W. NR. 1.2581

Characteristics

Tungsten-chrome–vanadium steel for hardening in oil and possibly in air with very good hardenability, very high firmness during the heat and resistance to the tempering, high resistance to the hot tempering and good toughness. Further the steel has a lower resistance to tearing of thermal fatigue and higher sensitivity to quick changes of temperature. The steel is not appropriate for tools cooled by water. It is well-workable during the heat and well-workable in the soft-annealed state.

Suitability

For tools for hot mechanical working such as highly stressed small pressing dies and die inserts especially for die forging of accurate products from the difficult-workable steels and copper alloys, thorns and jaws for forging presses, forgings for swaging, tools for production of rivets, nuts and screws, small extrusion dies (matrixes), thorns, pressing discs for extrusion of alloys of non-ferrous metals. Further the firm and movable parts of molds, core and other small and highly stressed parts of molds for pressure casting of copper alloys can be made from the steel. Tools for hot cutting such as highly stressed small shear blades, punching dies, small trimming dies.

Chemical composition of steel W.Nr. 1.2581

Steel gradeChemical composition in %Hardness in the state
soft-annealedheat-treated
CMnSiCrWMoVNi maxCoP max.S max.HB max.HRC min.
DIN X30WCrV930,25-0,350,20-0,400,15-0,302,50-2,808,00-9,00 0,30-0,40  0,0350,03525052
ČSN 19 7210,25-0,350,20-0,500,15-0,452,10-2,608,50-10,00 0,15-0,30  0,0300,03024047

Heat treatment of steel W.Nr. 1.2581

WayTemperature [°C]Procedure
Forging900-1150Cool slowly in air or better in dry ash or in other thermally-insulated material
Soft annealing750-800Warm 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
Hardening1100-1150Cool in oil to the temperature of about 100 °C
1120-1170Cool bigger and difficult-shape tools in air or in thermal bath at the temperature of 500 – 550 °C
Tempering550-650Cool in air, the degree of tempering is set by hardness and toughness of instrument according to the tempering chart

Note

Chart of tempering values depending on the hardness:

°C100200300400500550600650700
HRC525150505152514837
N/mm2179017301690167017301790173015701170

Graph

Product range

Round bars: D20 - D100
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 has 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