{"id":21250,"date":"2026-10-08T02:50:50","date_gmt":"2026-10-07T18:50:50","guid":{"rendered":"https:\/\/aobosteel.com\/?page_id=21250"},"modified":"2026-10-10T18:35:37","modified_gmt":"2026-10-10T10:35:37","slug":"cycle-annealing-tool-steel","status":"publish","type":"page","link":"https:\/\/aobosteel.com\/pt\/cycle-annealing-tool-steel\/","title":{"rendered":"Recozimento c\u00edclico dos a\u00e7os ferramenta O1, A2, A6 e D2"},"content":{"rendered":"\n<style>\n\n:root{\n    --aobo-accent:#2563eb; --aobo-accent-dark:#1e1e2e; --aobo-blue:#0c56d0; --aobo-blue-dark:#073b91;\n    --aobo-text:#333; --aobo-muted:#888; --aobo-border:#e5e7eb; --aobo-border-dark:#ddd;\n    --aobo-stripe:#f7f7f9; --aobo-hover:#e8f0fe; --aobo-radius:8px; --aobo-radius-sm:6px;\n    --aobo-orange:#f59e0b; --aobo-fill:#e9ecef;\n  }\n  *{box-sizing:border-box;}\n  html{-webkit-text-size-adjust:100%;}\n  body{margin:0;background:#fff;color:var(--aobo-text);\n    font-family:-apple-system,BlinkMacSystemFont,\"Segoe 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p,.entry-content[class] li{font-size: 16px !important}.entry-content[class] table th,.entry-content[class] table td{font-size: 14px !important;padding: 11px 12px !important}.entry-content[class] .aobo-hero{padding: 30px 22px}.entry-content[class] .aobo-final-cta{padding: 26px 22px}.entry-content[class] .aobo-final-cta .aobo-btn{width: 100%}}\n<\/style>\n<section class=\"aobo-ht-ref ts-props\">\n<div class=\"aobo-wrap\">\n\n<div class=\"ts-hero\">\n<div class=\"ts-hero-top\">\n<div class=\"ts-kicker\"><span><\/span>Tool Steel | Annealing | Cycle Schedules<\/div>\n<h1 style=\"--h1-max:38px\">Cycle Annealing of O1, A2, A6 and D2 Tool Steels<\/h1>\n<p>Cycle annealing replaces a single long soak with a series of stepped holds, so the load spends less total time in the furnace for the same softened structure. The published schedules for four cold work grades are below, together with the stress relieving treatment that goes with them.<\/p>\n<\/div>\n<\/div>\n\n<div class=\"ts-tool-area\">\n\n<h2 class=\"ts-h2\">How the cycle differs from a conventional anneal<\/h2>\n<p class=\"ts-p\">A conventional anneal heats the load through the critical range and then cools it slowly enough, usually in the furnace, that the structure comes down to lamellar pearlite and spheroidized carbides. That is a slow cooling path by definition, and the furnace is occupied for the whole of it.<\/p>\n<p class=\"ts-p\">A cycle anneal splits the same job into two holds. The load is heated above the upper critical temperature for its grade, held long enough to dissolve the carbides, then brought down to a temperature just below the lower critical and held there for the transformation, and finally air cooled. The transformation happens during the second hold rather than during a long furnace cool, which is where the time saving comes from.<\/p>\n\n\n<p class=\"ts-p\">What the cycle is buying is a spheroidized structure, and that structure is worth recognising on a micrograph. The two plates below are soft-annealed carbides in a ferritic matrix.<\/p>\n<figure class=\"ts-fig\"><img src=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/10\/Aobo-Steel-Tool-Steel-Cycle-Annealing-totten-fig-6-71-spheroidized-carbides.jpg\" alt=\"Micrographs of a medium-carbon low-alloy steel and a high-speed steel after soft annealing, showing spheroidized carbides in a ferritic matrix\" width=\"1400\" height=\"584\" loading=\"lazy\" decoding=\"async\"><figcaption>Fig. 6.71. Structure after soft annealing, 500x: (a) a medium-carbon low-alloy steel, DIN 50CrMoV4, annealed at 720 to 740 &#176;C, and (b) a high-speed steel annealed at 820 &#176;C. In both, the lamellar cementite of the as-rolled structure has broken up into globular carbides in ferrite, which is the softest and most machinable condition for a tool steel. Plate (b) is the same change in a high-alloy grade, where the carbide content is much higher and the anneal is correspondingly more critical. Source: B. Li\u0161\u010di\u0107, Steel Heat Treatment, in Steel Heat Treatment: Metallurgy and Technologies (G.E. Totten, ed.), CRC Press, 2006, Fig. 6.71.