Background Art The materials, which were known and used by now for production of railway and tram point crossing frog castings are for example materials used under trade name 13 Mn super special, including iron with weight % of 0,60 up to 0,90% of carbon, 12,5 up to 16,5% of manganese, maximally 0,60% of silicon, maximally 0,05% of phosphor, maximally 0,03% of sulphur, 1,8 up to 2,2% of molybdenum, crossing frog rail steel used under trade name UIC 900A, including iron with weight % of 0,60 up to 0,80% of carbon, 0,1 up to 0,5% of manganese, 0,80 up to 1,3% of silicon, maximally 0,04% of phosphor, maximally 0,04% of sulphur, steel used under trade name 75-CSD VK, including iron with weight % of 0,45 up to 0,65% of carbon, 0,75 up to 1,45% of manganese, 0,10 up to 0,50% of silicon, maximally 0,050% of phosphor, maximally 0,050% of sulphur, steel used under trade name 85 and 95 CSD VK, including iron with weight % of 0,60 up to 0,80% of carbon, 0,75 up to 1,40% of manganese, 0,10 up to 0,50% of silicon, maximally 0,04% of phosphor, maximally 0,04% of sulphur, while the data in % represent the maximally approved range of concentration of individual elements or their maximal approved contents.

The disadvantages of steel with the 13 Mn super special quality include difficult machining, welding and facing of worn parts, impossibility of fault checking by ultra-sound. The disadvantages of the crossing frog rails in quality UIC 900A, 75 CSD VK, 85 and 95 CSD VK include low yield point, fast wearing and development of bars, low impact value, susceptibility to fraction, low hardness and operation life.

Disclosure of Invention The above stated disadvantages of materials especially for production of railway and tram point crossing frog are significantly eliminated by steel, characterised by including iron with weight % of 0,07 up to 0,15% of carbon, 0,50 up to 1,20% of manganese, maximally 0,50% of silicon, 1,20 up to 2,00% of chrome, 0,40 up to 0,70% of molybdenum, 2,50 up to 3,50% of nickel, maximally 0,13% of vanadium, maximally 0,05 % of titan, maximally 0,045% of the total contents of aluminium in steel, maximally 0,015% of phosphor, maximally 0,015% of sulphur.

The advantages of the steel in comparison with the actual technical situation include reaching of improved mechanical characteristics, where the strength limit Rm is 950 MPa up to 1300 MPa, the yield limit RpO, 2 is minimally 750 MPa up to 915 MPa, impact value KCV is minimally 20 J/cm2, hardness 290 HB up to 420 HB and ductility minimally 10%.

Description The sample of the technical solution according to the utility model includes steel, which includes iron with weight % of 0,140% of carbon, 0,80% of manganese, 0,34% of silicon, 1,76% of chrome, 0,471% of molybdenum, 2,63% of nickel, 0,087% of vanadium, 0,045 % of titan, maximally 0,042% of the total contents of aluminium in steel, maximally 0,014% of phosphor, 0,009% of sulphur.

This steel is characterised by the final strength limit (Rm) of 1147 MPa, the yield limit (Rp0, 2) 915 MPa, the impact value (KCV+20°) 26 J/cm2, hardness 338 HB, ductility (A5) 14,8%.

Industrial Applicability The technical solution can be advantageously used for railway and tram point crossing frog castings with high requirements on resistance against wearing. The steel is highly strenuous, it allow good-quality welding and machining of the crossing frogs.