ČSN 11 523 / 1.0570 / ST52.3


Unalloyed structural fine-grained steel appropriate for welding.


Bridge and other welded constructions, bent profiles, welded constructions from hollow profiles and parts of machines, cars, motorcycles and bicycles. Parts of thermal energy facilities and parts of pressure containers made from bars.

Chemical composition of steel ČSN 11 523

Steel gradeChemical composition in %Hardness in the state
CMnSiCrWMoVNi maxCoP max.S max.HB max.HRC min.
DIN není             
ČSN 11 523max 0,20max 1,60max 0,55      0,0400,045  

Heat treatment of steel ČSN 11 523

WayTemperature [°C]Procedure
Normaliziation870-900Cool in air, big cross-sections faster
Soft annealing680-710Cool slowly
Tempering670-700Cool in air


  • Kind of steel according to the way of production – killed fine-grained
  • Coloured marking according to ČSN 42 0010 – black/green
  • Class of waste according to ČSN 42 0300 - 001 

Delivered goods

Round bars: D10 - D615
Blocks: 510x1600
Metal plates: s.8 - s.200
We will deliver any semi-finished products from the above mentioned dimensions. Other dimensions, except for given stock supplies, have to be consulted with us.

We supply these grades of steel: St52.3, C45, 16MnCr5, 42CrMo4

Tool steel meets the requirements of various kinds of tools, e.g. for machining, hot- and cold-working, measuring instruments and die-casting moulds. We also offer high-speed steel.

Special tool steel is suitable for the manufacture of moulds, dies and pressing tools. This steel have better end-use properties than common classic steel, therefore it can help saving considerable amounts of money in manufacture.

This patented Swedish steel is distinguished by its high range of use. It is suitable for the manufacture of tools and moulds as well as machinery parts. This material can replace many kinds of classic tool and structural steel.