{"id":49306,"date":"2026-05-19T10:00:03","date_gmt":"2026-05-19T08:00:03","guid":{"rendered":"https:\/\/www.bonomiacciai.it\/?p=49306"},"modified":"2026-05-06T12:11:50","modified_gmt":"2026-05-06T10:11:50","slug":"spheroidized-annealing-steel","status":"publish","type":"post","link":"https:\/\/www.bonomiacciai.it\/en\/spheroidized-annealing-steel\/","title":{"rendered":"Spheroidized annealing steel: why it improves machinability"},"content":{"rendered":"<div class=\"wpb-content-wrapper\" id=\"wpb-content-root\">[vc_row][vc_column][vc_column_text css=&#8221;&#8221;]After analyzing the normalized and annealed condition, we now explore another fundamental condition for many steels: spheroidized annealing, also known as spheroidization annealing.<\/p>\n<p>This supply condition is particularly used for high carbon steels and tool steels, where machinability and preparation for subsequent treatments are critical aspects.<\/p>\n<p>\ud83d\udc49 The main objective is to modify the internal structure of the steel to improve its behavior during machining.[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_single_image image=&#8221;49299&#8243; add_caption=&#8221;yes&#8221; style=&#8221;vc_box_shadow&#8221; onclick=&#8221;img_link_large&#8221; css=&#8221;.vc_custom_1777971090368{border-radius: 15px !important;}&#8221;][\/vc_column][\/vc_row][vc_row][vc_column el_class=&#8221;ba-box&#8221;][vc_custom_heading text=&#8221;\ud83d\udd0dWhat is spheroidized annealing&#8221; font_container=&#8221;tag:h3|text_align:left&#8221; use_theme_fonts=&#8221;yes&#8221; css=&#8221;&#8221;][vc_empty_space height=&#8221;16px&#8221;][vc_column_text css=&#8221;&#8221;]Spheroidized annealing is a heat treatment that transforms the morphology of carbides present in the steel microstructure.<\/p>\n<p>\ud83d\udc49 In particular:<\/p>\n<ul>\n<li>lamellar carbides (typical of pearlite)<\/li>\n<li>transform into spheroidal particles<\/li>\n<\/ul>\n<p>This change has a direct impact on the material properties.[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column el_class=&#8221;ba-box&#8221;][vc_custom_heading text=&#8221;\ud83d\udd27 How spheroidization is achieved&#8221; use_theme_fonts=&#8221;yes&#8221; css=&#8221;&#8221;][vc_column_text css=&#8221;&#8221;]The spheroidized annealing process is carried out by:<\/p>\n<ul>\n<li>holding the material at a controlled temperature (generally between 680 \u00b0C and 750 \u00b0C) for an extended period<\/li>\n<\/ul>\n<p>\ud83d\udc49 Under these conditions:<\/p>\n<ul>\n<li>carbides reorganize<\/li>\n<li>the structure becomes more uniform<\/li>\n<li>hardness is reduced<\/li>\n<\/ul>\n<p>\u2714 Time and temperature are key parameters to achieve the correct result.[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column el_class=&#8221;ba-box&#8221;][vc_custom_heading text=&#8221;\ud83d\udd2c Microstructure: spheroidal carbides&#8221; font_container=&#8221;tag:h3|text_align:left&#8221; use_theme_fonts=&#8221;yes&#8221; css=&#8221;&#8221;][vc_empty_space height=&#8221;16px&#8221;][vc_column_text css=&#8221;&#8221;]From a metallurgical point of view, spheroidized annealing leads to the formation of:<\/p>\n<ul>\n<li>ferritic matrix<\/li>\n<li>dispersed spheroidal carbides<\/li>\n<\/ul>\n<p>\ud83d\udc49 This microstructure is very different from lamellar pearlite.<\/p>\n<p>\u2714 Result:<\/p>\n<ul>\n<li>\u201csofter\u201d structure<\/li>\n<li>lower cutting resistance<\/li>\n<li>greater homogeneity<\/li>\n<\/ul>\n[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column el_class=&#8221;ba-box&#8221;][vc_custom_heading text=&#8221;\ud83e\udde0 Advantages of spheroidized annealing&#8221; font_container=&#8221;tag:h3|text_align:left&#8221; use_theme_fonts=&#8221;yes&#8221; css=&#8221;&#8221;][vc_empty_space height=&#8221;16px&#8221;][vc_column_text css=&#8221;&#8221;]Spheroidized annealing offers several operational advantages:<\/p>\n<p>\u2714 significant reduction in hardness<br \/>\n\u2714 improved machinability on machine tools<br \/>\n\u2714 reduced wear of cutting tools<br \/>\n\u2714 greater uniformity in subsequent heat treatments<\/p>\n<p>\ud83d\udc49 This makes the material easier to machine and more controllable in the following stages.