The present invention relates to a steel part for use in aeronautics, comprising a substrate, the substrate comprising at least carbon, cobalt, aluminium and nickel, and having an average atomic fraction of carbon between 0.09% and 0.17%, an average atomic fraction of cobalt between 15.5% and 18.5%, an average atomic fraction of aluminium less than 0.1%, an average atomic fraction of nickel between 7.2% and 9.8%, the part being case-hardened and also comprising a nitrided layer, the nitrided layer at least partially covering the substrate and having a thickness between 5 μm to 180 μm, preferably between 50 μm and 150 μm.

The present invention relates to a steel part for use in aeronautics, comprising a substrate, the substrate comprising at least carbon, cobalt, aluminium and nickel, and having an average atomic fraction of carbon between 0.09% and 0.17%, an average atomic fraction of cobalt between 15.5% and 18.5%, an average atomic fraction of aluminium less than 0.1%, an average atomic fraction of nickel between 7.2% and 9.8%, the part being case-hardened and also comprising a nitrided layer, the nitrided layer at least partially covering the substrate and having a thickness between 5 μm to 180 μm, preferably between 50 μm and 150 μm.

A high strength stainless steel seamless pipe for oil country tubular goods which is excellent in hot workability, has a high strength, suppresses scattering in the strength, and has excellent carbon dioxide corrosion resistance. The steel pipe has a yield strength of 655 MPa or more, and a chemical composition comprising, by mass %, C: 0.005 to 0.05%, Si: 0.05 to 0.50%, Mn: 0.20 to 1.80%, P: 0.030% or less, S: 0.005% or less, Cr: 12.0 to 17.0%, Ni: 4.0 to 7.0%, Mo: 0.5 to 3.0%, Al: 0.005 to 0.10%, V: 0.005 to 0.20%, Co: 0.01 to 1.0%, N: 0.005 to 0.15%, and O: 0.010% or less with the balance being Fe and inevitable impurities. Cr, Ni, Mo, Cu, and C satisfy a specified expression, and Cr, Mo, Si, C, Mn, Ni, Cu, and N satisfy another specified expression.

Apparatus and method for construction of a rectangular deep cryogenic treatment chamber using an insulated, steel structure capable of large size and large volume cold thermal treatment. Apparatus includes end or top-mounted closure, liquid nitrogen delivery and distribution mechanisms, fan motors, cold diffusion-less thermal exchange, external heating element, electrical wiring and machined components. The design facilitates both low temperature, dry vapor thermal processing of metal and metal-matrix components down to −320° F. to enhance wear, corrosion, mechanical, thermal and electrical characteristics, and also post-cryogenic tempering capability to 300° F. The apparatus describes an external, LN2 storage dewar and solenoid-activated, gravity fed cryogen delivery via distribution hubs and distributed flow tubes. The apparatus also describes integrated deep cryogenic treatment authentication, test, validation and certification equipment. The process and method of treatment results in certification documents that authenticate and confirm treatment of the subject parts, reflect test and measurement of improved characteristics, retained data for archival purposes and to provide scientific evidence and proof of such treatment to a third-party not present at time of treatments, test or certification

Apparatus and method for construction of a rectangular deep cryogenic treatment chamber using an insulated, steel structure capable of large size and large volume cold thermal treatment. Apparatus includes end or top-mounted closure, liquid nitrogen delivery and distribution mechanisms, fan motors, cold diffusion-less thermal exchange, external heating element, electrical wiring and machined components. The design facilitates both low temperature, dry vapor thermal processing of metal and metal-matrix components down to −320° F. to enhance wear, corrosion, mechanical, thermal and electrical characteristics, and also post-cryogenic tempering capability to 300° F. The apparatus describes an external, LN2 storage dewar and solenoid-activated, gravity fed cryogen delivery via distribution hubs and distributed flow tubes. The apparatus also describes integrated deep cryogenic treatment authentication, test, validation and certification equipment. The process and method of treatment results in certification documents that authenticate and confirm treatment of the subject parts, reflect test and measurement of improved characteristics, retained data for archival purposes and to provide scientific evidence and proof of such treatment to a third-party not present at time of treatments, test or certification

A method of making a forged, martensitic, stainless steel alloy is provided. The alloy is a forged preform of martensitic, pitting corrosion resistant stainless steel alloy comprising, by weight: 12.0 to 16.0 percent chromium; greater than 16.0 to 20.0 percent cobalt, 6.0 to 8.0 percent molybdenum, 1.0 to 3.0 percent nickel, 0.02 to 0.04 percent carbon; and the balance iron and incidental impurities. The alloy has a microstructure that comprises a retained austenite phase less than or equal to 2 percent by volume of the microstructure. The method heats the preform to a solutionizing temperature to form a solutionized microstructure. The preform is cooled with a liquid to room temperature. The preform is immersed in a cryo-liquid to transform the retained austenite phase in the microstructure to martensite. The preform is heated to a temperature of less than 600° F. for a time sufficient to form a tempered forged preform.

A drill tool capable of coping with a rock drill having high output power and a method for producing the drill tool are described. The drill tool is produced by employing, as a drill tool material, an alloy steel composed of the following chemical components: 0.22 to 0.26 wt % of C, 0.15 to 0.35 wt % of Si, 0.55 to 0.80 wt % of Mn, 2.60 to 3.00 wt % of Ni, 1.00 to 1.50 wt % of Cr, 0.20 to 0.30 wt % of Mo, and Fe and inevitable impurities as the balance. Heat treatment with quenching is performed after carburizing performed by means of oil cooling with cold oil and a tempering temperature set at 400 to 440° C.

A method for increasing tensile strength in a workpiece, the method including obtaining a workpiece to be treated, heating the workpiece to an elevated temperature, inducing a magnetic field onto the workpiece, detecting a natural oscillation frequency of the workpiece, generating a frequency onto the workpiece in response to the detected natural oscillation frequency of the workpiece, monitoring continuously a frequency of the workpiece, inducing multiple applied forces on the workpiece to maintain the frequency at which the workpiece is oscillated, and thermal quenching the workpiece to below ambient temperature.

A method for increasing tensile strength in a workpiece, the method including obtaining a workpiece to be treated, heating the workpiece to an elevated temperature, inducing a magnetic field onto the workpiece, detecting a natural oscillation frequency of the workpiece, generating a frequency onto the workpiece in response to the detected natural oscillation frequency of the workpiece, monitoring continuously a frequency of the workpiece, inducing multiple applied forces on the workpiece to maintain the frequency at which the workpiece is oscillated, and thermal quenching the workpiece to below ambient temperature.

A method of producing an additively manufactured object comprises: a step of cooling a shaped body of an alloy formed by additive manufacturing to 0° C. or lower; and a step of aging the shaped body under a temperature condition of 400° C. or higher and 600° C. or lower after the step of cooling the shaped body. The alloy contains: Fe as a main component; 17.0 mass % or more and 19.0 mass % or less of Ni; 7.0 mass % or more and 12.5 mass % or less of Co; 4.6 mass % or more and 5.2 mass % or less of Mo; 0.13 mass % or more and 1.6 mass % or less of Ti; and 0.05 mass % or more and 0.15 mass % or less of Al.