{"id":47948,"date":"2025-07-15T17:10:06","date_gmt":"2025-07-15T15:10:06","guid":{"rendered":"https:\/\/www.bonomiacciai.it\/trattamenti-termici-la-tempra-a-induzione\/"},"modified":"2025-07-15T17:41:31","modified_gmt":"2025-07-15T15:41:31","slug":"induction-hardening","status":"publish","type":"post","link":"https:\/\/www.bonomiacciai.it\/en\/induction-hardening\/","title":{"rendered":"Induction Hardening Treatment"},"content":{"rendered":"<div class=\"wpb-content-wrapper\" id=\"wpb-content-root\">[vc_row][vc_column][vc_column_text css=&#8221;&#8221;]Induction hardening is a surface heat treatment process designed to improve the wear resistance and fatigue strength of components subject to high stress or friction.<br data-start=\"407\" data-end=\"410\" \/>The process involves rapid heating\u2014caused by Joule effect from induced currents\u2014of a metallic body (a good electrical conductor) placed inside a variable electromagnetic field generated by an inductor.[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_single_image image=&#8221;47936&#8243; add_caption=&#8221;yes&#8221; alignment=&#8221;center&#8221; onclick=&#8221;img_link_large&#8221; css=&#8221;&#8221;][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text css=&#8221;&#8221;]Heating occurs without physical contact: the induced electrical currents heat the material to austenitic temperatures in a matter of seconds, allowing precise control over the desired case depth.<br data-start=\"958\" data-end=\"961\" \/>This is followed by a quenching phase\u2014achieved through immersion or spray nozzles\u2014using different quenching media (air blast, water, or polymer solutions), depending on the steel grade (including quenched-and-tempered steels) and performance requirements.<br data-start=\"1216\" data-end=\"1219\" \/>To avoid overheating during operation, the induction coil is typically cooled by internal circulation of demineralized water.[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text css=&#8221;&#8221;]\n<p data-start=\"1346\" data-end=\"1400\">In industrial applications, heating is achieved using:<\/p>\n<ul data-start=\"1402\" data-end=\"1525\">\n<li data-start=\"1402\" data-end=\"1440\">\n<p data-start=\"1404\" data-end=\"1440\">Low-frequency generators (&lt; 2 kHz)<\/p>\n<\/li>\n<li data-start=\"1441\" data-end=\"1485\">\n<p data-start=\"1443\" data-end=\"1485\">Medium-frequency generators (2 \u00f7 30 kHz)<\/p>\n<\/li>\n<li data-start=\"1486\" data-end=\"1525\">\n<p data-start=\"1488\" data-end=\"1525\">High-frequency generators (&gt; 150 kHz)<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"1527\" data-end=\"1696\">The depth of the heated layer is inversely proportional to the frequency: low frequencies produce deeper hardening, while high frequencies affect only a few millimetres.<\/p>\n[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column]<div class=\"vcex-module vcex-divider vcex-divider-solid vcex-divider-center wpex-mx-auto wpex-block wpex-h-0 wpex-border-b wpex-border-solid wpex-border-main\" style=\"border-color:#ebebeb;\"><\/div>[\/vc_column][\/vc_row][vc_row][vc_column][vc_custom_heading text=&#8221;Advantages of Induction Hardening&#8221; use_theme_fonts=&#8221;yes&#8221; css=&#8221;&#8221;][vc_empty_space height=&#8221;16px&#8221;][vc_column_text css=&#8221;&#8221;]\n<p data-start=\"1746\" data-end=\"1942\">This treatment significantly increases surface hardness and wear resistance, extending the service life of components.<br data-start=\"1864\" data-end=\"1867\" \/>Compared to traditional furnace-based processes, the main benefits include:<\/p>\n<ul data-start=\"1944\" data-end=\"2208\">\n<li data-start=\"1944\" data-end=\"2040\">\n<p data-start=\"1946\" data-end=\"2040\"><strong data-start=\"1946\" data-end=\"1961\">Flexibility<\/strong>: selectively hardens specific areas of any geometry without altering the core.<\/p>\n<\/li>\n<li data-start=\"1944\" data-end=\"2040\">\n<p data-start=\"1946\" data-end=\"2040\"><strong data-start=\"2043\" data-end=\"2052\">Speed<\/strong>: heating and cooling occur within seconds.<\/p>\n<\/li>\n<li data-start=\"2096\" data-end=\"2208\">\n<p data-start=\"2098\" data-end=\"2208\"><strong data-start=\"2098\" data-end=\"2121\">In-line integration<\/strong>: one of the few heat treatments that can be implemented directly on a production line.<\/p>\n<\/li>\n<\/ul>\n[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column]<div class=\"vcex-module vcex-divider vcex-divider-solid vcex-divider-center wpex-mx-auto wpex-block wpex-h-0 wpex-border-b wpex-border-solid wpex-border-main\" style=\"border-color:#ebebeb;\"><\/div>[\/vc_column][\/vc_row][vc_row][vc_column][vc_custom_heading text=&#8221;Applications of Induction Hardening&#8221; use_theme_fonts=&#8221;yes&#8221; css=&#8221;&#8221;][vc_empty_space height=&#8221;16px&#8221;][vc_column_text css=&#8221;&#8221;]\n<p data-start=\"2260\" data-end=\"2424\">The process is widely used in sectors such as automotive, rail, marine, energy, aerospace, and heavy mechanics.