[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column el_class=&#8221;ba-box&#8221;][vc_custom_heading text=&#8221;\u2699\ufe0f When it is used&#8221; font_container=&#8221;tag:h3|text_align:left&#8221; use_theme_fonts=&#8221;yes&#8221; css=&#8221;&#8221;][vc_empty_space height=&#8221;16px&#8221;][vc_column_text css=&#8221;&#8221;]This supply condition is particularly suitable for steels that must be:<\/p>\n<ul>\n<li>intensively machined<\/li>\n<li>subjected to quenching and tempering<\/li>\n<li>used for tools<\/li>\n<\/ul>\n<p>\ud83d\udc49 In practice:<br \/>\nit is the ideal condition before complex machining operations.[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column el_class=&#8221;ba-box&#8221;][vc_custom_heading text=&#8221;\ud83d\udd04 Connection to the series&#8221; font_container=&#8221;tag:h3|text_align:left&#8221; use_theme_fonts=&#8221;yes&#8221; css=&#8221;&#8221;][vc_empty_space height=&#8221;16px&#8221;][vc_column_text css=&#8221;&#8221;]<span style=\"font-weight: 400;\">Spheroidized annealing represents a fundamental step in understanding how the microstructure directly affects the machinability of steel.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\ud83d\udc49<\/span><span style=\"font-weight: 400;\"> In the next articles we will analyze:<\/span><\/p>\n<ul>\n<li><span style=\"font-weight: 400;\">quenched and tempered condition <\/span><\/li>\n<li><span style=\"font-weight: 400;\">solution treated condition<\/span><\/li>\n<li><span style=\"font-weight: 400;\">aged condition<\/span><\/li>\n<li><span style=\"font-weight: 400;\">mechanical properties <\/span><\/li>\n<li><span style=\"font-weight: 400;\">inspections and verifications <\/span><\/li>\n<li style=\"list-style-type: none;\"><\/li>\n<\/ul>\n[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column el_class=&#8221;ba-box&#8221;][vc_custom_heading text=&#8221;\ud83c\udfaf Conclusion&#8221; font_container=&#8221;tag:h3|text_align:left&#8221; use_theme_fonts=&#8221;yes&#8221; css=&#8221;&#8221;][vc_empty_space height=&#8221;16px&#8221;][vc_column_text css=&#8221;&#8221;]The supply condition of steel represents one of the key elements to truly understand its quality.<\/p>\n<p>\ud83d\udc49 It is not just a delivery condition: it is the result of treatments that define the material\u2019s behavior.<\/p>\n<p>Understanding it means going beyond the certificate and truly understanding steel.[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_empty_space][\/vc_column][\/vc_row][vc_row full_width=&#8221;stretch_row&#8221; css=&#8221;.vc_custom_1775557578713{background-color: #ebebeb !important;}&#8221; visibility=&#8221;hidden-phone&#8221;][vc_column]<div class=\"vcex-spacing wpex-w-100 wpex-clear\" style=\"height:35px;\"><\/div>[vc_column_text css=&#8221;&#8221;]\n<p>Do you want to learn more about how steel inspections and controls are managed?<br \/>\nContact us to speak with our technical department.<br \/>\nOr fill out the form below to receive more information.<\/p>\n[\/vc_column_text]<div class=\"vcex-spacing wpex-w-100 wpex-clear\" style=\"height:35px;\"><\/div>[vc_row_inner][vc_column_inner width=&#8221;1\/2&#8243;][vc_custom_heading text=&#8221;Contact our technical office:&#8221; font_container=&#8221;tag:h2|font_size:26px|text_align:center|color:%23172028&#8243; use_theme_fonts=&#8221;yes&#8221; css=&#8221;&#8221;][\/vc_column_inner][vc_column_inner width=&#8221;1\/2&#8243;][vc_custom_heading text=&#8221;Compila il form:&#8221; font_container=&#8221;tag:h2|font_size:26px|text_align:center|color:%23172028&#8243; use_theme_fonts=&#8221;yes&#8221;]<div class=\"vcex-spacing wpex-w-100 wpex-clear\" style=\"height:24px;\"><\/div>[\/vc_column_inner][\/vc_row_inner][vc_row_inner gap=&#8221;35&#8243; css=&#8221;.vc_custom_1775557630564{margin-right: -10px !important;margin-left: -10px !important;border-right-width: -10px !important;border-left-width: -10px !important;padding-right: -10px !important;padding-left: -10px !important;}&#8221;][vc_column_inner width=&#8221;1\/2&#8243;][vc_single_image