{"id":49688,"date":"2026-07-21T09:40:36","date_gmt":"2026-07-21T07:40:36","guid":{"rendered":"https:\/\/www.bonomiacciai.it\/?p=49688"},"modified":"2026-08-03T10:01:34","modified_gmt":"2026-08-03T08:01:34","slug":"ultrasonic-testing-steel-internal-defects-and-material-quality","status":"publish","type":"post","link":"https:\/\/www.bonomiacciai.it\/en\/ultrasonic-testing-steel-internal-defects-and-material-quality\/","title":{"rendered":"Ultrasonic testing steel: internal defects and material quality"},"content":{"rendered":"<div class=\"wpb-content-wrapper\" id=\"wpb-content-root\">[vc_row el_class=&#8221;ba-intro-lead&#8221;][vc_column][vc_column_text css=&#8221;&#8221;]After analyzing mechanical tests such as hardness and resilience, we enter the field of <strong>non-destructive testing<\/strong>.<\/p>\n<p>Among these, one of the most important is <strong>ultrasonic testing of steel<\/strong>, also referred to by the acronym <strong>UT<\/strong>, from <em>Ultrasonic Testing<\/em>.<\/p>\n<p>It is a non-destructive technique, or <strong>NDT<\/strong>, used to verify the internal integrity of metallic materials without damaging them.<\/p>\n<p>\ud83d\udc49 Ultrasonic testing makes it possible to identify possible internal defects such as:<\/p>\n<ul>\n<li>cracks<\/li>\n<li>porosity<\/li>\n<li>inclusions<\/li>\n<li>internal discontinuities<\/li>\n<li>structural anomalies<\/li>\n<\/ul>\n<p>For this reason, it is a fundamental test in the quality control of <strong>special steels<\/strong>, especially when the material is intended for critical applications.[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column width=&#8221;1\/6&#8243;][\/vc_column][vc_column width=&#8221;2\/3&#8243;]<div class=\"wpex-slider-preloaderimg wpex-relative\"><img width=\"800\" height=\"800\" src=\"https:\/\/www.bonomiacciai.it\/wp-content\/uploads\/2026\/07\/DSC05842.jpg\" class=\"skip-lazy\" alt=\"Controllo UT acciaio nel contesto Bonomi Acciai per verificare l\u2019integrit\u00e0 interna del materiale e rilevare difetti interni con metodo non distruttivo.\" data-no-lazy=\"1\" srcset=\"https:\/\/www.bonomiacciai.it\/wp-content\/uploads\/2026\/07\/DSC05842.jpg 800w, https:\/\/www.bonomiacciai.it\/wp-content\/uploads\/2026\/07\/DSC05842-300x300.jpg 300w, https:\/\/www.bonomiacciai.it\/wp-content\/uploads\/2026\/07\/DSC05842-150x150.jpg 150w, https:\/\/www.bonomiacciai.it\/wp-content\/uploads\/2026\/07\/DSC05842-768x768.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/div><div class=\"vcex-image-slider vcex-module wpex-slider slider-pro wpex-clr\" data-thumbnails=\"true\"><div class=\"wpex-slider-slides sp-slides\"><div class=\"wpex-slider-slide sp-slide\"><div class=\"wpex-slider-media wpex-relative\"><img width=\"800\" height=\"800\" src=\"https:\/\/www.bonomiacciai.it\/wp-content\/uploads\/2026\/07\/DSC05842.jpg\" class=\"skip-lazy\" alt=\"Controllo UT acciaio nel contesto Bonomi Acciai per verificare l\u2019integrit\u00e0 interna del materiale e rilevare difetti interni con metodo non distruttivo.\" data-no-lazy=\"1\" srcset=\"https:\/\/www.bonomiacciai.it\/wp-content\/uploads\/2026\/07\/DSC05842.jpg 800w, https:\/\/www.bonomiacciai.it\/wp-content\/uploads\/2026\/07\/DSC05842-300x300.jpg 300w, https:\/\/www.bonomiacciai.it\/wp-content\/uploads\/2026\/07\/DSC05842-150x150.jpg 150w, https:\/\/www.bonomiacciai.it\/wp-content\/uploads\/2026\/07\/DSC05842-768x768.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/div><\/div><div class=\"wpex-slider-slide sp-slide\"><div class=\"wpex-slider-media wpex-relative\"><img width=\"800\" height=\"800\" src=\"https:\/\/www.bonomiacciai.it\/wp-content\/uploads\/2026\/07\/DSC05845.jpg\" class=\"skip-lazy\" alt=\"Sonda per controllo a ultrasuoni acciaio con gel accoppiatore per trasmettere onde ultrasoniche e individuare cricche o porosit\u00e0 interne\" data-no-lazy=\"1\" srcset=\"https:\/\/www.bonomiacciai.it\/wp-content\/uploads\/2026\/07\/DSC05845.jpg 800w, https:\/\/www.bonomiacciai.it\/wp-content\/uploads\/2026\/07\/DSC05845-300x300.jpg 300w, https:\/\/www.bonomiacciai.it\/wp-content\/uploads\/2026\/07\/DSC05845-150x150.jpg 150w, https:\/\/www.bonomiacciai.it\/wp-content\/uploads\/2026\/07\/DSC05845-768x768.