An experimental batch of R50 low-alloy 378XCΦ steel rails is produced. Alloying with chromium (0.55%) yields an anomalous combination of strength, plasticity, and impact strength. The microstruc-ture of the metal consists of colonies of fine-grain predominately sorbite-like pearlite. If the content of non-metallic inclusions in the steel is sufficiently low, this extends the working life of the subway rails.
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