{"id":510,"date":"2023-01-26T14:31:45","date_gmt":"2023-01-26T13:31:45","guid":{"rendered":"http:\/\/haertha.dev.neuekommunikation.de\/wordpress\/?post_type=verfahren&#038;p=510"},"modified":"2025-10-16T06:43:16","modified_gmt":"2025-10-16T04:43:16","slug":"stress-free-annealing","status":"publish","type":"verfahren","link":"https:\/\/haertha.de\/en\/process\/stress-free-annealing\/","title":{"rendered":"stress-free annealing"},"content":{"rendered":"<div id=\"verfahren-header-image-block_260f938cfe9c255fd8a971908db5b36b\" class=\"verfahren-header-image\" >   \r\n\r\n    <div class=\"image-wrapper\">\r\n                    <img decoding=\"async\" class=\"img-fluid\" src=\"https:\/\/haertha.de\/wp-content\/uploads\/2023\/01\/Gluehen_P1002837_beitragsbild.png\" alt=\"\" \/>\r\n            <\/div>\r\n\r\n    \r\n<\/div>\r\n\r\n\n\n\n<p><\/p>\n\n\n\r\n<div id=\"verfahren-text-block_d79ad4d885876355d8d2d48fa6e2fff4\" class=\"verfahren-text toc\" data-toctitle=\"Das Verfahren und seine Vorteile\" style=\"\">\r\n    <div class=\"row\">\r\n        <div class=\"col-12\">\r\n            <div class=\"content-wrapper\" >\r\n\r\n                            <div class=\"box\">\r\n                                            <div class=\"nummber\"> \r\n                            \r\n                        <\/div>\r\n                        \r\n                                            <h2 class=\"headline\">The process and its advantages<\/h2>\r\n                                \r\n                <\/div>\r\n            \r\n                <div class=\"content-box texteditor\" style=\"\">                    \r\n                    <p><p class=\" translation-block\"><a href=\"https:\/\/haertha.de\/en\/service\/\" target=\"_self\">Stress-free annealing<\/a>  is used to reduce intrinsic tensions in metallic microstructures. The process prevents the intrinsic stresses in the metal from combining with load stresses that can occur through further processing or use of the workpiece. This <strong>protects the workpiece from warping and breakage.<\/strong><\/p>\n<p>&nbsp;<\/p>\n<p class=\" translation-block\"><strong>Processes that can lead to intrinsic stresses <\/strong>in the metal include:<\/p>\n<ul>\n<li>Metal-cutting machining such as turning or milling<\/li>\n<li>Welding<\/li>\n<li class=\" translation-block\"><strong>Cold forming<\/strong> such as deep drawing or bending<\/li>\n<li class=\" translation-block\"><strong>Uneven cooling <\/strong>caused by, for example, prevention of contraction during casting<\/li>\n<li>Microstructural transformation<\/li>\n<\/ul>\n<p class=\" translation-block\"><br>\nIf executed properly, stress-free annealing can generally reduce stresses by <strong>up to 90%<\/strong>. Stress-free annealing can take place in a convection furnace.<\/p>\n<p>&nbsp;<\/p>\n<p class=\" translation-block\">In order to protect the workpiece surface from oxidation, stress-free annealing is carried out in a <strong>protective gas furnace<\/strong>. For applications that impose stringent requirements on the component surface, treatment in a vacuum furnace may also be considered.<\/p>\n<p>&nbsp;<\/p>\n<h3><span style=\"font-weight: 400;\">Individual phases<\/span><\/h3>\n<p>&nbsp;<\/p>\n<p class=\" translation-block\">Stress-free annealing is essentially divided into three phases: <strong>warming up, dwelling, and cooling.<\/strong> During the warm-up time, the material is heated. This warm-up phase is followed by a dwell time that lasts four to six hours at a constant temperature.<\/p>\n<p>&nbsp;<\/p>\n<p>The annealing temperature and the annealing time play essential roles in the success of the process. Finally, during the cooling time, the workpiece is slowly cooled in the air or in the furnace, in order to prevent stresses and cracking from reoccurring.<\/p>\n<p>&nbsp;<\/p>\n<p>Both the warm-up phase and the cooling phase should be carried out in a slow and controlled manner in accordance with the thermal conductivity of the material. This ensures a low temperature gradient between the surface and the core of the workpiece. If performed too fast, the warm-up or cooling phase can lead to new stresses. This is of particular significance for workpieces with large differences in shape and wall thickness.