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/div><\/div><\/div><div class=\"wpex-slider-thumbnails sp-thumbnails\"><img width=\"800\" height=\"800\" src=\"https:\/\/www.bonomiacciai.it\/wp-content\/uploads\/2026\/07\/DSC05842.jpg\" class=\"wpex-slider-thumbnail sp-thumbnail skip-lazy\" alt=\"Controllo UT acciaio nel contesto Bonomi Acciai per verificare l\u2019integrit\u00e0 interna del materiale e rilevare difetti interni con metodo non distruttivo.\" data-no-lazy=\"1\" srcset=\"https:\/\/www.bonomiacciai.it\/wp-content\/uploads\/2026\/07\/DSC05842.jpg 800w, https:\/\/www.bonomiacciai.it\/wp-content\/uploads\/2026\/07\/DSC05842-300x300.jpg 300w, https:\/\/www.bonomiacciai.it\/wp-content\/uploads\/2026\/07\/DSC05842-150x150.jpg 150w, https:\/\/www.bonomiacciai.it\/wp-content\/uploads\/2026\/07\/DSC05842-768x768.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><img width=\"800\" height=\"800\" src=\"https:\/\/www.bonomiacciai.it\/wp-content\/uploads\/2026\/07\/DSC05845.jpg\" class=\"wpex-slider-thumbnail sp-thumbnail skip-lazy\" alt=\"Sonda per controllo a ultrasuoni acciaio con gel accoppiatore per trasmettere onde ultrasoniche e individuare cricche o porosit\u00e0 interne\" data-no-lazy=\"1\" srcset=\"https:\/\/www.bonomiacciai.it\/wp-content\/uploads\/2026\/07\/DSC05845.jpg 800w, https:\/\/www.bonomiacciai.it\/wp-content\/uploads\/2026\/07\/DSC05845-300x300.jpg 300w, https:\/\/www.bonomiacciai.it\/wp-content\/uploads\/2026\/07\/DSC05845-150x150.jpg 150w, https:\/\/www.bonomiacciai.it\/wp-content\/uploads\/2026\/07\/DSC05845-768x768.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/div><\/div>[\/vc_column][vc_column width=&#8221;1\/6&#8243;][\/vc_column][\/vc_row][vc_row][vc_column el_class=&#8221;ba-box&#8221;][vc_custom_heading text=&#8221;\ud83d\udd0d What ultrasonic testing is&#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;]<strong>Ultrasonic testing<\/strong> is a non-destructive testing technique that uses high-frequency sound waves to analyze the inside of the material.<\/p>\n<p>Unlike a destructive test, this control does not compromise the integrity of the part.<\/p>\n<p>\ud83d\udc49 In practice:<\/p>\n<ul>\n<li>a probe sends ultrasonic waves into the material<\/li>\n<li>the waves propagate inside the steel<\/li>\n<li>any discontinuities reflect part of the signal<\/li>\n<li>the instrument interprets the received signal<\/li>\n<li>the operator assesses the presence of possible defects<\/li>\n<\/ul>\n<p>The result is an internal inspection of the material, without having to section or break it.[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column el_class=&#8221;ba-box&#8221;][vc_custom_heading text=&#8221;\ud83e\uddea Why perform ultrasonic testing&#8221; use_theme_fonts=&#8221;yes&#8221; css=&#8221;&#8221;][vc_column_text css=&#8221;&#8221;]Ultrasonic testing is important because it allows aspects to be verified that would not be visible through an external inspection.<\/p>\n<p>An apparently correct surface can in fact hide internal defects.<\/p>\n<p>\ud83d\udc49 This test makes it possible to:<\/p>\n<ul>\n<li>verify the structural integrity of the material<\/li>\n<li>identify internal defects<\/li>\n<li>check the homogeneity of the steel<\/li>\n<li>prevent possible failures in service<\/li>\n<li>support compliance with the required specifications<\/li>\n<li>increase the level of reliability of the material<\/li>\n<\/ul>\n<p>In sectors such as automotive, energy, aerospace and tooling, this control can be decisive in ensuring safety and performance.[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column el_class=&#8221;ba-box&#8221;][vc_custom_heading text=&#8221;\u2699\ufe0f How ultrasonic testing works&#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 operating principle of ultrasonic testing is based on the propagation of sound waves inside the material.<\/p>\n<p>When the waves encounter a discontinuity, part of the signal is reflected.<\/p>\n<p>\ud83d\udc49 The instrument detects these variations and converts them into interpretable signals.<\/p>\n<p>In this way, it is possible to assess whether there are anomalies inside the steel that could compromise its behavior.