image=&#8221;48019&#8243; img_size=&#8221;1080&#215;1080&#8243; alignment=&#8221;center&#8221; css=&#8221;&#8221;]<div class=\"vcex-spacing wpex-w-100 wpex-clear\" style=\"height:35px;\"><\/div>[vc_custom_heading text=&#8221;Gianluigi Vianelli&#8221; font_container=&#8221;tag:h2|font_size:26px|text_align:center|color:%23282828&#8243; google_fonts=&#8221;font_family:Arimo%3Aregular%2Citalic%2C700%2C700italic|font_style:700%20bold%20regular%3A700%3Anormal&#8221; css_animation=&#8221;none&#8221; css=&#8221;&#8221;][vc_custom_heading text=&#8221;Research &amp; Development Lab Manager&#8221; font_container=&#8221;tag:h2|font_size:19px|text_align:center|color:%23282828&#8243; google_fonts=&#8221;font_family:Arimo%3Aregular%2Citalic%2C700%2C700italic|font_style:400%20regular%3A400%3Anormal&#8221; css_animation=&#8221;none&#8221; css=&#8221;&#8221;]<div class=\"vcex-module vcex-divider vcex-divider-solid vcex-divider-center wpex-mx-auto wpex-max-w-100 wpex-block wpex-h-0 wpex-border-b wpex-border-solid wpex-border-main\" style=\"width:250px;margin-block:15px;border-color:#282828;\"><\/div><style>.vcex-social-links.vcex_6accbc262b744{font-size:20px;}.vcex-social-links.vcex_6accbc262b744 .vcex-social-links__item{color:#282828;}.vcex-social-links.vcex_6accbc262b744 .vcex-social-links__item:hover{color:#4a6670;}<\/style><div class=\"vcex-social-links vcex-module wpex-flex wpex-flex-wrap wpex-gap-5 wpex-social-btns vcex-social-btns wpex-items-center wpex-justify-center wpex-last-mr-0 vcex_6accbc262b744\"><a href=\"mailto:g&#046;&#118;i&#097;n&#101;&#108;li&#064;&#098;&#111;n&#111;m&#105;acci&#097;i.&#105;t\" class=\"vcex-social-links__item wpex-social-btn wpex-social-btn-no-style wpex-has-custom-color wpex-email\"><span class=\"vcex-social-links__icon wpex-icon\" aria-hidden=\"true\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 512 512\"><path d=\"M48 64C21.5 64 0 85.5 0 112c0 15.1 7.1 29.3 19.2 38.4L236.8 313.6c11.4 8.5 27 8.5 38.4 0L492.8 150.4c12.1-9.1 19.2-23.3 19.2-38.4c0-26.5-21.5-48-48-48H48zM0 176V384c0 35.3 28.7 64 64 64H448c35.3 0 64-28.7 64-64V176L294.4 339.2c-22.8 17.1-54 17.1-76.8 0L0 176z\"\/><\/svg><\/span><span class=\"screen-reader-text\">Email<\/span><\/a><a href=\"https:\/\/www.linkedin.com\/in\/gianluigi-vianelli-17539598\/\" class=\"vcex-social-links__item wpex-social-btn wpex-social-btn-no-style wpex-has-custom-color wpex-linkedin\"><span class=\"vcex-social-links__icon wpex-icon\" aria-hidden=\"true\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 448 512\"><path d=\"M100.3 448H7.4V148.9h92.9zM53.8 108.1C24.1 108.1 0 83.5 0 53.8a53.8 53.8 0 0 1 107.6 0c0 29.7-24.1 54.3-53.8 54.3zM447.9 448h-92.7V302.4c0-34.7-.7-79.2-48.3-79.2-48.3 0-55.7 37.7-55.7 76.7V448h-92.8V148.9h89.1v40.8h1.3c12.4-23.5 42.7-48.3 87.9-48.3 94 0 111.3 61.9 111.3 142.3V448z\"\/><\/svg><\/span><span class=\"screen-reader-text\">LinkedIn<\/span><\/a><\/div>[\/vc_column_inner][vc_column_inner width=&#8221;1\/2&#8243;]\n<div class=\"wpcf7 no-js\" id=\"wpcf7-f44579-o1\" lang=\"it-IT\" dir=\"ltr\" data-wpcf7-id=\"44579\">\n<div class=\"screen-reader-response\"><p role=\"status\" aria-live=\"polite\" aria-atomic=\"true\"><\/p> <ul><\/ul><\/div>\n<form action=\"\/en\/wp-json\/wp\/v2\/posts\/49306#wpcf7-f44579-o1\" method=\"post\" class=\"wpcf7-form init\" aria-label=\"Modulo di contatto\" novalidate=\"novalidate\" data-status=\"init\">\n<fieldset class=\"hidden-fields-container\"><input type=\"hidden\" name=\"_wpcf7\" value=\"44579\" \/><input type=\"hidden\" name=\"_wpcf7_version\" value=\"6.2.2\" \/><input type=\"hidden\" name=\"_wpcf7_locale\" value=\"it_IT\" \/><input type=\"hidden\" name=\"_wpcf7_unit_tag\" value=\"wpcf7-f44579-o1\" \/><input type=\"hidden\" name=\"_wpcf7_container_post\" value=\"0\" \/><input type=\"hidden\" name=\"_wpcf7_posted_data_hash\" value=\"\" \/>\n<\/fieldset>\n<style>\n.contact-form-wrapper {\n background: white; \/* Sfondo del modulo *\/\n padding: 20px;\n border-radius: 10px;\n box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);\n max-width: 600px;\n margin: 0 auto;\n box-sizing: border-box;\n color: black; \/* Colore del testo *\/\n}\n\n.contact-form-wrapper .form-row {\n display: flex;\n flex-wrap: wrap;\n