A railway wheel in which formation of pro-eutectoid cementite is suppressed is stably produced.

After heating an intermediate product containing, in mass %, C: 0.80 to 1.15% to a temperature not less than A.sub.cm transformation point, the intermediate product is cooled such that the cooling rate ( C./sec) in a range from 800 to 500 C. satisfies the following conditions: Surface other than the tread and the flange surface: not more than Fn1 defined by Formula (1), Cooling rate in a region in which cooling rate is slowest: not less than Fn2 defined by Formula (1), and Tread and flange surface: not less than Fn2:

Fn1=5.0+exp(5.6511.427C1.280Si0.7723Mn1.815Cr1.519Al7.798V)(1)

Fn2=0.515+exp(24.816+24.121C+1.210Si+0.529Mn+2.458Cr15.116Al5.116V)(2)

Cooling section for a steel strip continuous annealing or galvanizing line arranged to handle a metal strip (1), said section comprising at least one area (2) for dry cooling set up to project gas on said steel strip and at least one wet cooling area (5) set up to project a liquid or a mixture of gas and liquid on said steel strip.

A method for manufacturing a thermally treated steel sheet is described. The method includes: A. preparation step containing: 1) a selection substep, wherein: a. m.sub.target and a chemical composition are compared to a list of predefined products, whose microstructure contains predefined phases and predefined proportion of phases, and a product having a microstructure m.sub.standard closest to m.sub.target and TP.sub.standard is selected, including at least a heating, a soaking and a cooling steps, to obtain m.sub.standard, b. a heating path, a soaking path including a soaking temperature T.sub.soaking, a power cooling of the cooling system and a cooling temperature T.sub.cooling are selected based on TP.sub.standard and 2) a calculation substep, wherein through variation of the cooling power, new cooling paths CP.sub.x are calculated based on the product selected in step A.1)a and TP.sub.standard, the initial microstructure m.sub.i of the steel sheet to reach m.sub.target, the heating path, the soaking path comprising T.sub.soaking and T.sub.cooling, the cooling step of TP.sub.standard is recalculated using said CP.sub.x in order to obtain new thermal paths TP.sub.x, each TP.sub.x corresponding to a microstructure m.sub.x, 3) a selection substep wherein one TP.sub.target to reach m.sub.target is selected, TP.sub.target being chosen among the calculated thermal paths TP.sub.x and being selected such that m.sub.x is the closest to m.sub.target, and B. a thermal treatment step wherein TP.sub.target is performed on the steel sheet.

Method for reducing unevenness in a strip subjected to cooling by spraying of liquid, or a mixture of gas and liquid, along a cooling zone of a continuous heat treatment one, the cooling intensity being adjusted in the direction of travel of the strip so as to achieve a relative position between the Leidenfrost temperature and at least one temperature at which the metallurgical structure changes such that said cooling intensity minimizes the internal stresses of the strip, and device for implementing the method.

A cooling system according to an embodiment of the present invention may comprise: a cooling part which supplies a cooling fluid to a strip; and a boiling film removal part, which physically comes into contact with the strip and removes a boiling film formed by the cooling fluid. The boiling film removal part according to the embodiment may be disposed at a position where a nuclear boiling and a film boiling are mixed together along a widthwise direction of the strip.

Cooling equipment comprising: a plurality of injection units in a continuous annealing furnace including heating zone, soaking zone, and cooling zone through which strip-shaped steel sheet is sequentially fed, the injection units arranged in cooling zone in row along feed direction of steel sheet and injecting, from injection nozzles, cooling gas containing hydrogen, onto steel sheet; and hydrogen concentration adjustment unit adjusts hydrogen concentration of cooling gas such that hydrogen concentration distribution is formed in which, in a space of the cooling zone where plurality of injection units are disposed, hydrogen concentration at upstream region is higher than hydrogen concentration at downstream region; plurality of injection nozzles arranged along feed direction of steel sheet, and each of injection nozzles extending toward steel sheet; and injection nozzles positioned at both sides in array direction inclined to slope toward a center of the array direction on progression toward tips of injection nozzles.

A method of processing a workpiece to inhibit precipitation of intermetallic compounds includes at least one of thermomechanically processing and cooling a workpiece including an austenitic alloy. During the at least one of thermomechanically working and cooling the workpiece, the austenitic alloy is at temperatures in a temperature range spanning a temperature just less than a calculated sigma solvus temperature of the austenitic alloy down to a cooling temperature for a time no greater than a critical cooling time.

A high entropy steel in which twinning and phase transformation are simultaneously performed, and a method of manufacturing the same, are provided. The high entropy steel includes three or more alloying elements selected from the following, by atomic percentage: iron (Fe) from 35% to 80%, nickel (Ni) from 5% to 35%, manganese (Mn) from 5% to 35%, cobalt (Co) from 5% to 35%, and chromium (Cr) from 5% to 35%

A method for manufacturing a thermally treated steel sheet is described. The method includes: A. a preparation step including: 1) a selection substep, wherein the chemical composition and m.sub.target are compared to a list of predefined products, which microstructure includes predefined phases and predefined proportion of phases, and selecting a product having a microstructure m.sub.standard closest to m.sub.target and a predefined thermal path TP.sub.standard to obtain m.sub.standard, 2) a calculation substep, wherein at least two thermal path TP.sub.x, each TP.sub.x corresponding to a microstructure mx obtained at the end of TP.sub.x, are calculated based on the selected product of step A.1) and TP.sub.standard and the initial microstructure mi of the steel sheet to reach m.sub.target, 3) an selection substep, wherein one thermal path TP.sub.target to reach m.sub.target is selected, TP.sub.target chosen from TP.sub.x and selected such that m.sub.x is the closest to m.sub.target, B. a thermal treatment step, wherein TP.sub.target is performed on the steel sheet.

A method for manufacturing a thermally treated steel sheet is described. The method includes: A. preparation step containing: 1) a selection substep, wherein: a. m.sub.target and a chemical composition are compared to a list of predefined products, whose microstructure contains predefined phases and predefined proportion of phases, and a product having a microstructure m.sub.standard closest to m.sub.target and TP.sub.standard is selected, including at least a heating, a soaking and a cooling steps, to obtain m.sub.standard, b. a heating path, a soaking path including a soaking temperature T.sub.soaking, a power cooling of the cooling system and a cooling temperature T.sub.cooling are selected based on TP.sub.standard and 2) a calculation substep, wherein through variation of the cooling power, new cooling paths CP.sub.x are calculated based on the product selected in step A.1) a and TP.sub.standard, the initial microstructure m.sub.i of the steel sheet to reach m.sub.target, the heating path, the soaking path comprising T.sub.soaking and T.sub.cooling, the cooling step of TP.sub.standard is recalculated using said CP.sub.x in order to obtain new thermal paths TP.sub.x, each TP.sub.x corresponding to a microstructure m.sub.x, 3) a selection substep wherein one TP.sub.target to reach m.sub.target is selected, TP.sub.target being chosen among the calculated thermal paths TP.sub.x and being selected such that m.sub.x is the closest to m.sub.target, and B. a thermal treatment step wherein TP.sub.target is performed on the steel sheet.