<\/p>\n<p>&nbsp;<\/p>\n<h3><span style=\"font-weight: 400;\">The advantages at a glance<\/span><\/h3>\n<p>&nbsp;<\/p>\n<p>The advantages offered by stress-free annealing include:<\/p>\n<ul>\n<li>Reduction of stresses by more than 90%<\/li>\n<li class=\" translation-block\"><strong>Improved machinability<\/strong> of the material and thus extended service life for tools<\/li>\n<li>Further processing possible with minimum warping<\/li>\n<li><strong>Risk of cracking is minimised<\/strong><\/li>\n<li>No increased hardness on the component surface<\/li>\n<li>Greater precision<\/li>\n<li>Short processing times thanks to low machining allowance<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<\/p>\r\n                    <div class=\"acf-innerblocks-container\"><\/div>\r\n                    \r\n                    <style>\r\n                        .sonder-zeichen{\r\n                            display: flex;\r\n                            flex-direction: row;\r\n                            gap: 15px;\r\n                        }\r\n                        .zeichen{\r\n                            color: #C9C9C9;\r\n                            position: relative;\r\n                            line-height: 66px;\r\n                            font-size: clamp(2.75rem, 1.9766rem + 2.1484vw, 4.125rem);\r\n                        }\r\n                    <\/style>\r\n                    \r\n                <\/div>\r\n            <\/div>\r\n        <\/div>\r\n    <\/div>\r\n<\/div>\r\n\r\n\r\n\r\n\r\n\n\n\r\n<div id=\"verfahren-text-block_b287b9cf320fca4f2bfa206058e3001c\" class=\"verfahren-text toc\" data-toctitle=\"Anwendungsbereiche\" style=\"\">\r\n    <div class=\"row\">\r\n        <div class=\"col-12\">\r\n            <div class=\"content-wrapper\" >\r\n\r\n                            <div class=\"box\">\r\n                                            <div class=\"nummber\"> \r\n                            \r\n                        <\/div>\r\n                        \r\n                                            <h2 class=\"headline\">the process and its advantages<\/h2>\r\n                                \r\n                <\/div>\r\n            \r\n                <div class=\"content-box texteditor\" style=\"\">                    \r\n                    <p><p>Stress-free annealing is useful after the rough machining of workpieces. It is, for example, suitable for removing stresses from welded structures.<\/p>\n<p>&nbsp;<\/p>\n<p class=\" translation-block\">Moreover, this process is a good preparatory measure for the fine machining of workpieces. For example, components having low dimensional tolerances that are to be treated by <a href=\"https:\/\/haertha.de\/en\/verfahren\/nitrocarburieren\/\" target=\"_self\">nitrocarburising<\/a> must be as tension-free as possible.<\/p>\n<\/p>\r\n                    <div class=\"acf-innerblocks-container\"><\/div>\r\n                    \r\n                    <style>\r\n                        .sonder-zeichen{\r\n                            display: flex;\r\n                            flex-direction: row;\r\n                            gap: 15px;\r\n                        }\r\n                        .zeichen{\r\n                            color: #C9C9C9;\r\n                            position: relative;\r\n                            line-height: 66px;\r\n                            font-size: clamp(2.75rem, 1.9766rem + 2.1484vw, 4.125rem);\r\n                        }\r\n                    <\/style>\r\n                    \r\n                <\/div>\r\n            <\/div>\r\n        <\/div>\r\n    <\/div>\r\n<\/div>\r\n\r\n\r\n\r\n\r\n\n\n\r\n<div id=\"verfahren-text-block_6219123814c5d3ce0f5d51f168676a31\" class=\"verfahren-text toc\" data-toctitle=\"Geeignete Werkstoffe und Temperaturen \" style=\"\">\r\n    <div class=\"row\">\r\n        <div class=\"col-12\">\r\n            <div class=\"content-wrapper\" >\r\n\r\n                            <div class=\"box\">\r\n                                            <div class=\"nummber\"> \r\n                            \r\n                        <\/div>\r\n                        \r\n                                            <h2 class=\"headline\">Suitable materials and temperatures <\/h2>\r\n                                \r\n                <\/div>\r\n            \r\n                <div class=\"content-box texteditor\" style=\"\">                    \r\n                    <p><p class=\" translation-block\"><strong>The correct annealing temperature <\/strong>is essential for achieving the desired result. It is dependent, among other factors, on the type of material and the pre-treatment. \n<strong>Quenched and tempered steels <\/strong>, for example, are annealed at least 30 \u00b0C below the last tempering temperature. Hardened cast irons cannot be annealed at all, because the annealing temperature would trigger a tempering effect.<\/p>\n<p>&nbsp;<\/p>\n<p class=\" translation-block\"><strong>Untempered castings<\/strong> are suitable for annealing. The correct temperature depends on the alloy composition. For non-alloy grades of cast iron, the temperature is 500 \u00b0C to 550\n\u00b0C, for low-alloy grades, 550 \u00b0C to 600 \u00b0C, and for high-alloy grades, 600 \u00b0C to 650 \u00b0C.<\/p>\n<p>&nbsp;<\/p>\n<p class=\" translation-block\"><strong>Fine grain steels <\/strong>are annealed at temperatures below 580 \u00b0C, because they will otherwise experience coarsening of the microstructure. Stainless steels are usually treated using  <a href=\"https:\/\/haertha.de\/en\/verfahren\/loesungsgluehen\/\" target=\"_self\">solution annealing<\/a>.<\/p>\n<p>&nbsp;<\/p>\n<p class=\" translation-block\"><strong>Copper and brass components<\/strong> can also be treated using stress-free annealing. Depending on the composition of the alloy, the annealing temperature for brass components ranges between 250 \u00b0C and 500 \u00b0C, and for copper workpieces between 150 \u00b0C and 275 \u00b0C.<\/p>\n<\/p>\r\n                    <div class=\"acf-innerblocks-container\"><\/div>\r\n                    \r\n                    <style>\r\n                        .sonder-zeichen{\r\n                            display: flex;\r\n                            flex-direction: row;\r\n                            gap: 15px;\r\n                        }\r\n                        .zeichen{\r\n                            color: #C9C9C9;\r\n                            position: relative;\r\n                            line-height: 66px;\r\n                            font-size: clamp(2.75rem, 1.9766rem + 2.1484vw, 4.125rem);\r\n                        }\r\n                    <\/style>\r\n                    \r\n                <\/div>\r\n            <\/div>\r\n        <\/div>\r\n    <\/div>\r\n<\/div>\r\n\r\n\r\n\r\n\r\n\n\n\r\n<div id=\"verfahren-text-block_1650bcd9c20a2df0a4f4660507ce880a\" class=\"verfahren-text toc\" data-toctitle=\"Ofengr\u00f6\u00dfe\" style=\"\">\r\n    <div class=\"row\">\r\n        <div class=\"col-12\">\r\n            <div class=\"content-wrapper\" >\r\n\r\n                            <div class=\"box\">\r\n                                            <div class=\"nummber\"> \r\n                            \r\n                        <\/div>\r\n                        \r\n                                            <h2 class=\"headline\">Size of furnace\r\n<\/h2>\r\n                                \r\n                <\/div>\r\n            \r\n                <div class=\"content-box texteditor\" style=\"\">                    \r\n                    <p><div class=\"page\" title=\"Page 5\">\n<div class=\"layoutArea\">\n<div class=\"column\">\n<p class=\" translation-block\">At H\u00e4rtha, the systems listed below are available for stress-free annealing:\u00a0<br>\n\u00a0<br>\nConvection system: \u00d8 1010 x 1000 mm\u00a0<br>\nProtective gas\/vacuum system: 1200 x 1500 x 800 mm<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/p>\r\n                    <div class=\"acf-innerblocks-container\"><\/div>\r\n                    \r\n                    <style>\r\n                        .sonder-zeichen{\r\n                            display: flex;\r\n                            