Abstract: A method for producing a rolling bearing component includes providing a rolling bearing component formed from a rolling bearing steel, heating the rolling bearing component to form an austenitic microstructure, and cooling the rolling bearing component in a warm salt bath to a temperature below a martensite start temperature of the rolling bearing steel. The rolling bearing component has a wall thickness or a diameter of at least 85 mm at at least one point and includes a martensitic microstructure in an edge layer region and a microstructure consisting of pearlite and upper bainite in a core region after the cooling. A rolling bearing component produced by the method and a rolling bearing comprising the rolling bearing component are also disclosed.

Abstract: A method for producing a rolling bearing component includes providing a rolling bearing component formed from a rolling bearing steel, heating the rolling bearing component to form an austenitic microstructure, and cooling the rolling bearing component in a warm salt bath to a temperature below a martensite start temperature of the rolling bearing steel. The rolling bearing component has a wall thickness or a diameter of at least 85 mm at at least one point and includes a martensitic microstructure in an edge layer region and a microstructure consisting of pearlite or upper bainite in a core region after the cooling. A rolling bearing component produced by the method and a rolling bearing comprising the rolling bearing component are also disclosed.

Abstract: A method for producing rolling bearing components with a high degree of toughness, includes: providing at least one rolling bearing component made of a steel material with a high degree of purity and having 0.70-1.1 wt. % of carbon and a mixture of alloy elements of more than 1.75 wt. % and less than 3.4 wt. % including manganese, chromium, and silicon. In a first method variant, the steps of austenizing, quenching, cooling, tempering, and subsequently cooling to room temperature are carried out, and a residual austenite content lying between 15 vol. % and 25 vol. % is produced in an obtained martensitic matrix. In a second method variant, the steps of austenizing, quenching, heating, and cooling to room temperature are carried out, and a residual austenite content lying between 2 vol. % and 18 vol. % is produced in an obtained bainitic matrix.

Abstract: A method for producing a rolling bearing component includes forming the rolling bearing component from a 100CrMnSi6-4 or 100Cr6 rolling bearing steel, heating the rolling bearing component, quenching the rolling bearing component, heating the rolling bearing component and holding the rolling bearing component. The rolling bearing component to heated to an austenitizing temperature to form an austenitic microstructure. The rolling bearing component is quenched in a hot salt bath to a first temperature of between 170° C. and 200° C. such that there is a pearlitic or ferritic microstructure in a core region of the rolling bearing component. The rolling bearing component is heated to a second temperature between 220° C. and 280° C. The rolling bearing component is held at the second temperature for a holding time of at least 7 hours such that there is a predominantly bainitic microstructure formed on a surface of the rolling bearing component.

Abstract: A method for producing a rolling bearing component includes providing a rolling bearing component formed from a rolling bearing steel, heating the rolling bearing component to form an austenitic microstructure, and cooling the rolling bearing component in a warm salt bath to a temperature below a martensite start temperature of the rolling bearing steel. The rolling bearing component has a wall thickness or a diameter of at least 85 mm at at least one point and includes a martensitic microstructure in an edge layer region and a microstructure consisting of pearlite or upper bainite in a core region after the cooling. A rolling bearing component produced by the method and a rolling bearing comprising the rolling bearing component are also disclosed.

Abstract: A method of treating a valve body is disclosed herein. The method includes using a medium carbon steel, and treating the valve body to a carburizing heating step, an intermediate annealing step, a hardening step, and a tempering step. These steps provide a durable valve seat surface for the valve body such that the valve seat can withstand the conditions that involve high friction or otherwise intense operating conditions, such as oil and gas applications.

Abstract: The invention relates to a method for producing a rolling bearing ring featuring an improved robustness against the formation of white etching cracks (WEC), wherein the rolling bearing component, which is made of a hypo-eutectoid heat-treated steel containing C in an amount of 0.4-0.55% and Cr in an amount of 0.5-2.0% in order to form a hardened boundary layer, is inductively heated, then quenched and subsequently tempered.

Abstract: The invention relates to a method for producing a rolling bearing ring featuring an improved robustness against the formation of white etching cracks (WEC), wherein the rolling bearing component, which is made of a hypo-eutectoid heat-treated steel containing C in an amount of 0.4-0.55% and Cr in an amount of 0.5-2.0% in order to form a hardened boundary layer, is inductively heated, then quenched and subsequently tempered.

Abstract: A method for producing a rolling bearing component with a carbon gradient, at least in the region of its outer layer, wherein molten metal is sprayed onto a carrier in a spraying process, the carbon content of the metal to be sprayed on being varied during the spraying operation.

Abstract: A rolling bearing having an outer ring, an inner ring and rolling bodies which roll on raceways of the rings. The raceway of the inner and/or outer ring and/or the surface of the rolling bodies has a burnishing layer, and the inner and/or the outer ring and/or the rolling bodies are formed of a steel which has a hardness of at least 58 HRC at least below the burnishing layer and which, at least below the burnishing layer, has: a nitrogen content at least in the marginal layer of 0.03-0.8%, the nitrogen being at least partially dissolved, a carbon content at least in the marginal layer of 0.1-1.2%, a nickel content of ?0.4%, a silicon content of 0.2-1.0%, a chromium content of ?1.0%, a sulfur content of ?0.008%, an oxygen content of ?15 ppm, and a titanium content of ?50 ppm.

Abstract: The invention provides a needle bearing which has an extraordinarily large number of contact points and allows a long life to be expected even in a corrosive and/or hydrogen-containing working atmosphere. This is achieved by means of a needle bearing which has a bearing ring with a hardened austenitic steel which has a total carbon and nitrogen content of from 0.8 to 1.2% by weight and needles which roll on a bearing surface of the bearing ring and are composed of a ceramic whose surface defects are smaller than 40 ?m.

Abstract: A method for producing a rolling bearing component with a carbon gradient, at least in the region of its outer layer, wherein molten metal is sprayed onto a carrier in a spraying process, the carbon content of the metal to be sprayed on being varied during the spraying operation.

Abstract: The aim of the method is to achieve a higher penetration depth of the diffusion element coupled with a greater depth of case hardening and a higher case hardening degree, whilst preventing an excessive enrichment of the case, thus obtaining an increased fatigue limit for the component. To achieve this, the full hardening of the component and the plasma-ion hardening of the case of the component are carried out in a common working step. The component is heated to a common hardening and diffusion temperature TH+D lying above the upper transformation temperature AC3, the component being held at the common hardening and diffusion temperature TH+D until the carbon in the component has fully austenitized and dissolved and until the case has been enriched to the desired degree by the diffusion element. The component is then quenched.