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The aim of the present research project was to identify steel compositions and process conditions for in line head hardened rails, able to develop a uniform fine grained pearlitic microstructure with small interlamellar spacing, characterized by ultimate tensile strength values up to 1250 MPa and good ductility. The chemical composition and the flash welding process of hardened rails also needed to be optimized in order to prevent the softening of the heat affected zone (HAZ). The effects of chemical composition (C, Mn, Si, Cr, Nb, V, Ti) and main parameters of hot rolling and accelerated cooling on the microstructure and mechanical properties of pearlitic steels were reviewed. The influence of hot rolling variables on the austenitic grain size of steel rails was evaluated by laboratory tests using a quench-deformation dilatometer and by industrial trials run at Piombino's rail mill.

Additional information

Authors: ANELLI E, Centro sviluppo materiali, Roma (IT)
Bibliographic Reference: EUR 17873 IT (1998) 80pp., FS, ECU 13.50
Availability: Available from the (2)
ISBN: ISBN 92-828-2346-6
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