margin-bottom: 5px; \/* Spazio ridotto tra le righe *\/\n}\n\n.contact-form-wrapper .form-column {\n flex: 1;\n padding: 0 10px;\n}\n\n.contact-form-wrapper .form-column-full {\n flex: 0 0 100%;\n padding: 0 10px;\n}\n\n.contact-form-wrapper .form-column label,\n.contact-form-wrapper .form-column-full label {\n display: block;\n margin-bottom: 5px; \/* Spazio ridotto tra etichetta e campo di input *\/\n}\n\n.contact-form-wrapper input[type=\"text\"],\n.contact-form-wrapper input[type=\"email\"],\n.contact-form-wrapper input[type=\"tel\"],\n.contact-form-wrapper textarea {\n width: 100%;\n padding: 10px;\n border-radius: 5px;\n border: none;\n background: darkgray; \/* Sfondo dei campi *\/\n color: white; \/* Colore del testo nei campi *\/\n box-sizing: border-box;\n}\n\n.contact-form-wrapper textarea {\n height: 100px;\n}\n\n.contact-form-wrapper p {\n margin: 5px 0; \/* Spazio ridotto tra i paragrafi *\/\n}\n\n.contact-form-wrapper .submit-row {\n display: flex;\n justify-content: center;\n padding: 0 10px;\n}\n\n.contact-form-wrapper input[type=\"submit\"] {\n width: 100%;\n background: black;\n color: white;\n padding: 10px 20px;\n font-size: 16px;\n border: none;\n border-radius: 10px;\n cursor: pointer;\n box-sizing: border-box;\n}\n\n.contact-form-wrapper input[type=\"submit\"]:hover {\n background: #333;\n}\n<\/style>\n<div class=\"contact-form-wrapper\">\n\t<div class=\"form-row\">\n\t\t<div class=\"form-column\">\n\t\t\t<p><label><br \/>\n<strong>Nome<\/strong><br \/>\n<span class=\"wpcf7-form-control-wrap\" data-name=\"your-name\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-text wpcf7-validates-as-required\" aria-required=\"true\" aria-invalid=\"false\" placeholder=\"Nome\" value=\"\" type=\"text\" name=\"your-name\" \/><\/span><br \/>\n<\/label>\n\t\t\t<\/p>\n\t\t<\/div>\n\t\t<div class=\"form-column\">\n\t\t\t<p><label><br \/>\n<strong>Cognome<\/strong><br \/>\n<span class=\"wpcf7-form-control-wrap\" data-name=\"your-surname\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-text wpcf7-validates-as-required\" aria-required=\"true\" aria-invalid=\"false\" placeholder=\"Cognome\" value=\"\" type=\"text\" name=\"your-surname\" \/><\/span><br \/>\n<\/label>\n\t\t\t<\/p>\n\t\t<\/div>\n\t<\/div>\n\t<div class=\"form-row\">\n\t\t<div class=\"form-column\">\n\t\t\t<p><label><br \/>\n<strong>Azienda<\/strong><br \/>\n<span class=\"wpcf7-form-control-wrap\" data-name=\"your-azienda\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-text wpcf7-validates-as-required\" aria-required=\"true\" aria-invalid=\"false\" placeholder=\"Azienda\" value=\"\" type=\"text\" name=\"your-azienda\" \/><\/span><br \/>\n<\/label>\n\t\t\t<\/p>\n\t\t<\/div>\n\t\t<div class=\"form-column\">\n\t\t\t<p><label><br \/>\n<strong>Sito Web<\/strong><br \/>\n<span class=\"wpcf7-form-control-wrap\" data-name=\"your-website\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-text\" aria-invalid=\"false\" placeholder=\"Sito Web\" value=\"\" type=\"text\" name=\"your-website\" \/><\/span><br \/>\n<\/label>\n\t\t\t<\/p>\n\t\t<\/div>\n\t<\/div>\n\t<div class=\"form-row\">\n\t\t<div class=\"form-column\">\n\t\t\t<p><label><br \/>\n<strong>Telefono<\/strong><br \/>\n<span class=\"wpcf7-form-control-wrap\" data-name=\"your-tel\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-text wpcf7-validates-as-required\" aria-required=\"true\" aria-invalid=\"false\" placeholder=\"Telefono\" value=\"\" type=\"text\" name=\"your-tel\" \/><\/span><br \/>\n<\/label>\n\t\t\t<\/p>\n\t\t<\/div>\n\t\t<div class=\"form-column\">\n\t\t\t<p><label><br \/>\n<strong>Email<\/strong><br \/>\n<span class=\"wpcf7-form-control-wrap\" data-name=\"your-email\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-email wpcf7-validates-as-required wpcf7-text wpcf7-validates-as-email\" aria-required=\"true\" aria-invalid=\"false\" placeholder=\"Email\" value=\"\" type=\"email\" name=\"your-email\" \/><\/span><br \/>\n<\/label>\n\t\t\t<\/p>\n\t\t<\/div>\n\t<\/div>\n\t<div class=\"form-row\">\n\t\t<div class=\"form-column-full\">\n\t\t\t<p><label><br \/>\n<strong>Messaggio<\/strong><br \/>\n<span class=\"wpcf7-form-control-wrap\" data-name=\"your-message\"><textarea