Steel К76 products
Steel grade K76 characteristics
Steel grade K76 – steel for the production of railway rails that meets the requirements of DSTU 4344 and GOST R 51685.
Classification: Rail steel.
Products: Wide-gauge railway rails of the P75, P65, P50, P65K type, rails for other purposes.
Chemical composition of steel grade K76 (ladle analysis) according to the requirements of DSTU 4344, %
| С | Si | Mn | Al | S | P |
| 0.71 - 0.82 | 0.25 - 0.45 | 0.80 - 1.30 | ≤ 0.025 | ≤0.040 | ≤ 0.035 |
Mechanical properties of rails from steel grade K76 according to the requirements of DSTU 4344
| Rail category | Tensile strength, N/mm2 (min) | Yield strength, N/mm2 (min) | Elongation, % (min) | Reduction of area, % (min) | Impact strength KCU, J/cm2 (min) |
| Highest | 1290 | 850 | 10.0 | 30.0 | 15 |
| I | 1196 | 800 | 8.0 | 25.0 | 25 |
| II | 1137 | 740 | 6.0 | 25.0 | 15 |
| III | 900 | - | 5.0 | - | - |
Application
Steel grade K76 is used in the production of railway rails of the P75, P65, P50 type and other steel rail products.
Welding
Due to its high carbon content, steel K76 belongs to the class of hard-to-weld steels. Therefore, only some types of welding can be used to bond rails – aluminothermal welding, oxyacetylene pressure welding, electrocontact welding, and electric arc welding.
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