<\/figcaption><\/figure>\n<h2 class=\"ts-h2\">Cycle annealing treatments for four tool steel grades<\/h2>\n<p class=\"ts-p\">The table gives the published treatment for each grade, with the hold times counted from the moment the load reaches the temperature. The same source notes that the second hold is what produces the softened structure, and that the air cool that follows is a normal part of the cycle rather than an interruption.<\/p>\n<div class=\"ts-table-wrap\">\n<table class=\"ts-table\">\n<thead><tr><th style=\"width:16%\">Grade<\/th><th style=\"width:84%\">Treatment<\/th><\/tr><\/thead>\n<tbody>\n<tr><td>O1<\/td><td>Heat to 730 &deg;C (1350 &deg;F), hold 4 h; heat to 780 &deg;C (1440 &deg;F), hold 2 h; cool to 690 &deg;C (1275 &deg;F), hold 6 h; air cool<\/td><\/tr>\n<tr><td>A2<\/td><td>Heat to 900 &deg;C (1650 &deg;F), hold 2 h; cool to 760 &deg;C (1400 &deg;F), hold 6 h; air cool<\/td><\/tr>\n<tr><td>A6<\/td><td>Heat to 815 &deg;C (1500 &deg;F), hold 2 h; cool to 650 &deg;C (1200 &deg;F), hold 6 h; air cool<\/td><\/tr>\n<tr><td>D2<\/td><td>Heat to 900 &deg;C (1650 &deg;F), hold 2 h; cool to 775 &deg;C (1425 &deg;F), hold 6 h; air cool<\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p class=\"ts-tcap\"><em>Cycle annealing treatments published for four tool steel grades. Each hold is timed from the moment the load reaches the temperature. Source, Table 5 of Heat Treating of Tool Steels, in ASM Handbook, Volume 4, Heat Treating.<\/em><\/p>\n<div class=\"ts-dl\"><div class=\"ts-dl-txt\"><strong>Cycle annealing schedules, printable PDF<\/strong> The schedules for O1, A2, A6 and D2 with the stress relieving treatment, in one PDF with our contact details.<\/div> <a class=\"ts-dl-btn\" href=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/10\/Aobo-Steel-Cycle-Annealing.pdf\" download> <svg viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M12 3v12m0 0 4.5-4.5M12 15l-4.5-4.5M4 20h16\"\/><\/svg> Download PDF <\/a><\/div>\n\n\n<p class=\"ts-p\">That change from a lamellar to a globular carbide is a change of shape, not of composition, and it runs through a fixed sequence.<\/p>\n<figure class=\"ts-fig\"><img src=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/10\/Aobo-Steel-Tool-Steel-Cycle-Annealing-totten-fig-6-73-lamella-to-spheroids.jpg\" alt=\"Schematic of the change from cementite lamellae to spheroids during soft annealing, drawn as five stages\" width=\"734\" height=\"582\" loading=\"lazy\" decoding=\"async\"><figcaption>Fig. 6.73. How cementite lamellae become spheroids during soft annealing, drawn as five stages. A lamella first breaks at its ends into a knucklebone shape, the fragments then spheroidize, and the smaller ones dissolve while the larger ones grow. Diffusion does the work, which is why the transformation hold of a cycle anneal is timed in hours rather than minutes. Source: B. Li\u0161\u010di\u0107, Steel Heat Treatment, in Steel Heat Treatment: Metallurgy and Technologies (G.E. Totten, ed.), CRC Press, 2006, Fig. 6.73.<\/figcaption><\/figure>\n<h2 class=\"ts-h2\">When the cycle is worth the time<\/h2>\n<p class=\"ts-p\">For a large furnace load the published guidance is that the cycle offers little advantage, because the load itself sets the heating and cooling times. For individual tools that can be handled in a salt bath or a conventional furnace, the same source describes the saving in time as substantial.<\/p>\n<p class=\"ts-p\">The O1 schedule is the one that shows the pattern most clearly. It is heated to 730 &deg;C (1350 &deg;F) and held for 4 h, raised to 780 &deg;C (1440 &deg;F) and held for 2 h, brought down to 690 &deg;C (1275 &deg;F) and held for 6 h, and then air cooled. The other three grades in the table go straight from the high hold to the transformation hold.<\/p>\n\n\n<p class=\"ts-p\">Where the holds are placed is set by the iron-carbon diagram, and the window narrows as the carbon rises.