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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2008

1 Pacyna J.

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The microstructure and properties of the new bainitic rail steels

100%

Pacyna J.

2008

tom Vol. 28, nr 1

19-22

Purpose: The aim of this research was presentation of the Continuous Cooling Transformations (CCT) diagrams and mechanical properties of two new bainite rail steels with working names RB370 and RB390. Design/methodology/approach: The CCT duiagrams was prepared by dilatometric method. The mechanical properities (Rp0,2, Rm, A, Z, KV, KU2, KIc and KIc-20) was searched according to European Standards. Findings: It was found, that on the whole cross-section of rails (S49 or UIC60) made of this new steels only bainite (mainly low bainite) will be formed. Practical implications: Very high mechanical properties of new grades encouraged to implement the first one (nickel-free with hardness of 370 HBW) on commercial scale. Rails (S49) made of it are successfully operating as part of main exit track from Arcelor Mittal Steel Plant of Poland in Dąbrowa Górnicza since 2004 year. Originality/value: Orginal value of the paper is to give an information, that it is possibility to procedure bainite rails S49 or UIC60 types of a very high mechanical properties, directly in rolling mill.