Q523	10	5,00	2,15	150x150	90,05	8,38
Q523	10	6,00	2,30	150x150	116,00	8,41
Q785	10	6,00	2,30	100x100	170,30	12,34
Q566	12	6,00	2,30	200x200	125,20	9,07
Q754	12	6,00	2,30	150x150	166,90	12,09
Q1131	12	6,00	2,30	100x100	245,10	17,76

Individual B500SP mesh can be manufactured based on the following boundary conditions.

Fi wire diameter 8; 10; 12 mm. steel grade: B500SP
Minimum mesh dimensions width: 500 mm, length: 1000 mm
Maximum mesh size width: 2500 mm, length: 12000 mm
Transverse eyelets, between longitudinal bars – 50 mm (eyelets every 50 mm)
Longitudinal eyelets, between transverse bars – 50 mm (eyelets every 1 mm)
Minimum projections – 25 mm
Maximum projections – 1100 mm
Maximum number of longitudinal bars – 49 pcs.
The highest wire diameter: - 12 mm
The smallest eyelets for fi 12: - 100 x 100 mm
Maximum weight of a single mesh sheet – 400 kg.

Number of cross bars:

fi 12 no more than: 121 pcs.
fi 8 to fi 10: 241 pcs.

Mesh design.

The CMC Poland Sp. z o.o. company has introduced the possibility of designing an individual, special or custom welded mesh on its website.

The mesh design system allows you to design standard and custom welded mesh. Using the system, you can easily make any grid design, in accordance with the boundary conditions, and make its valuation, if necessary. Each project can be saved, repeatedly returned to and downloaded as a PDF file to be printed along with the calculated weight and dimensions. Projects can be edited and new ones can be created. The system is a great tool for anyone who needs a welded mesh.

Individual and custom mesh for special orders.

The CMC Poland Sp. z o.o. company makes an effort to obtain the highest satisfaction of its customers.

In the welded mesh production process, the lines used have extremely efficient production flexibility.

Thanks to this, CMC Poland Sp. z o.o. can realize unique, individual orders for custom meshes ordered by customers.

A modern welding mesh production line enables the production of individual meshes while maintaining high efficiency. The unprecedented solutions on the market allow for the implementation of tasks that until today were impossible or very expensive.

At the company located in Dąbrowa Górnicza CMC Poland sp. z o.o. has modern lines for the production of welded mesh.

Production lines provide:

The fastest delivery times
The highest quality of manufactured products
The highest production flexibility
High performance
Individual approach to customer
The possibility of carrying out custom and individual orders
Meet all standards and technical requirements

The continuous process of development and improvement of production techniques enables continuous improvement of product quality and contributes to the improvement of the culture of steel products

Summary.

All the above information makes us aware that the welded mesh successfully displaces the classic reinforcement, accelerating the implementation of the investment, while reducing its costs.

The introduction of a new grade of B500SP mesh allows for a wider use of mesh in construction and in principle there are no places where such mesh could not be used.

In this way, new perspectives for the construction market are opening up, in particular for designers, constructors or builders.

More information is available at:

https://www.siatkizgrzewane.pl/

The information discussed above can be found at:

B500SP mesh - https://www.siatkizgrzewane.pl/siatki-goracowalcowane,a43

Mesh design application - https://www.siatkizgrzewane.pl/zaprojektuj-siatke

CMC company contact details - https://www.siatkizgrzewane.pl/kontakt

All queries regarding meshes can be sent to: siatki@cmc.com

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