FIELD: metallurgy.
SUBSTANCE: prior to cooling of rolled rail at the finishing temperature of rolling of 850-870°C, rail ends are clamped in clip-on chucks and stretched in lengthwise direction at strain making 0.7-0.9 of yield point of rail steel at the finishing temperature of rolling.
EFFECT: levelled strain in cross-sections over rolled rail length, decreased flexure and buckling of hardened rails.
3 dwg
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