<\/p>\n<p>The inspection can be performed on different material formats, such as bars, blocks, plates or components, based on technical requirements and requested specifications.[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column el_class=&#8221;ba-box&#8221;][vc_custom_heading text=&#8221;\ud83e\uddf0 Equipment 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;]Specific instruments are required to perform ultrasonic testing.<\/p>\n<p>Among the main ones we find:<\/p>\n<ul>\n<li><strong>ultrasonic probe<\/strong>, which emits and receives sound waves<\/li>\n<li><strong>UT equipment<\/strong>, which analyzes and displays the signals<\/li>\n<li><strong>acoustic couplant<\/strong>, usually a gel applied to the surface of the material<\/li>\n<li><strong>software or reading display<\/strong>, used to interpret the signal<\/li>\n<\/ul>\n<p>The coupling gel is important because it improves the transmission of waves between the probe and the metal surface.<\/p>\n<p>Without proper coupling, the signal may be weak or unreliable.[\/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 the inspection is performed&#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;]Ultrasonic testing requires proper preparation of the material and a controlled procedure.<\/p>\n<p>\ud83d\udc49 In general, the main steps are:<\/p>\n<ol>\n<li><strong>Surface preparation<\/strong><br \/>\nThe area to be inspected must be clean, accessible and preferably regular.<\/li>\n<li><strong>Application of the couplant<\/strong><br \/>\nThe gel is applied to the surface to promote the transmission of ultrasonic waves.<\/li>\n<li><strong>Positioning of the probe<\/strong><br \/>\nThe probe is placed on the material and moved according to the area to be analyzed.<\/li>\n<li><strong>Emission of the waves<\/strong><br \/>\nThe instrument sends ultrasonic waves inside the material.<\/li>\n<li><strong>Signal reading<\/strong><br \/>\nThe reflected waves are detected and displayed on the instrument.<\/li>\n<li><strong>Interpretation of the result<\/strong><br \/>\nThe operator assesses any indications that may be attributable to defects or discontinuities.<\/li>\n<\/ol>\n<p>\u2714 The quality of the inspection depends both on the instrumentation and on the operator\u2019s experience.[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column el_class=&#8221;ba-box&#8221;][vc_custom_heading text=&#8221;\ud83e\udde0 What can be understood from metallography&#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;\">The analysis of metallographic images makes it possible to obtain very important information about the material.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\ud83d\udc49<\/span><span style=\"font-weight: 400;\"> In particular, it allows you to:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">identify the metallic phases present<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">assess their distribution<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">measure or estimate grain size<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">assess the quality of heat treatments<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">verify the presence of the expected microstructures<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">identify non-metallic inclusions<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">observe porosity or cracks<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Metallography therefore makes it possible to understand whether the material is consistent with the required condition and with the final application.<\/span>[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column el_class=&#8221;ba-box&#8221;][vc_custom_heading text=&#8221;\ud83e\uddf1 Defects detectable with ultrasound&#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;]Ultrasonic testing is particularly effective in detecting internal defects that could compromise the reliability of the material.