cols=\"40\" rows=\"10\" maxlength=\"2000\" class=\"wpcf7-form-control wpcf7-textarea wpcf7-validates-as-required\" aria-required=\"true\" aria-invalid=\"false\" placeholder=\"Messaggio\" name=\"your-message\"><\/textarea><\/span><br \/>\n<\/label>\n\t\t\t<\/p>\n\t\t<\/div>\n\t<\/div>\n\t<div class=\"form-row\">\n\t\t<p><label><br \/>\n<\/label>\n\t\t<\/p>\n\t\t<p><span class=\"wpcf7-form-control-wrap\" data-name=\"checkbox-713\"><span class=\"wpcf7-form-control wpcf7-checkbox wpcf7-validates-as-required\"><span class=\"wpcf7-list-item first last\"><input type=\"checkbox\" name=\"checkbox-713[]\" value=\"Accetto la Privacy Policy\" \/><span class=\"wpcf7-list-item-label\">Accetto la Privacy Policy<\/span><\/span><\/span><\/span><a href=\"https:\/\/www.iubenda.com\/privacy-policy\/38826225\" rel=\"noopener\" target=\"_blank\">Leggi qui<\/a>\n\t\t<\/p>\n\t<\/div>\n\t<div class=\"form-row submit-row\">\n\t\t<p><input class=\"wpcf7-form-control wpcf7-submit has-spinner\" type=\"submit\" value=\"INVIA!\" \/>\n\t\t<\/p>\n\t<\/div>\n<\/div><div class=\"wpcf7-response-output\" aria-hidden=\"true\"><\/div>\n<\/form>\n<\/div>\n[\/vc_column_inner][\/vc_row_inner][\/vc_column][\/vc_row][vc_row full_width=&#8221;stretch_row_content&#8221; css=&#8221;.vc_custom_1717678552691{background-color: #ebebeb !important;}&#8221; visibility=&#8221;visible-phone&#8221;][\/vc_row][vc_column][\/vc_column]<div class=\"vcex-spacing wpex-w-100 wpex-clear\" style=\"height:35px;\"><\/div>[vc_column_text css=&#8221;&#8221;]\n<p>I am text block. Click edit button to change this text. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut elit tellus, luctus nec ullamcorper mattis, pulvinar dapibus leo.<\/p>\n[\/vc_column_text]\n<\/div>","protected":false},"excerpt":{"rendered":"<p>[vc_row][vc_column][vc_column_text css=&#8221;&#8221;]After analyzing the normalized and annealed condition, we now explore another fundamental condition for many steels: spheroidized annealing, also known as spheroidization annealing. This supply condition is particularly used for high carbon steels and tool steels, where machinability and preparation for subsequent treatments are critical aspects. \ud83d\udc49 The main objective is to modify the&hellip;<\/p>\n","protected":false},"author":1,"featured_media":49351,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2175,2176,1720],"tags":[3082,2947,3100,1694,3083,1919,3094,3097,3096,3099,3084,3013,3085,2143,3086,3087,3088,3095,3092,3091,3093,3089,2155,2655,3098,3020,3090,2153,3016],"post_series":[],"class_list":["post-49306","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog-en","category-home-en","category-technical-contents","tag-acciai-alto-carbonio","tag-acciai-per-utensili","tag-annealed-condition","tag-bonomi-acciai-en","tag-carburi-sferoidali","tag-durezza-acciaio","tag-heat-treatment-of-steel","tag-high-carbon-steels","tag-lamellar-pearlite","tag-machining-processes","tag-metallurgia-acciaio","tag-microstruttura-acciaio","tag-perlite-lamellare","tag-quenching-and-tempering","tag-ricottura-di-sferoidizzazione","tag-ricottura-globulare","tag-sferoidizzazione-acciaio","tag-spheroidal-carbides","tag-spheroidization-annealing","tag-spheroidized-annealing","tag-spheroidized-steel","tag-stato-ricotto","tag-steel-hardness","tag-steel-machinability","tag-steel-metallurgy","tag-steel-microstructure","tag-tempra-e-rinvenimento","tag-tool-steels","tag-trattamenti-termici-acciaio","entry","has-media"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.8 (Yoast SEO v28.6) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Spheroidized annealing steel: why it improves machinability<\/title>\n<meta name=\"description\" content=\"Discover what spheroidized annealing (spheroidization) of steel is: process, microstructure, and advantages.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.bonomiacciai.it\/?p=49300\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Spheroidized annealing steel: why it improves machinability\" \/>\n<meta property=\"og:description\" content=\"Discover what spheroidized annealing (spheroidization) of steel is: process, microstructure, and advantages.