W. NR. 1.2343 ESU


Chrome–molybdenum–silicon–vanadium steel for hardening in oil and in air with very good hardenability, high firmness during the heat and resistance to the tempering, very good toughness and plastic properties during normal and also higher temperatures. Further the steel has a very good resistance to tearing of thermal fatigue and low sensitivity to quick changes of temperature. The steel is suitable for the heat treatment also for hardness over 1800 N/mm2 and for tools cooled by water. It is well-workable during the heat and well-workable in the soft-annealed state.


For molds for firm and movable core parts and other parts of molds for pressure casting of aluminum alloys and large series of castings of zinc and magnesium alloys. Tools for hot mechanical working, i.e. very stressed small and middle-sized dies and inserts of dies. Dies, thorns, jaws and punches especially with the high firmness over 1800 N/mm2 cooled by water. Very stressed extruders and other auxiliary tools for extrusion of non-ferrous metals during the heat, extrusion dies for aluminum and its alloys. Tools for hot cutting, e.g. small or middle-sized shear blades, trimming dies and cutting thorns.

Chemical composition of steel W.Nr. 1.2343ESU

Steel gradeChemical composition in %Hardness in the sta
CMnSiCrWMoVNi maxCoP max.S max.HB max.HRC min.
DIN X38CrMoV510,36-0,420,30-0,500,90-1,204,80-5,50 1,10-1,400,25-0,50  0,0300,03022950
ČSN 19 5520,32-0,420,20-0,500,80-1,204,50-5,50 1,10-1,600,35-0,60  0,0300,03024050

Heat treatment of steel W.Nr. 1.2343ESU

WayTemperature [°C]Procedure
Forging850-1110Cool slowly in dry ash or thick cross-sections in the furnace
Soft annealing760-780Warm few hours (according to the size of object), mostly four hours are enough and cool slowly in the furnace
Annealing to lower tension600-650Warm 1 to 2 hours and cool slowly in the furnace
Hardening in oil or in air1000-1030Cool smaller and simpler tools in oil up to about 100 °C, it is more appropriate to cool bigger and more rugged tools in air
Tempering550-650Cool in air, the degree of tempering is set by hardness and toughness of instrument according to the tempering chart


Chart of tempering values depending on the hardness:


Product range

Round bars: D41 - D605
Blocks: 410x1010, 510x910
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.

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.

Tool steel meets the requirements of various kinds of tools, e.g. for machining, hot- and cold-working, measuring instruments and die-casting moulds. These tool materials conform to great quality demands of steel, like temper, strength, toughness, resistance to tempering, hardening capacity, dimensional stability, etc. The range of tool steel in our store includes products from renowned manufacturers. We also supply 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 steelbest watch replica.

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