Schrag Polska - Cold-formed sections

We operate throughout Europe



Schrag, we have been working for you since 1892

We are a company with over 125 years of experience in steel processing and cold bending of sections.

We have 16 branches across Europe and employ over 450 people.

We invite you to familiarize yourself with our offer of sections for the production of container frames, in addition, our production also includes cold-formed sections, roof purlins (Z-profiles, Z-sections) and wall transoms (C-profiles, U-sections), flashings, steel façades, aluminium façades, bases for continuous skylights, photovoltaic constructions.


We have been manufacturing cold-formed sections since the 1960s. Currently, they constitute the main scope of our production. We have a fully computerized machine park that allows us to obtain very high dimensional accuracy and repeatability of sections.



Our experience

Our experience

Our experience in steel processing dates back to 1892


Our know-how

It has been acquired and passed down for several generations

Technical support

Our advisors

They are at your disposal 5 days a week



Over the last 10 years, the production of container frames has changed a lot. In the past, they were mainly welded from closed metallurgical profiles. It is a simple and proven solution, however, it creates significant limitations in the subsequent stages of the production of the entire container. First of all, the profiles are available in commercial lengths set by steelworks, have limited cross-sectional dimensions, cannot be protected from the inside, which accelerates corrosion, and have a large weight, which directly translates into the cost of the entire container.

An alternative solution offered by Schrag Polska are steel container profiles manufactured in the form of cold-formed sections. The starting material is a flat steel sheet with appropriate strength parameters, thickness and grade.

The advantages of cold-formed container profiles:

  • manufactured individually, tailored to each order
  • great freedom of shape of the cross-section
  • variable sheet metal thickness and grade
  • element lengths tailored individually to each project
  • low weight of profiles
  • relatively low price

Depending on the thickness of the sheets and the shape and dimensions of the cross-section, we manufacture sections using two technologies:

  • edge bending
  • continuous profiling

The edge bending technology is more versatile. It allows for more complex cross-sectional shapes and covers a wider range of sheet thicknesses. However, it is more time-consuming than continuous profiling technology and requires more effort. Compared to continuous profiling, it is much more versatile, more shapes can be made. Starting from roof purlins (Z-profiles, Z-sections), wall transoms (C-profiles, U-sections) through flashings, steel façades, aluminium façades, steel container profiles, substructures for photovoltaic systems and bases for continuous skylights.

Continuous profiling technology is less time consuming. Thanks to it, sections can be produced in a much shorter time compared to edge bending. The advantage of this method is the possibility to obtain longer lengths of elements, but it is associated with large limitations of shapes and dimensions of the cross-section. This technology is most often used to manufacture roof purlins (Z-profiles, Z-sections), wall transoms (C-profiles, C-sections), 2x bent C-profiles (also as container profiles).

In addition, we drill holes, make undercuts and bevels in the sections we manufacture. We manufacture sections to specific orders based on the documentation provided by the customer. The elements are individually adapted to each project.

drilling holes in profiles

making undercuts and bevels

special hole drilling

Sheet metal grades and thicknesses

The most commonly used steel grade is: S235 and S355, moreover, container profiles can also be made of DX51D, S350GD or S390GD galvanized steel sheets.

The thickness of the sheets used ranges from 1.0 to 4.0 mm.



Schrag Polska - cold-formed sections

Upper beam

upper beam bent 6x

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upper beam - circumferential gutter

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upper beam bent 5x

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More about cold-formed sections at

One of the characteristic and most frequently produced cold-formed container profiles is the upper beam (circumferential gutter). It is the most complex element of the entire frame due to its cross-sectional shape. It serves as both a load-bearing element of the container frame and an additional perimeter gutter that collects and drains water from the roof. This solution greatly facilitates and speeds up the construction of the container. Making the perimeter gutter as a single element welded only in the corners ensures its tightness and functionality. The use of cold-formed open sections as container profiles also has a positive effect on the possibility to protect steel against corrosion. After welding and processing, the container frame can be easily protected, e.g. by cleaning all easily accessible surfaces and then applying protective paint coats. The perimeter gutter is most often made of “black” sheet metal. If you want to obtain additional anti-corrosion protection, it can be made of galvanized steel sheets.