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.bonomiacciai.it\/?p=49300\" \/>\n<meta property=\"og:site_name\" content=\"Bonomi Acciai\" \/>\n<meta property=\"article:published_time\" content=\"2026-05-19T08:00:03+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.bonomiacciai.it\/wp-content\/uploads\/2026\/05\/Stato-di-fornitura3_Blog.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1080\" \/>\n\t<meta property=\"og:image:height\" content=\"1080\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.bonomiacciai.it\\\/?p=49300#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.bonomiacciai.it\\\/?p=49300\"},\"author\":{\"name\":\"admin\",\"@id\":\"https:\\\/\\\/www.bonomiacciai.it\\\/#\\\/schema\\\/person\\\/6a78aa2ff06547ab3b8ec2448c4fe802\"},\"headline\":\"Spheroidized annealing steel: why it improves machinability\",\"datePublished\":\"2026-05-19T08:00:03+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.bonomiacciai.it\\\/?p=49300\"},\"wordCount\":1083,\"publisher\":{\"@id\":\"https:\\\/\\\/www.bonomiacciai.it\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.bonomiacciai.it\\\/?p=49300#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.bonomiacciai.it\\\/wp-content\\\/uploads\\\/2026\\\/05\\\/Stato-di-fornitura3_Blog.jpg\",\"keywords\":[\"acciai alto carbonio\",\"acciai per utensili\",\"annealed condition\",\"Bonomi Acciai\",\"carburi sferoidali\",\"durezza acciaio\",\"heat treatment of steel\",\"high carbon steels\",\"lamellar pearlite\",\"machining processes\",\"metallurgia acciaio\",\"microstruttura acciaio\",\"perlite lamellare\",\"quenching and tempering\",\"ricottura di sferoidizzazione\",\"ricottura globulare\",\"sferoidizzazione acciaio\",\"spheroidal carbides\",\"spheroidization annealing\",\"spheroidized annealing\",\"spheroidized steel\",\"stato ricotto\",\"steel hardness\",\"Steel machinability\",\"steel metallurgy\",\"steel microstructure\",\"tempra e rinvenimento\",\"tool steels\",\"trattamenti termici acciaio\"],\"articleSection\":[\"Blog\",\"Home\",\"Technical contents\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.bonomiacciai.it\\\/?p=49300\",\"url\":\"https:\\\/\\\/www.bonomiacciai.it\\\/?p=49300\",\"name\":\"Spheroidized annealing steel: why it improves machinability\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.bonomiacciai.it\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.bonomiacciai.it\\\/?p=49300#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.bonomiacciai.it\\\/?p=49300#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.bonomiacciai.it\\\/wp-content\\\/uploads\\\/2026\\\/05\\\/Stato-di-fornitura3_Blog.jpg\",\"datePublished\":\"2026-05-19T08:00:03+00:00\",\"description\":\"Discover what spheroidized annealing (spheroidization) of steel is: process, microstructure, and advantages.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.bonomiacciai.it\\\/?p=49300#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.bonomiacciai.it\\\/?p=49300\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/www.bonomiacciai.it\\\/?p=49300#primaryimage\",\"url\":\"https:\\\/\\\/www.bonomiacciai.it\\\/wp-content\\\/uploads\\\/2026\\\/05\\\/Stato-di-fornitura3_Blog.jpg\",\"contentUrl\":\"https:\\\/\\\/www.bonomiacciai.it\\\/wp-content\\\/uploads\\\/2026\\\/05\\\/Stato-di-fornitura3_Blog.jpg\",\"width\":1080,\"height\":1080,\"caption\":\"Grafica tecnica Bonomi Acciai dedicata alla ricottura globulare dell\u2019acciaio. L\u2019immagine evidenzia come questo trattamento termico migliori la lavorabilit\u00e0 del materiale, mostrando una rappresentazione della microstruttura globulare e icone relative a certificati, analisi chimiche, prove e test, microstruttura e controlli avanzati.\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.bonomiacciai.it\\\/?p=49300#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/www.bonomiacciai.it\\\/en\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Spheroidized annealing steel: why it improves machinability\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.bonomiacciai.it\\\/#website\",\"url\":\"https:\\\/\\\/www.bonomiacciai.it\\\/\",\"name\":\"Bonomi Acciai\",\"description\":\"La tua visione, il nostro acciaio.