W. NR. 1.2344 ESU


The chromium-molybdenum-vanadium-silicon steel is intended for oil quenching and air hardening. It has very good hardening capacity (the steel hardens over the whole cross-section to ca. 150 mm diameter), high hot strength and resistance to tempering and abrasion (higher than the 1.2343 steel), very good toughness and plastic properties at normal as well as high temperatures. The steel also shows very good resistance to cracks caused by thermal fatigue (lower than the 1.2343 steel) and higher sensitivity to abrupt temperature changes in comparison with the 1.2343 steel. The steel is suitable for heat treatment to strength exceeding 1765 N/mm2, and for water-cooled tools. It is thermoplastic and workable in soft-annealed condition.


The steel is suitable for hot-forming tools like small dies for forging presses, counter-dies, die inserts, upsetting tools, piercing tools, jaws, and punches. It is also suitable for the hot extrusion of light-alloy components and for tolls subjected to high stress, for instance, die-casting moulds for aluminium and zinc, fixed and moving parts that come into contact with liquid metal, inserts of functional parts of mandrels, inlet sockets, slide valves, distributors, etc. The steel can also be used for hot-shearing tools, small and medium-size shear blades, trimming dies, and punching dies.

Chemical composition of steel W.Nr. 1.2344ESU

Steel gradeChemical composition in %Hardness in the state
CMnSiCrWMoVNi maxCoP max.S max.HB max.HRC min.
DIN X40CrMoV510,37-0,430,30-0,500,90-1,204,80-5,50 1,20-1,500,90-1,10  0,0300,03022951
ČSN 19 5540,34-0440,20-0,500,80-1,204,80-5,80 1,10-1,600,80-1,20  0,0300,03025051

Heat treatment of steel W.Nr. 1.2344ESU

WayTemperature [°C]Procedure
Forging900-1100Cool down slowly in dry ash or other heat-insulating material; large cross-sections should be cooled in a furnace
Soft annealing750-800Heat up for several hours (according to the size of the object) – 4 hours are usually enough – and cool down slowly in a furnace
Annealing to lower tension600-650Heat up for 1–2 hours and cool down slowly in a furnace
Hardening1020-1070Smaller and simpler tools should be cooled down in oil to ca 100 °C and then removed to air
Larger and more complex tools should be cooled down in the open air or in a 500–550 °C oil bath
Tempering550-650Cool down in the open air, the degree of tempering is governed by the tool’s hardness and toughness in accordance with the tempering diagram


Chart of tempering values depending on the hardness:



Delivery goods

Round bars: D102 - 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 steel.

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