W. NR. 1.2550

Characteristics

Chrome–tungsten–silicon–vanadium steel for cold work for hardening in oil with the middle hardenability (steel is hardened up to diameter of 60 mm during the hardening in oil), very high toughness, resistance to the dynamic stress, shocks and hits, good resistance to the wear and dimensional stability at the heat treatment.

Suitability

Tools for cold cutting, i.e. shear blades, tools for cold cutting and punching of materials of thicker thicknesses (up to about 15 mm) and higher hardness, profile and industrial knives, scrapping scissors, circular scissors. Tools for mechanical working such as tools for punching of simple as well as difficult shapes, tools for pushing and extrusion at lower pressures, marking dies, hammers, crusher for rougher crushing. Hand tools, i.e. pneumatic and hand chisels, marking dies for cold and also hot work.

Chemical composition of steel W.Nr. 1.2550

Steel gradeChemical composition in %Hardness in the state
soft-annealedheat-treated
CMnSiCrWMoVNi maxCoP max.S max.HB max.HRC min.
DIN 60WCrV70,55-0,650,15-0,450,50-0,700,90-1,201,80-2,10 0,10-0,20  0,0300,03022957
ČSN 19 7350,55-0,650,15-0,400,45-0,751,00-1,301,80-2,30 0,10-0,250,25 0,0300,03522560

Heat treatment of steel W.Nr. 1.2550

WayTemperature [°C]Procedure
Forging850-1100Cool slowly in calm air or better e.g. in dry ash or other thermally-insulated material
Soft annealing710-750Warm few hours (according to the size of object), mostly four hours are enough and cool slowly in the furnace
790-820For getting the minimum hardness and making the process faster, the temperature delay for about 2 hours and then slow cooling in the furnace from 50 °C/hour up to 500 °C
Annealing to lower tension600-650Warm 1 to 2 hours and cool slowly in the furnace
Hardening in oil870-900Oil or hot bath 180-220 °C
Tempering180-400Cool 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:

°C100200300400500600
HRC605856524843

Graph

Product range

Round bars: D20,5 - D200
Blocks: 360x660
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