\",\"publisher\":{\"@id\":\"https:\\\/\\\/www.bonomiacciai.it\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/www.bonomiacciai.it\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/www.bonomiacciai.it\\\/#organization\",\"name\":\"Bonomi Acciai\",\"url\":\"https:\\\/\\\/www.bonomiacciai.it\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/www.bonomiacciai.it\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/www.bonomiacciai.it\\\/wp-content\\\/uploads\\\/2023\\\/08\\\/Bonomi-Acciai_Logo.png\",\"contentUrl\":\"https:\\\/\\\/www.bonomiacciai.it\\\/wp-content\\\/uploads\\\/2023\\\/08\\\/Bonomi-Acciai_Logo.png\",\"width\":300,\"height\":300,\"caption\":\"Bonomi Acciai\"},\"image\":{\"@id\":\"https:\\\/\\\/www.bonomiacciai.it\\\/#\\\/schema\\\/logo\\\/image\\\/\"}},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/www.bonomiacciai.it\\\/#\\\/schema\\\/person\\\/6a78aa2ff06547ab3b8ec2448c4fe802\",\"name\":\"admin\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/e65c7c4c20860176a5c889891519452a0886fa8cd4f7e7dd6dc351a3eedce6e6?s=96&d=mm&r=g\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/e65c7c4c20860176a5c889891519452a0886fa8cd4f7e7dd6dc351a3eedce6e6?s=96&d=mm&r=g\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/e65c7c4c20860176a5c889891519452a0886fa8cd4f7e7dd6dc351a3eedce6e6?s=96&d=mm&r=g\",\"caption\":\"admin\"},\"sameAs\":[\"https:\\\/\\\/www.bonomiacciai.it\"],\"url\":\"https:\\\/\\\/www.bonomiacciai.it\\\/en\\\/author\\\/admin\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Spheroidized annealing steel: why it improves machinability","description":"Discover what spheroidized annealing (spheroidization) of steel is: process, microstructure, and advantages.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.bonomiacciai.it\/?p=49300","og_locale":"en_US","og_type":"article","og_title":"Spheroidized annealing steel: why it improves machinability","og_description":"Discover what spheroidized annealing (spheroidization) of steel is: process, microstructure, and advantages.","og_url":"https:\/\/www.bonomiacciai.it\/?p=49300","og_site_name":"Bonomi Acciai","article_published_time":"2026-05-19T08:00:03+00:00","og_image":[{"width":1080,"height":1080,"url":"https:\/\/www.bonomiacciai.it\/wp-content\/uploads\/2026\/05\/Stato-di-fornitura3_Blog.jpg","type":"image\/jpeg"}],"author":"admin","twitter_card":"summary_large_image","twitter_misc":{"Written by":"admin","Est. reading time":"4 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.bonomiacciai.it\/?p=49300#article","isPartOf":{"@id":"https:\/\/www.bonomiacciai.it\/?p=49300"},"author":{"name":"admin","@id":"https:\/\/www.bonomiacciai.it\/#\/schema\/person\/6a78aa2ff06547ab3b8ec2448c4fe802"},"headline":"Spheroidized annealing steel: why it improves machinability","datePublished":"2026-05-19T08:00:03+00:00","mainEntityOfPage":{"@id":"https:\/\/www.bonomiacciai.it\/?p=49300"},"wordCount":1083,"publisher":{"@id":"https:\/\/www.bonomiacciai.it\/#organization"},"image":{"@id":"https:\/\/www.bonomiacciai.it\/?p=49300#primaryimage"},"thumbnailUrl":"https:\/\/www.bonomiacciai.it\/wp-content\/uploads\/2026\/05\/Stato-di-fornitura3_Blog.jpg","keywords":["acciai alto carbonio","acciai per utensili","annealed condition","Bonomi Acciai","carburi sferoidali","durezza acciaio","heat treatment of steel","high carbon steels","lamellar pearlite","machining processes","metallurgia acciaio","microstruttura acciaio","perlite lamellare","quenching and tempering","ricottura di sferoidizzazione","ricottura globulare","sferoidizzazione acciaio","spheroidal carbides","spheroidization annealing","spheroidized annealing","spheroidized steel","stato ricotto","steel hardness","Steel machinability","steel metallurgy","steel microstructure","tempra e rinvenimento","tool steels","trattamenti termici acciaio"],"articleSection":["Blog","Home","Technical contents"],"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/www.bonomiacciai.it\/?p=49300","url":"https:\/\/www.bonomiacciai.it\/?p=49300","name":"Spheroidized annealing steel: why it improves