INVESTIGATION OF THE DEPTH OF THE DECARBONIZED LAYER ALONG THE PERIMETER OF THE P65 RAIL PROFILE
https://doi.org/10.57070/2304-4497-2026-2(56)-115-120
Abstract
A metallographic study of the depth distribution of the visible decarbonized layer along the perimeter of R65 railway rails made from continuously cast billets with a cross section of 300 × 360 mm made of 76XF steel on a universal rail rolling mill has been carried out. It was found that the depth of the visible decarbonized layer along the perimeter of the rail profile is unevenly distributed, is in the range of 45 ‒ 184 microns and actually varies by 6 times. In the area of the rolling surface of the rail head, the depth of the decarbonized layer is only 170 microns. The lowest depth of the decarbonized layer is typical for the cutouts connecting the sole and neck of the rail profile (sections 12 and 24). The maximum depth of the decarbonized layer of 184 microns corresponds to the area 20 located in the area of the feathers of the sole of the rail profile. A comparative analysis of the data obtained with the results of previously performed work for rails obtained from continuously cast billets (steel grade E76F) shows that significant progress has been made in reducing the visible decarbonized layer in rail products of the West Siberian Metallurgical Combine branch of PJSC EVRAZ. The technical re-equipment of the enterprise ensured a reduction in the maximum depth of the visible decarbonized layer along the cross-section of the rail profile from 1000 to 184 microns, while its arithmetic mean value according to the results of measurements at 32 points along the perimeter of the profile was reduced from 346 to 123 microns, that is, 2.8 times. The unevenness of the depth distribution of the decarbonized layer was reduced from 33 to 6 (5.5 times).
About the Authors
Aleksandr V. Pimakhin
Siberian State Industrial University
Russian Federation
Russian Federation
leading specialist in additional professional education at the Center for Additional Professional Education
Egor V. Polevoy
Branch of the West Siberian Metallurgical Combine of PJSC EVRAZ
Head of the Scientific Research Center
Elena N. Temlyantseva
Siberian State Industrial University
Cand. Sci. (Eng.), Assist. Prof., Acting Head of the Chair “Thermal Power and Ecology”
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Review
For citations:
Pimakhin A., Polevoy E., Temlyantseva E. INVESTIGATION OF THE DEPTH OF THE DECARBONIZED LAYER ALONG THE PERIMETER OF THE P65 RAIL PROFILE. Bulletin of the Siberian State Industrial University. 2026;(2):115-120. (In Russ.) https://doi.org/10.57070/2304-4497-2026-2(56)-115-120
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