ČSN 12 050 / 1.1191 / C45


Carbon steel for heat treatment and surface hardening.


Suitable for shafts of mining machines, turbo-compressors, carousels and so on. For bigger cogwheels, screws, gear rings, rotors of screw compressors, connecting rods, piston rods, spindles, plungers, pistons of compressors, pegs, screws, transport rollers, clutch disks, rollers, sockets, levers, stops, pins, connecting components, shunting forks, holders, carriers of satellites, beams, pawls, forged bolts of pressure containers, boring rods and cutter arbors.

Chemical composition of steel ČSN 12 050

Steel gradeChemical composition in %Hardness in the state
Soft annealedHeat-treated
CMnSiCrWMoVNi maxCoP max.S max.HB max.HRC min.
DIN is not             
ČSN 12 0500,42-0,500,50-0,80max 0,40max 0,40 max 0,10  0,400,0450,045     208 

Heat treatment of steel ČSN 12 050

WayTemperature [°C]Procedure
Normalization840-870Cool in air
Hardening830-860Cool in oil
800-830Cool in water
Soft annealing680-720Cool in furnace
Tempering530-670Cool in air


  • Kind of steel according to the way of production – hearth, electric steel or oxygen convertor - killed
  • Coloured marking according to ČSN 42 0010 - green/red/black
  • Class of waste according to ČSN 42 0030 - 002 

Delivered goods

Round bars: D10 - D615
Blocks: 510x1600
Metal plates: s. 10 - s. 400
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.