machinability","isPartOf":{"@id":"https:\/\/www.bonomiacciai.it\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.bonomiacciai.it\/?p=49300#primaryimage"},"image":{"@id":"https:\/\/www.bonomiacciai.it\/?p=49300#primaryimage"},"thumbnailUrl":"https:\/\/www.bonomiacciai.it\/wp-content\/uploads\/2026\/05\/Stato-di-fornitura3_Blog.jpg","datePublished":"2026-05-19T08:00:03+00:00","description":"Discover what spheroidized annealing (spheroidization) of steel is: process, microstructure, and advantages.","breadcrumb":{"@id":"https:\/\/www.bonomiacciai.it\/?p=49300#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.bonomiacciai.it\/?p=49300"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.bonomiacciai.it\/?p=49300#primaryimage","url":"https:\/\/www.bonomiacciai.it\/wp-content\/uploads\/2026\/05\/Stato-di-fornitura3_Blog.jpg","contentUrl":"https:\/\/www.bonomiacciai.it\/wp-content\/uploads\/2026\/05\/Stato-di-fornitura3_Blog.jpg","width":1080,"height":1080,"caption":"Grafica tecnica Bonomi Acciai dedicata alla ricottura globulare dell\u2019acciaio. L\u2019immagine evidenzia come questo trattamento termico migliori la lavorabilit\u00e0 del materiale, mostrando una rappresentazione della microstruttura globulare e icone relative a certificati, analisi chimiche, prove e test, microstruttura e controlli avanzati."},{"@type":"BreadcrumbList","@id":"https:\/\/www.bonomiacciai.it\/?p=49300#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.bonomiacciai.it\/en\/"},{"@type":"ListItem","position":2,"name":"Spheroidized annealing steel: why it improves machinability"}]},{"@type":"WebSite","@id":"https:\/\/www.bonomiacciai.it\/#website","url":"https:\/\/www.bonomiacciai.it\/","name":"Bonomi Acciai","description":"La tua visione, il nostro acciaio.","publisher":{"@id":"https:\/\/www.bonomiacciai.it\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.bonomiacciai.it\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/www.bonomiacciai.it\/#organization","name":"Bonomi Acciai","url":"https:\/\/www.bonomiacciai.it\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.bonomiacciai.it\/#\/schema\/logo\/image\/","url":"https:\/\/www.bonomiacciai.it\/wp-content\/uploads\/2023\/08\/Bonomi-Acciai_Logo.png","contentUrl":"https:\/\/www.bonomiacciai.it\/wp-content\/uploads\/2023\/08\/Bonomi-Acciai_Logo.png","width":300,"height":300,"caption":"Bonomi Acciai"},"image":{"@id":"https:\/\/www.bonomiacciai.it\/#\/schema\/logo\/image\/"}},{"@type":"Person","@id":"https:\/\/www.bonomiacciai.it\/#\/schema\/person\/6a78aa2ff06547ab3b8ec2448c4fe802","name":"admin","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/secure.gravatar.com\/avatar\/e65c7c4c20860176a5c889891519452a0886fa8cd4f7e7dd6dc351a3eedce6e6?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/e65c7c4c20860176a5c889891519452a0886fa8cd4f7e7dd6dc351a3eedce6e6?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/e65c7c4c20860176a5c889891519452a0886fa8cd4f7e7dd6dc351a3eedce6e6?s=96&d=mm&r=g","caption":"admin"},"sameAs":["https:\/\/www.bonomiacciai.it"],"url":"https:\/\/www.bonomiacciai.it\/en\/author\/admin\/"}]}},"_links":{"self":[{"href":"https:\/\/www.bonomiacciai.it\/en\/wp-json\/wp\/v2\/posts\/49306","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.bonomiacciai.it\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.bonomiacciai.it\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.bonomiacciai.it\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bonomiacciai.it\/en\/wp-json\/wp\/v2\/comments?post=49306"}],"version-history":[{"count":0,"href":"https:\/\/www.bonomiacciai.it\/en\/wp-json\/wp\/v2\/posts\/49306\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bonomiacciai.it\/en\/wp-json\/wp\/v2\/media\/49351"}],"wp:attachment":[{"href":"https:\/\/www.bonomiacciai.it\/en\/wp-json\/wp\/v2\/media?parent=49306"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bonomiacciai.it\/en\/wp-json\/wp\/v2\/categories?post=49306"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bonomiacciai.it\/en\/wp-json\/wp\/v2\/tags?post=49306"},{"taxonomy":"post_series","embeddable":true,"href":"https:\/\/www.bonomiacciai.it\/en\/wp-json\/wp\/v2\/post_series?post=49306"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}