The invention relates to a device for water spray quenching that includes (i) a quenching chamber designed and set up to receive metallic workpieces, with a batch of volume V.sub.0 of 0.045 to 3.5 m.sup.3 and (ii) at least one atomizer which is configured to atomize water in air or nitrogen and is fluidically connected to the quenching chamber; in which the at least one atomizer and the device are designed and set up to generate a spray mist with a water content of 2.5 to 40 vol. % and a Sauter mean diameter of 20 to 2000 m and also a spray mist flow through the batch volume V.sub.0 of 0.05 to 25 m.sup.3/s.

The invention relates to a device for water spray quenching that includes (i) a quenching chamber designed and set up to receive metallic workpieces, with a batch of volume V.sub.0 of 0.045 to 3.5 m.sup.3 and (ii) at least one atomizer which is configured to atomize water in air or nitrogen and is fluidically connected to the quenching chamber; in which the at least one atomizer and the device are designed and set up to generate a spray mist with a water content of 2.5 to 40 vol. % and a Sauter mean diameter of 20 to 2000 m and also a spray mist flow through the batch volume V.sub.0 of 0.05 to 25 m.sup.3/s.

A method for producing a hot-dip galvanized steel sheet includes supplying humidified gas to the soaking zone 12 in a manner such that: in passes in which the steel sheet moves upward, the humidified gas is supplied from first humidified gas supply ports 40A to 40E provided at positions higher by 1.0 m or more and 5.0 m or less than the centers of lower hearth rolls 54 and overlapping the steel sheet in the passes when viewed from the side of the soaking zone; and in passes in which the steel sheet moves downward, the humidified gas is supplied from second humidified gas supply ports 42A to 42E provided at positions lower by 1.0 m or more and 5.0 m or less than the centers of the upper hearth rolls 52 and overlapping the steel sheet in the passes when viewed from the side of the soaking zone.

A tempering station for the partial heat treatment of a metal component, which includes an apparatus for the heat treatment of a metal component, and the use of at least one tangential nozzle in a tempering station for the partial heat treatment of a metal component. The tempering station for partial heat treatment of the metallic component comprises a processing plane disposed in the tempering station, the component being able to be disposed in said plane, and at least one nozzle which points to the processing plane and is provided and adapted for discharging a fluid stream for cooling at least a first sub-area of the component, wherein the at least one nozzle is a tangential nozzle. The tempering station and the apparatus make it possible in particular to adjust, as reliably and/or precisely as possible, a transition region between the different heat-treated sub-areas of the component, in particular to keep said region as small as possible.

A tempering station for the partial heat treatment of a metal component, which includes an apparatus for the heat treatment of a metal component, and the use of at least one tangential nozzle in a tempering station for the partial heat treatment of a metal component. The tempering station for partial heat treatment of the metallic component comprises a processing plane disposed in the tempering station, the component being able to be disposed in said plane, and at least one nozzle which points to the processing plane and is provided and adapted for discharging a fluid stream for cooling at least a first sub-area of the component, wherein the at least one nozzle is a tangential nozzle. The tempering station and the apparatus make it possible in particular to adjust, as reliably and/or precisely as possible, a transition region between the different heat-treated sub-areas of the component, in particular to keep said region as small as possible.

A machining apparatus includes: a support mechanism that supports a workpiece; a cutting mechanism that cuts the workpiece that has been supported by the support mechanism; and a heat treatment mechanism that performs heat treatment on the workpiece that has been supported by the support mechanism. The heat treatment mechanism includes a coil that performs induction heating on the workpiece. The coil and the workpiece that has been supported by the support mechanism are movable relative to each other.

Apparatus for the thermal treatment of a component, which can be arranged in a component plane (E) in the apparatus, which component plane is spanned by a first direction (x) and a second direction (y) perpendicular to the first direction, the apparatus comprising a heating portion having a heating means for heating a first region of the component, a cooling portion having a cooling means for cooling a second region of the component; wherein the cooling portion is downstream of the heating portion in the second direction (y); wherein the cooling means has a nozzle for discharging a cooling fluid onto the component; wherein the nozzle is oriented such that it drops in the second direction (y); and wherein the nozzle has a fluid channel having a nozzle opening. By means such apparatus, components can be thermally treated individually in different regions.

Apparatus for the thermal treatment of a component, which can be arranged in a component plane (E) in the apparatus, which component plane is spanned by a first direction (x) and a second direction (y) perpendicular to the first direction, the apparatus comprising a heating portion having a heating means for heating a first region of the component, a cooling portion having a cooling means for cooling a second region of the component; wherein the cooling portion is downstream of the heating portion in the second direction (y); wherein the cooling means has a nozzle for discharging a cooling fluid onto the component; wherein the nozzle is oriented such that it drops in the second direction (y); and wherein the nozzle has a fluid channel having a nozzle opening. By means such apparatus, components can be thermally treated individually in different regions.

A railway wheel having, in mass %, C: 0.80 to 1.15%, Si: 1.00% or less, Mn: 0.10 to 1.25%, P: 0.050% or less, S: 0.030% or less, Al: 0.025 to 0.650%, N: 0.0030 to 0.0200%, Cr: 0 to 0.60%, and V: 0 to 0.12%, with the balance being Fe and impurities. The railway wheel has a hub part, a rim part including a tread and a flange, and a web part disposed between the hub part and the rim part. The area fraction of pearlite in the hub, web, and rim parts is 95% or more, and the amount of pro-eutectoid cementite is not more than 1.0 pieces/100 μm. The amount of pro-eutectoid cementite is calculated as (pieces/100 μm)=a total sum of the number of pieces of pro-eutectoid cementite which intersect with two diagonal lines in a square visual field of 200 μm×200 μm/(5.66×100 μm).

A method quenches a steel pipe and an apparatus quenches a steel pipe by which a steel pipe having excellent and uniform quality can be acquired by applying uniform rapid cooling to the steel pipe in a longitudinal direction as well as in a circumferential direction of the steel pipe using a simple unit. Movements of a heated steel pipe in a direction parallel to and in a direction perpendicular to a pipe axis of the steel pipe are stopped, and cooling water is jetted onto an outer surface of the steel pipe from four or more spray nozzles arranged spirally outside the steel pipe while rotating the steel pipe about the pipe axis.