flex-direction: row;\r\n                            gap: 15px;\r\n                        }\r\n                        .zeichen{\r\n                            color: #C9C9C9;\r\n                            position: relative;\r\n                            line-height: 66px;\r\n                            font-size: clamp(2.75rem, 1.9766rem + 2.1484vw, 4.125rem);\r\n                        }\r\n                    <\/style>\r\n                    \r\n                <\/div>\r\n            <\/div>\r\n        <\/div>\r\n    <\/div>\r\n<\/div>\r\n\r\n\r\n\r\n\r\n\n\n\r\n<div id=\"verfahren-text-block_ef2311378fa9fd041cc9295094ec195a\" class=\"verfahren-text toc\" data-toctitle=\"Verfahrensstandorte\" style=\"\">\r\n    <div class=\"row\">\r\n        <div class=\"col-12\">\r\n            <div class=\"content-wrapper\" >\r\n\r\n                            <div class=\"box\">\r\n                                            <div class=\"nummber\"> \r\n                            \r\n                        <\/div>\r\n                        \r\n                                            <h2 class=\"headline\">Process locations\r\n<\/h2>\r\n                                \r\n                <\/div>\r\n            \r\n                <div class=\"content-box texteditor\" style=\"\">                    \r\n                    <p><div class=\"page\" title=\"Page 5\">\n<div class=\"layoutArea\">\n<div class=\"column\">\n<p class=\" translation-block\">Refer to our <a href=\"https:\/\/haertha.de\/en\/standorte\/\" target=\"_self\">location overview <\/a> to find out which H\u00e4rtha sites offer stress-free annealing.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<p><span style=\"font-weight: 300;\">\u00a0<\/span><\/p>\n<\/p>\r\n                    <div class=\"acf-innerblocks-container\"><\/div>\r\n                    \r\n                    <style>\r\n                        .sonder-zeichen{\r\n                            display: flex;\r\n                            flex-direction: row;\r\n                            gap: 15px;\r\n                        }\r\n                        .zeichen{\r\n                            color: #C9C9C9;\r\n                            position: relative;\r\n                            line-height: 66px;\r\n                            font-size: clamp(2.75rem, 1.9766rem + 2.1484vw, 4.125rem);\r\n                        }\r\n                    <\/style>\r\n                    \r\n                <\/div>\r\n            <\/div>\r\n        <\/div>\r\n    <\/div>\r\n<\/div>","protected":false},"excerpt":{"rendered":"","protected":false},"author":9,"featured_media":1360,"menu_order":401,"template":"","verfahrenstechnik":[9],"class_list":["post-510","verfahren","type-verfahren","status-publish","has-post-thumbnail","hentry","verfahrenstechnik-gluehen"],"acf":{"text_cta":"Spannungsarmgl\u00fchen ist eine W\u00e4rmbehandlung zur Metallbearbeitung. Es dient dem <b>Abbau von Spannungen, <\/b> die beispielsweise durch Kaltverformung, Schwei\u00dfen oder ungleichm\u00e4\u00dfige Abk\u00fchlung ins Gef\u00fcge gelangt sind. Somit wird das Risiko von Verzug und Bruch beim sp\u00e4teren Verwendungszweck des Bauteils reduziert. Das Verfahren setzt sich zusammen aus der Anw\u00e4rmzeit, der Haltezeit und der Abk\u00fchlzeit.\r\n\r\nBei H\u00e4rtha garantieren wir dank jahrzehntelanger Expertise und moderner Anlagen h\u00f6chste Kundenzufriedenheit. Verlassen Sie sich auch bei kurzfristigen Anfragen auf schnelle Durchlaufzeiten und unser Qualit\u00e4tsversprechen.\r\n","contact_location":[12,49,254,244,260,248,252,256,250,9859,11495,12944],"materials":"on","tablepress":null},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Spannungsarmgl\u00fchen | H\u00c4RTHA GROUP<\/title>\n<meta name=\"description\" content=\"Spannungsarmgl\u00fchen: Definition \u2713 Verfahren und Vorteile \u2713 Anwendungsbereiche und geeignete Werkstoffe.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/haertha.de\/en\/process\/stress-free-annealing\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Spannungsarmgl\u00fchen | H\u00c4RTHA GROUP\" \/>\n<meta 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