<br data-start=\"2371\" data-end=\"2374\" \/>Examples of localized induction hardening include:<\/p>\n<ul data-start=\"2426\" data-end=\"2627\">\n<li data-start=\"2426\" data-end=\"2465\">\n<p data-start=\"2428\" data-end=\"2465\">Rollers, cylinders, columns, shafts<\/p>\n<\/li>\n<li data-start=\"2466\" data-end=\"2538\">\n<p data-start=\"2468\" data-end=\"2538\">Power transmission components (gears, pinions, racks, slewing rings)<\/p>\n<\/li>\n<li data-start=\"2539\" data-end=\"2577\">\n<p data-start=\"2541\" data-end=\"2577\">Wheels, sheaves, capstans, pulleys<\/p>\n<\/li>\n<li data-start=\"2578\" data-end=\"2608\">\n<p data-start=\"2580\" data-end=\"2608\">Crossbeams, guides, blades<\/p>\n<\/li>\n<li data-start=\"2609\" data-end=\"2627\">\n<p data-start=\"2611\" data-end=\"2627\">Dies and molds<\/p>\n<\/li>\n<\/ul>\n[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column width=&#8221;1\/4&#8243;][\/vc_column][vc_column width=&#8221;1\/2&#8243;][vc_single_image image=&#8221;47940&#8243; add_caption=&#8221;yes&#8221; alignment=&#8221;left&#8221; onclick=&#8221;img_link_large&#8221; css=&#8221;&#8221;][\/vc_column][vc_column width=&#8221;1\/4&#8243;][\/vc_column][\/vc_row][vc_row][vc_column width=&#8221;1\/4&#8243;][\/vc_column][vc_column width=&#8221;1\/2&#8243;][vc_single_image image=&#8221;47941&#8243; add_caption=&#8221;yes&#8221; alignment=&#8221;left&#8221; onclick=&#8221;img_link_large&#8221; css=&#8221;&#8221;][\/vc_column][vc_column width=&#8221;1\/4&#8243;][\/vc_column][\/vc_row][vc_row][vc_column]<div class=\"vcex-module vcex-divider vcex-divider-solid vcex-divider-center wpex-mx-auto wpex-block wpex-h-0 wpex-border-b wpex-border-solid wpex-border-main\" style=\"border-color:#ebebeb;\"><\/div>[\/vc_column][\/vc_row][vc_row][vc_column][vc_custom_heading text=&#8221;Conclusion&#8221; use_theme_fonts=&#8221;yes&#8221; css=&#8221;&#8221;][vc_empty_space height=&#8221;16px&#8221;][vc_column_text css=&#8221;&#8221;]\n<div class=\"flex-shrink-0 flex flex-col relative items-end\">\n<div class=\"pt-0\">\n<div class=\"gizmo-bot-avatar flex h-8 w-8 items-center justify-center overflow-hidden rounded-full\">\n<div class=\"relative p-1 rounded-sm flex items-center justify-center bg-token-main-surface-primary text-token-text-primary h-8 w-8\">\n<div class=\"flex-shrink-0 flex flex-col relative items-end\">\n<div class=\"pt-0\">\n<div class=\"gizmo-bot-avatar flex h-8 w-8 items-center justify-center overflow-hidden rounded-full\">\n<div class=\"relative p-1 rounded-sm flex items-center justify-center bg-token-main-surface-primary text-token-text-primary h-8 w-8\">\n<p>Induction hardening makes it possible to obtain hard, wear-resistant surfaces while preserving the toughness of the core. A fast, precise, and localized treatment\u2014ideal for enhancing the performance and longevity of mechanical components.<\/p>\n<\/div>\n<p><span style=\"font-weight: 400;\"><a href=\"https:\/\/www.bonomiacciai.it\/en\/\">Bonomi Acciai<\/a>, official representatives in Italy of <a href=\"https:\/\/swisssteel-group.com\/it\">Swiss Steel Group<\/a>, support engineers in selecting the most suitable steels and thermal treatments for every specific application.<\/span><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n[\/vc_column_text][\/vc_column][\/vc_row][vc_row full_width=&#8221;stretch_row_content&#8221; css=&#8221;.vc_custom_1717678542423{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_custom_heading text=&#8221;Would you like to learn more?&#8221; font_container=&#8221;tag:h2|font_size:46px|text_align:center|color:%23172028&#8243; 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aria-hidden=\"true\"><\/div>\n<\/form>\n<\/div>\n[\/vc_column][\/vc_row]\n<\/div>","protected":false},"excerpt":{"rendered":"<p>[vc_row][vc_column][vc_column_text css=&#8221;&#8221;]Induction hardening is a surface heat treatment process designed to improve the wear resistance and fatigue strength of components subject to high stress or friction.The process involves rapid heating\u2014caused by Joule effect from induced currents\u2014of a metallic body (a good electrical conductor) placed inside a variable electromagnetic field generated by an inductor.[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_single_image image=&#8221;47936&#8243; add_caption=&#8221;yes&#8221;&hellip;<\/p>\n","protected":false},"author":1,"featured_media":47935,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2175,2176,1720,2177],"tags":[2210,1777,1694,2178,2218,2161,2211,2221,2220,2212,2162,2219,2215,2213,2217,2214,1907,2216],"post_series":[],"class_list":["post-47948","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog-en","category-home-en","category-technical-contents","category-trattamenti-termici-en","tag-acciai-da-bonifica-en","tag-ba-en","tag-bonomi-acciai-en","tag-durezza-superficiale-en","tag-hardened-steel-components","tag-heat-treatment","tag-induction-hardening-en","tag-industrial-metallurgy","tag-localized-hardening","tag-profondita-di-indurimento-en","tag-special-steels","tag-steel-heat-treatment","tag-surface-hardening","tag-tempra-a-induzione-en","tag-thermal-processing","tag-trattamenti-superficiali-en","tag-trattamenti-termici-en","tag-wear-resistance","entry","has-media"],"yoast_head":"<!-- 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