W. NR. 1.2379


Chrome-molybdenum-vanadium steel with big hardenability for hardening in oil and in air, especially high resistance to the wear (higher than by 1.2080), good cutting power, very good firmness in the pressure, lower toughness (but higher than by 1.2080). This steel shows good dimensional stability at the heat treatment, suitable for hardening to the secondary hardness (the possibility of nitriding). Further the steel is very difficult to sharpen, it works at the heat with difficulties and has a rather difficult workability in the annealed state.


Tools for cold cutting, i.e. all kinds of tools with the long durability for cutting on presses and punching of materials of smaller thicknesses and materials of high hardness (especially difficult-shape tools for cutting, e.g. transformer metal sheets and metal sheets from stainless steels), knives for plate shears for the sheet and strip steel up to thickness of 10 mm of sheared material, knives for wire cutting etc. Tools for mechanical working such as e.g. smaller girders and tools for drawing, all kinds of tools for transformation and punching of materials. Further the steel is suitable for simple and symmetric tools for pressing and pushing, tools for thread rolling, plain and profile rolls, swages and also for cold work. Cutting tools such as broaching thorns, profile knives and difficult-shape milling machines for lower cutting speeds and for treatment of nonmetallic abrasive materials. Further the steel is applied in the production of highly stressed molds and their components for working of plastic and powder substances, glass, porcelain and ceramic materials. By tools for crushing and grinding it is used for hammers of crushers and jaws for mild grinding and crushing.

Chemical composition of steel W.Nr. 1.2379

Steel gradeChemical composition in %Hardness in the state
CMnSiCrWMoVNi maxCoP max.S max.HB max.HRC min.
DIN X155CrVMo1211,50-1,600,15-0,450,10-0,4011,0-12,0 0,60-0,800,90-1,10  0,0300,03025559
ČSN 19 5731,40-1,600,20-0,450,20-0,4511,0-12,5 0,60-0,950,80-1,20  0,0300,03525063

Heat treatment of steel W.Nr. 1.2379

WayTemperature [°C]Procedure
Forging850-1050Cool slowly in calm air or better e.g. in dry ash or other thermally-insulated material
Soft annealing830-860Warm few hours (according to the size of object), mostly four hours are enough and cool slowly in oven
Annealing to lower tension600-650Warm 1 to 2 hours and cool slowly in the furnace
Hardening1000-1080Cool in oil, air or salt bath at the temperature of about 500-550°C
Tempering100-550Cool in air, the degree of tempering is set by hardness and toughness of instrument according to the tempering chart


  • Hardening temperature 1000-1050 °C

Chart of tempering values depending on the hardness:




  • Hardening temperature 1050-1080 °C, tempered 3 times

Chart of tempering values depending of the hardness:



Product range

Round bars: D10 - D603
Blocks: 455x605, 305x805
Flat bars: from 10x605 to 255x605
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