Abstract: A paramagnetic stainless steel with a chemical composition may include iron and, by weight: 20?Cr?40%; 3?Ni?20%; 0?Mn?15%; 0?Al?5%; 3?Mo?15%; 0?W?5%; 0?Cu?2%; 0?Si?5%; 0?Ti?1%; 0?Nb?1%; 0?C?0.1%; 0?N?0.5%; 0?S?0.5%; 0?P?0.1%, and optionally impurities, each at a concentration of less than or equal to 0.5%. The steel may have a hardness in a range of from 575 to 900 HV10. A part, in particular a timepiece component, may be made from or include this steel.

Abstract: A paramagnetic stainless steel with a chemical composition including by weight: 26?Cr?40%, 5?Ni?20%, 0?Mn?5%, 0?Al?5%, 0?Mo?3%, 0?Cu?2%, 0?Si?5%, 0?Ti?1%, 0?Nb?1%, 0?C?0.1%, 0?N?0.1%, 0?S?0.5%, 0?P?0.1%, the remainder consisting of iron and any impurities each having a content less than or equal to 0.5%, the steel having a hardness HV10 between 500 and 900. It also relates to a part particularly a horological component made of this steel and to the process for manufacturing the part.

Abstract: An austenitic stainless-steel powder having a nickel content of less than or equal to 0.5% by weight and a specific carbon content that is greater than or equal to 0.05% and less than or equal to 0.11% by weight. A method for manufacturing the powder by powder metallurgy and parts resulting from the manufacturing method, which have the characteristic of having a deoxidised layer on the surface of the part extending over a thickness greater than or equal to 200 ?m.

Abstract: A method for manufacturing an austenitic stainless steel workpiece including the following successive steps: 1) providing a powder and sintering the powder to form a sintered alloy with an austenitic structure; the alloy having a nitrogen content greater than or equal to 0.1% by weight, 2) treating the sintered alloy to transform the austenitic structure into a ferritic structure or ferrite+ austenite two-phase structure on a surface layer of the alloy, 3) treating the sintered alloy to transform the ferritic or ferrite+ austenite two-phase structure obtained in step 2) into an austenitic structure and, after cooling, forming the workpiece which, on the layer subjected to the transformations in steps 2) and 3), has a density higher than that of the core of the workpiece. The present description also relates to the workpiece obtained by the method which has a very dense surface layer (?99%).

Abstract: 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.

Abstract: A paramagnetic stainless steel with a chemical composition including by weight: 26?Cr?40%, 5?Ni?20%, 0?Mn?5%, 0?Al?5%, 0?Mo?3%, 0?Cu?2%, 0?Si?5%, 0?Ti?1%, 0?Nb?1%, 0?C?0.1%, 0?N?0.1%, 0?S?0.5%, 0?P?0.1%, the remainder consisting of iron and any impurities each having a content less than or equal to 0.5%, the steel having a hardness HV10 between 500 and 900. It also relates to a part particularly a horological component made of this steel and to the process for manufacturing the part.

Abstract: A composite material having a grainy appearance, this composite material including a metal matrix which represents, in terms of volume fraction, between 50 and 95% of the grainy composite material, the ceramic particles having a diameter that lies in the range 0.1 to 2 mm and which represent, in terms of volume fraction, between 50 and 5% of the composite material are dispersed in the metal matrix and form the remainder of this grainy composite material. A method for manufacturing a grainy synthetic material.

Abstract: A high entropy alloy with a composition containing between 4 and 9 major alloying elements chosen from the list including Cr, Fe, V, Al, Si, Mn, Mo, Ti and Ni with: 3 major alloying elements which are Cr, Fe and V, each having an atomic concentration include between 20 and 40%, 1 or 2 major alloying elements chosen from Al and Si each having an atomic concentration higher than or equal to 5% with a total concentration of these 2 major alloying elements of less than or equal to 25%, 0, 1, 2, 3 or 4 major alloying elements chosen from Mn, Mo, Ti and Ni, each having an atomic concentration higher than or equal to 5% with a total atomic concentration of these 4 major alloying elements of less than or equal to 35%, the total atomic concentration of the 4 to 9 major alloying elements being higher than or equal to 80%, the remainder being made up of any impurities and/or one or more minor alloying elements, each in an atomic concentration of less than 5%.

Abstract: A method for manufacturing an austenitic stainless steel workpiece including the following successive steps: 1) providing a powder and sintering the powder to form a sintered alloy with an austenitic structure; the alloy having a nitrogen content greater than or equal to 0.1% by weight, 2) treating the sintered alloy to transform the austenitic structure into a ferritic structure or ferrite+austenite two-phase structure on a surface layer of the alloy, 3) treating the sintered alloy to transform the ferritic or ferrite+austenite two-phase structure obtained in step 2) into an austenitic structure and, after cooling, forming the workpiece which, on the layer subjected to the transformations in steps 2) and 3), has a density higher than that of the core of the workpiece. The present description also relates to the workpiece obtained by the method which has a very dense surface layer (?99%).

Abstract: 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.

Abstract: Nickel-free austenitic stainless steel comprising, in mass percent: chromium in amounts of 10<Cr<21%; manganese in amounts of 10<Mn<20%; molybdenum in amounts of 0<Mo<2.5%; copper in amounts of 0.5?Cu<4%; carbon in amounts of 0.15<C<<%; nitrogen in amounts of 0<N?1, and the remainder being formed by iron and any impurities from the melt.