Abstract: Apparatus for cooling at least two bars travelling in parallel linear paths after having been formed from a larger bar in a rolling mill, comprises a common antechamber for receiving the bars, a cooling water inlet and a cooling water outlet communicating with the antechamber, first and second common nozzle chambers, the first nozzle chamber being arranged for receiving the bars from the antechamber and the second nozzle chamber being arranged for receiving the bars from the first nozzle chamber, each of the nozzle chambers being provided with a respective cooling water inlet communicating with the respective nozzle chamber through a respective equalizing chamber, each of the nozzle chambers containing for each of the bars a respective funnel for guiding the bar and a nozzle for receiving the bar from the funnel, the nozzle having passages for conducting water from the chamber into contact with the bar, communicating with each of the nozzles a respective heat exchanger pipe for receiving a respective one of t

Abstract: The straightness of rolled steel is improved by controlled cooling with water under pressure which, depending on the composition of the steel, accelerates or retards the .gamma./.alpha.-conversion and prevents the rolling stock, while on the cooling bed, from being warped or increased in length by the conversion.