Forma Maschinenbau Logo
Request Project
Materials
/
Steel
S235 / S355

Structural Steel

The standard material in steel construction and mechanical engineering: excellent weldability, good machinability, and cost-effective – from S235 to S355.

Request component
Suitable machines
PropertiesChallengeMachiningMachinesIndustriesFAQ

Brief definition

Structural Steel

Non-alloy structural steels such as S235, S275, and S355 are the most commonly used construction materials in steel and mechanical engineering. They offer good weldability and machinability and are economically available. The challenges lie less in the material itself than in the size of the components, distortion after welding, and tight tolerances over long lengths.
S235JR
S275J2
S355J2+N
St37 / St52 (former designation)
Properties
Density

7.85 g/cm³

as with all steel grades

Tensile strength

360–630 MPa

S235 to S355, depending on the grade

Weldability

Good

Standard processes

Machinability

Good

Stable cutting data

Machining

Challenge and solution

  • Challenge

    Distortion after welding

    Welding stresses deform large assemblies and shift dimensions.

    Our Solution

    Machining allowance and finish machining

    We incorporate machining allowances and completely finish-machine the assembly after welding.

  • Challenge

    Dimensional accuracy over long lengths

    Deviations accumulate in large components.

    Our Solution

    In-house measurement

    Gantry CMMs and laser trackers inspect even large components without the need for external service providers.
Machining

How we machine this material

We machine structural steel using documented cutting data and stable clamping concepts. For welded structures, we plan the machining allowance and processing sequence to ensure that welding distortion is compensated for during finish machining.

  • Documented cutting data
  • Finish machining after welding
  • Components up to 24 m in length and 160 t

Manufacturing

Suitable processes

CNC Milling

CNC milling at FORMA Maschinenbau: Milled parts up to 24 m length, 5-axis simultaneous machining, and 5-axis milling for single parts and series from the Münsterland region.
  • Up to 24,000 mm component length
  • 5-axis simultaneous
  • More About This Service

Machine allocation

Approved Structural Steel for

Soraluce

Soraluce FX24000

Component length
24,000 mm
Axes
5 axes
Size Class
Over 10 m
Technical Data →

Applications

Where Structural Steel it is used

For us, quality is not just a word, but measurable reality. Through state-of-the-art testing equipment such as laser interferometers and 3D measurement technology, we ensure that every component precisely meets specifications.

Construction machinery

Construction Machinery

Large Components, Structural Steelwork

Mining

Wear-Resistant Large Components

Frequently asked questions

FAQ Structural Steel

Which structural steels do you process?

All common grades, such as S235, S275, and S355 in the standard quality groups. Other grades are reviewed on a case-by-case basis.

Can you perform both welding and machining?

Yes. We manufacture structural steel welded structures at our own welding stations and then process them on our gantry and traveling column milling machines.

Do you provide material certificates?

Yes. Upon request, we provide material certificates and inspection reports with batch allocation.

Inquiry

Request a component made of this material

Please specify the alloy, wall thicknesses, and tolerances. We provide realistic estimates for machining time and tooling costs.
Inquire about material
+49 2862 58787-0

Your contact person

Norbert Groß-Onnebrink

Executive Management
This site is registered on wpml.org as a development site. Switch to a production site key to remove this banner.