What is structural steel?
Structural steel is an unalloyed or low-alloy steel with good formability, weldability and strength. The designations S235 and S355 stand for two common strength classes that are frequently used in mechanical engineering, steel construction and in the manufacture of Rubber-metal composite parts can be used as a carrier material.
Properties of S235 and S355
The letter „S“ stands for „Structural Steel“, followed by the minimum yield strength in MPa:
- S235: minimum yield strength 235 MPa, good weldability, easy to machine, cost-effective
- S355: minimum yield strength 355 MPa, higher strength, also good weldability, suitable for load-bearing structures
Both variants are easy to process - by welding, cutting, bending or coating - and offer a good balance between cost, availability and technical performance. However, they are only moderately resistant to corrosion and require surface protection (e.g. galvanising, painting) depending on the environment in which they are used.
Application of structural steel
Structural steels such as S235 and S355 are used in many areas:
- Carrier materials in Rubber-metal composite parts (e.g. bearings, Damper, Sealing systems)
- Steel structures in mechanical and plant engineering
- Vehicle frames, brackets, reinforcements
- Construction projects such as halls, bridges, railings, frame constructions
The choice of material depends on the required load-bearing capacity, corrosion protection and environmental conditions.