<\/p>\n<figure class=\"ts-fig\"><img src=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/10\/Aobo-Steel-Tool-Steel-Cycle-Annealing-totten-fig-6-74-soft-annealing-temperature-range.jpg\" alt=\"Temperature range for soft annealing of unalloyed steels with 0.6 to 1.35% carbon, shown on the iron-carbon diagram\" width=\"1400\" height=\"623\" loading=\"lazy\" decoding=\"async\"><figcaption>Fig. 6.74. The temperature range for soft annealing of unalloyed steels, 0.6 to 1.35% C, drawn against the iron-carbon diagram. The band sits just below the A1 line, and it moves and widens with the carbon content because a hypereutectoid steel carries more cementite to spheroidize. The alloyed tool grades are held a little higher still, which is where the cycle anneal holds come from. Source: B. Li\u0161\u010di\u0107, Steel Heat Treatment, in Steel Heat Treatment: Metallurgy and Technologies (G.E. Totten, ed.), CRC Press, 2006, Fig. 6.74.<\/figcaption><\/figure>\n<h2 class=\"ts-h2\">Stress relieving before final hardening<\/h2>\n<p class=\"ts-p\">Stress relieving a finished tool before final hardening does not noticeably reduce distortion in most cases. Where dimensional accuracy after hardening is critical, the published order is to rough machine, stress relieve, and then take the final light cut.<\/p>\n<p class=\"ts-p\">The recommended treatment is a heat to 650 to 675 &deg;C (1200 to 1250 &deg;F), a hold of 1 h per 25 mm (1 in.) of thickness, and an air cool. Preheating the O grades before austenitizing reduces distortion, and is almost always required when the tool is to be austenitized in a liquid bath.<\/p>\n\n<h2 class=\"ts-h2\">Annealed stock and what to order<\/h2>\n<p class=\"ts-p\">Tool steel is bought in the annealed condition, and the annealed structure is what makes the rough machining possible. The annealing and normalizing temperatures for the full range of grades are listed <a href=\"https:\/\/aobosteel.com\/tool-steel-annealing-normalizing-temperature-chart\/\">on the annealing and normalizing temperature chart<\/a>, which covers the carbon, cold work, hot work and high speed groups.<\/p>\n<p class=\"ts-p\">For the grades in the table, <a href=\"https:\/\/aobosteel.com\/o1-tool-steel\/\">the O1 tool steel page<\/a> carries the supply condition and the annealed delivery range, and <a href=\"https:\/\/aobosteel.com\/a2-tool-steel\/\">the A2 tool steel page<\/a> carries the same details for that grade. The D2 sizes and conditions follow the same pattern.<\/p>\n<p class=\"ts-p\">Cycle annealing is a heat treater decision rather than a purchase specification. It does not appear on the steel order, but it decides how long the tool spends in the furnace and how much distortion comes back with it.<\/p>\n\n<div class=\"ts-dl\"><div class=\"ts-dl-txt\"><strong>Cycle annealing schedules, printable PDF<\/strong> The schedules for O1, A2, A6 and D2 with the stress relieving treatment, in one PDF with our contact details.<\/div> <a class=\"ts-dl-btn\" href=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/10\/Aobo-Steel-Cycle-Annealing.pdf\" download> <svg viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M12 3v12m0 0 4.5-4.5M12 15l-4.5-4.5M4 20h16\"\/><\/svg> Download PDF <\/a><\/div>\n\n<div class=\"ts-disclaimer\">\n<h3>Before you use these values<\/h3>\n<p>This page is a reference summary of published practice and it is not an Aobo Steel specification. The schedules are the published treatments for the grades named, and a different furnace, a different load weight or a different section size will move the hold times. Final cycle parameters are set by the heat treater.<\/p>\n<\/div>\n\n<p class=\"ts-source\">Source: ASM Handbook, Volume 4, Heat Treating, ASM International, 1991.<\/p>\n\n<\/div><\/div><\/section>\n","protected":false},"excerpt":{"rendered":"<p>Tool Steel | Annealing | Cycle Schedules Cycle Annealing of O1, A2, A6 and D2 Tool Steels Cycle annealing replaces a single long soak with a series of stepped holds, so the load spends less total time in the furnace for the same softened structure. The published schedules for four cold work grades are below, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center 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