Lower beam

bottom beam bent 3x

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lower beam bent 2x

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lower beam bent 5x

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Another cold-formed container profile is the lower perimeter beam. It mainly performs the load-bearing function for the entire container. At the customer’s request, we can also make undercuts and bevels that facilitate the assembly of subsequent elements, e.g. transverse stiffening ribs or electrical, or water and sewage systems. It does not have such complicated shapes as the upper gutter, but due to the open shape of the cross-section, it is also easy to process and protect with protective paint coats. It is most often made of “black” sheet metal, but it can also be made of galvanized steel sheets for additional anti-corrosion protection.





25,000 TONS





upright bent 5x

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upright bent 3x

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upright bent 5x

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The uprights complete the entire container frame. Most often, they are made of 4.0 mm thick sheet metal with properly made end bends adjusted to the thickness of the sandwich panel that covers the walls of the container. In addition, special transport holes with a rolled edge are made at the ends to facilitate lifting and transport of the container. Similarly to the upper gutter and the lower beam, the uprights are made as cold-formed open profiles. This is a great facilitation during their processing, welding, cleaning and protection with protective coats. They can also be made of galvanized steel sheets to improve their corrosion resistance.

Reinforcing crossbars


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The last element of the container frame are reinforcing crossbars. Our solution is also based on cold-formed sections. They can have different cross-sectional shapes, depending on the type and purpose of the container. Most often, these are C- or Ω-profiles made of “black” sheet metal with a thickness of 2.0 mm to 4.0 mm. The crossbars are welded to the lower beam and then protected against corrosion with paint coats. Due to the open shape of the cross-section, it is possible to protect the entire surface.

Transport holes

upright bent 5x

upright bent 5x

upright bent 5x

An important element of the container frame are also special oval transport holes with a rolled edge. The fold strengthens the edge of the hole and prevents tearing of the sheet when lifting the container. The holes are usually made at the ends of the uprights.

Hole dimensions 50 x 75mm.

The solution we propose is not only functional and practical, but also very aesthetic. In addition, it reduces the cost of building the container because there is no need to use additional elements, the so-called “container corners (cubes)” in the corners of the container


Roof sheathing

flat sheet sheathing

container roof sheathing

sheathing with trapezoidal sheet

The culmination of the entire structure is the roof sheathing of the container. They can be made in different ways. Our proposal is based on cold-formed sections. We present two solutions:

  • flat sheet metal sheathing with standing seam connection
  • trapezoidal sheeting

Flat sheet sheathing is most often made of 1.0 mm thick galvanized sheet metal. It is a simple, effective and economical solution, moreover, the zinc coating is also a protection against corrosion.

The second type of sheathing with trapezoidal sheet is made of “black” steel sheet due to the subsequent welding of individual elements. The most commonly used sheet is 1.5 mm thick. After processing, the entire surface of the sheet metal is protected with protective paint coats.



flat coffers


corner façade coffers

Containers can have different purposes. Starting from typical transport, through social, office, residential, specialist, construction, sanitary and storage. In addition to functionality, containers must also meet the aesthetic requirements of users. It is true in particular in case of office or residential containers. To meet the expectations, we offer solutions utilizing cold-formed sections: coffers, façade panels and flashings. The most commonly used façade elements are corner façade coffers. In addition, coffers and flat panels can also be used, e.g. on the front side of the container. Façade coffers and panels are most often made of galvanized steel sheet, which is additionally coated with coats in colours from the RAL palette. In addition, they can also be made of aluminium sheet. Another option is to make them from “raw” steel or aluminium sheet and then apply protective coats in the powder coating technology. Due to the application of the coating after the coffer is made, all surfaces are protected, including the edges of cuts and holes. The façade also includes a substructure to which coffers and panels are attached. The selection and shape of individual profiles depends on the construction of the container. Our proposal is based on cold-formed sections. The starting material is galvanized steel or aluminium sheet. Depending on the method of fixing the coffers and panels, cold-formed substructure profiles can also be additionally protected with protective paint coats, most often by powder coating. The substructure profiles most often have an Ω-shaped cross-section, and can also be C- or Z-shaped.
More about façades at
The cross-sections given above show only exemplary production capabilities of Schrag Polska.
Schrag is not responsible for the correct selection of individual elements, both in terms of assembly and statics.


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