The invention concerns a method for heat treatment of an austenitic steel of the High Nitrogen Steel or austenitic HNS type, or of an austenitic steel of the High Interstitial Steel or austenitic HIS type, said austenitic HNS or austenitic HIS containing precipitates of nitrides, carbides or carbonitrides of chromium and/or of molybdenum, this method comprising the step which consists, after machining the austenitic HNS or austenitic HIS containing the precipitates, in redissolving the precipitates by bringing the austenitic HNS or austenitic HIS to its austenitizing temperature, then cooling the austenitic HNS or austenitic HIS sufficiently rapidly to avoid the re-formation of precipitates.

The invention also concerns different heat treatment methods allowing chromium and/or molybdenum nitride, carbide or carbonitride type precipitates to appear in an austenitic HNS or austenitic HIS. Indeed, the presence of these precipitates in the matrix of the austenitic HNS or austenitic HIS makes machining operations easier by promoting the formation and removal of chips during machining of the components.

A method for producing an alloy steel composition includes the following steps: performing a first heat treatment on an alloy steel composition and maintaining for a first time period to soften the alloy steel composition; performing a first cooling treatment on the softened alloy steel composition; performing a treatment on the softened the alloy steel composition to form a workpiece; performing a second heat treatment on the workpiece and maintaining for a second time period; and performing a second cooling treatment on the workpiece to make the workpiece become to be a Bainite structure, and a cooling rate of the second cooling treatment is high than the cooling rate of the first cooling treatment.

A steel reinforcing bar contains 0.06 wt % to 0.11 wt % carbon, more than 0 and not more than 0.25 wt % silicon, 0.8 wt % or more and less than 2.0 wt % manganese, more than 0 and not more than 0.01 wt % phosphorus, more than 0 and not more than 0.01 wt % sulfur, 0.01 to 0.03 wt % aluminum, 0.50 to 1.00 wt % nickel, 0.027 to 0.125 wt % molybdenum, more than 0 and not more than 0.25 wt % chromium, more than 0 and not more than 0.28 wt % copper, more than 0 and not more than 0.01 wt % nitrogen, and the remainder being iron and unavoidable impurities. The reinforcing bar has a surface layer and a core. The surface layer has a hardened layer of tempered martensite, and the core has a mixed structure of bainite, ferrite and pearlite.

A sandwich structure forming method including the steps of (1) providing a sandwich structure comprising a core positioned between a first liner sheet and a second liner sheet; (2) positioning the sandwich structure into a cavity of a die assembly; and (3) pressurizing the core to expand the sandwich structure into engagement with the die assembly.

An induction hardening apparatus and methods are provided. The induction hardening apparatus includes a feed line having first and second ends. A coil assembly is positioned between the first and second ends. The feed line includes a support arrangement for supporting two workpieces against one another and transferring the workpieces simultaneously through the coil assembly along a feed axis defined by the feed line.

The present invention relates to a method of hardening slides of a perforating press comprising providing a steel beam; hardening of the steel beam in a vacuum furnace; tempering the steel beam twice; first straightening of the steel beam at a temperature of 20° C. ± 10° C.; milling of an at least partially continuous sawtooth profile, along a longitudinal direction of the steel beam, on a first side of the steel beam; wherein, after milling the at least partially continuous sawtooth profile on the first side of the steel beam, a second side of the steel beam, lying opposite the first side, is hardened by means of induction currents, after which the steel beam is again tempered twice and after which the steel beam is straightened a second time at a temperature of 20° C. ± 10° C. The invention also relates to a slide for a perforating press hardened according to the method.

A method for manufacturing a blade, the method includes casting a nickel alloy blade precursor having an airfoil and a root. The airfoil and the root are solution heat treating differently from each other. After the solution heat treating, the root is wrought processed. After the wrought processing, an exterior of the root is machined.

A process for reducing flatness deviations in an alloy article is disclosed. An alloy article may be heated to a first temperature at least as great as a martensitic transformation start temperature of the alloy. A mechanical force may be applied to the alloy article at the first temperature. The mechanical force may tend to inhibit flatness deviations of a surface of the alloy article. The alloy article may be cooled to a second temperature no greater than a martensitic transformation finish temperature of the alloy. The mechanical force may be maintained on the alloy article during at least a portion of the cooling of the alloy article from the first temperature to the second temperature.

A process for reducing flatness deviations in an alloy article is disclosed. An alloy article may be heated to a first temperature at least as great as a martensitic transformation start temperature of the alloy. A mechanical force may be applied to the alloy article at the first temperature. The mechanical force may tend to inhibit flatness deviations of a surface of the alloy article. The alloy article may be cooled to a second temperature no greater than a martensitic transformation finish temperature of the alloy. The mechanical force may be maintained on the alloy article during at least a portion of the cooling of the alloy article from the first temperature to the second temperature.

An annealing system and method of operating is described. The annealing system includes a furnace having a vacuum chamber wall that defines a processing space into which a plurality of workpieces may be translated and subjected to thermal and magnetic processing, wherein the furnace further includes a heating element assembly having at least one heating element located radially inward from the vacuum chamber wall and immersed within an outer region of the processing space, and wherein the heating element is composed of a non-metallic, anti-magnetic material. The annealing system further includes a magnet system arranged outside the vacuum chamber wall of the furnace, and configured to generate a magnetic field within the processing space.