A cooling device configured to cool an article to be processed by spraying a coolant includes a cooling chamber configured to accommodate the article to be processed, a header pipe having a connecting pipe protruding from a main body section to which a nozzle is attached and into which the coolant supplied into the main body section is supplied, and disposed in the cooling chamber, and an attachment section formed at the cooling chamber and into which the connecting pipe is inserted from an inside of the cooling chamber to an outside of the cooling chamber.

A track pin for a track chain assembly includes a body made from a steel alloy. The steel alloy has a composition comprising iron, a nitride-forming element, and silicon. The composition of the steel alloy comprises at least 0.5 percent by weight of silicon. The body includes an external nitrided surface.

A hot-pressed steel sheet member includes a specific chemical composition and further includes a steel structure in which an area ratio of ferrite in a surface layer portion ranging from a surface to 15 m in depth is greater than 1.20 times an area ratio of ferrite in an inner layer portion being a portion excluding the surface layer portion, and the inner layer portion contains a steel structure represented, in area %, ferrite: 10% to 70%, martensite: 30% to 90%, and a total area ratio of ferrite and martensite: 90% to 100%. A tensile strength of the hot-pressed steel sheet member is 980 MPa or more.

A hot-pressed steel sheet member includes a specific chemical composition and further includes a steel structure in which an area ratio of ferrite in a surface layer portion ranging from a surface to 15 m in depth is greater than 1.20 times an area ratio of ferrite in an inner layer portion being a portion excluding the surface layer portion, and the inner layer portion contains a steel structure represented, in area %, ferrite: 10% to 70%, martensite: 30% to 90%, and a total area ratio of ferrite and martensite: 90% to 100%. A tensile strength of the hot-pressed steel sheet member is 980 MPa or more.

In a process for producing a cold- or hot-rolled steel strip from an ultrahigh-strength multiphase steel having a particular composition the required multiphase microstructure is generated during continuous heat treatment. The cold- or hot-rolled steel strip is heated in the continuous heat treatment furnace to a temperature in the range from 700 to 950 C. and the heat-treated steel strip is subsequently cooled from the heat treatment temperature at a cooling rate of from 15 to 100 C./s to a first intermediate temperature of from 300 to 500 C. followed by cooling at a cooling rate of from 15 to 100 C./s to a second intermediate temperature of from 200 to 250 C.; the steel strip is subsequently cooled at a cooling rate of from 2 to 30 C./s in air to room temperature or the cooling at a cooling rate of from 15 to 100 C./s is maintained from the first intermediate temperature to room temperature.

A turbine blade designing method is for designing a turbine blade formed using a metal material in which creep including diffusion creep and dislocation creep occurs by heating. The turbine blade designing method includes: acquiring temperature distribution data relating to temperature distribution in the turbine blade to be heated; acquiring creep strength distribution data relating to distribution of the creep strength required for the turbine blade to be heated; from the correlation data, based on the temperature distribution data and the creep strength distribution data, setting the crystal grain size of a high-temperature portion that is the diffusion creep temperature range of the turbine blade to a size coarser than the reference crystal grain size, and setting the crystal grain size of a low-temperature portion that is the dislocation creep temperature range of the turbine blade to a size finer than the reference crystal grain size.

Provided is a method for nitriding a grain-oriented electrical steel sheet which is very useful in obtaining excellent magnetic properties with no variation, that enables generating glow discharge between positive electrodes and negative electrodes disposed in a nitriding zone and irradiating the generated plasma to a strip to perform appropriate nitriding.

Example methods and apparatus for hardening a component or any semi-finished product formed from a steel workpiece that has been shaped in a shaping tool may involve introducing the component into a receiving region of a hardening tool. The hardening tool may then be closed around the component in a form-fitting manner so as to surround the component and maintain a substantially constant distance between the component and at least one induction coil integrated into the hardening tool. The induction coil of the hardening tool may then be used to heat the component. The component may then be cooled within the receiving region or by removing the component from the receiving region and exposing the component to air external to the receiving region.

A direct resistance heating method includes placing a first electrode and a second electrode on a plate-shaped workpiece such that the first electrode and the second electrode extend across the workpiece in a direction substantially perpendicular to a center line of a heating target region of the workpiece, the center line connecting a middle portion of one side of the heating target region and a middle portion of the other side of the heating target region; and moving at least one of the first electrode and the second electrode along the center line while applying electric current between the first electrode and the second electrode.

A system and method of making a part. The part may cast in a die. A gripper assembly may be provided that has a gripper and a spray nozzle that provides a fluid. The part may be quenched with a fluid when the part is in the die.