<\/p>\n<p>Among the main detectable defects we find:<\/p>\n<ul>\n<li><strong>internal cracks<\/strong>, which can reduce mechanical integrity<\/li>\n<li><strong>porosity<\/strong>, meaning cavities or voids inside the material<\/li>\n<li><strong>non-metallic inclusions<\/strong>, which can weaken the structure<\/li>\n<li><strong>internal discontinuities<\/strong><\/li>\n<li><strong>rolling or processing defects<\/strong><\/li>\n<li><strong>lack of homogeneity<\/strong><\/li>\n<\/ul>\n<p>\ud83d\udc49 Early detection of these defects makes it possible to reduce the risk of problems during subsequent processing or during final use.[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column el_class=&#8221;ba-box&#8221;][vc_custom_heading text=&#8221;\ud83d\udd2c What influences the effectiveness of the inspection&#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 effectiveness of ultrasonic testing can depend on several factors.<\/p>\n<p>Among the main ones are:<\/p>\n<ul>\n<li>type of material<\/li>\n<li>density and homogeneity of the steel<\/li>\n<li>geometry of the part<\/li>\n<li>material thickness<\/li>\n<li>surface condition<\/li>\n<li>orientation of possible defects<\/li>\n<li>accessibility of the area to be inspected<\/li>\n<li>operator competence<\/li>\n<\/ul>\n<p>An irregular, dirty or unsuitable surface can reduce the quality of the signal.<\/p>\n<p>Complex geometries can also generate reflections that are difficult to interpret.<\/p>\n<p>\ud83d\udc49 For this reason, preparation of the part and correct inspection setup are fundamental.[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column el_class=&#8221;ba-box&#8221;][vc_custom_heading text=&#8221;\ud83c\udfed Ultrasonic testing in the BA laboratory&#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;]In the path dedicated to steel quality, ultrasonic testing represents a fundamental step because it makes it possible to go beyond what is visible on the surface.<\/p>\n<p>After analyzing chemical composition, hardness and resilience, UT inspection introduces another level of verification: the internal integrity of the material.<\/p>\n<p>Each control contributes to building a complete view of steel quality.[\/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;\">In the path dedicated to steel quality, metallography represents a fundamental step because it makes it possible to directly observe the internal structure of the material.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">After analyzing chemical composition, hardness, resilience and non-destructive testing, metallographic examination adds an even deeper level of reading.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\ud83d\udc49<\/span><span style=\"font-weight: 400;\"> In fact, it makes it possible to connect:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">chemical composition<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">heat treatments<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">microstructure<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">mechanical properties<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">behavior in service<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Each microscope image tells part of the material\u2019s story.<\/span>[\/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;]Ultrasonic testing of steel is a fundamental non-destructive technique for verifying the internal integrity of the material.<\/p>\n<p>It makes it possible to detect defects such as cracks, porosity, inclusions and internal discontinuities without compromising the part.<\/p>\n<p>\ud83d\udc49 For this reason, it is an essential tool in the quality control of special steels, especially when the material is intended for applications in which reliability and safety are fundamental requirements.<\/p>\n<p>Understanding ultrasonic testing means understanding how it is possible to \u201csee inside\u201d steel and assess its internal quality.[\/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_content&#8221; css=&#8221;.vc_custom_1785743590014{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<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<h3 style=\"text-align: center;\" data-path-to-node=\"2,0\"><strong>Do you want to learn more about how checks and inspections on steel are managed?<\/strong><\/h3>\n<h3 style=\"text-align: center;\" data-path-to-node=\"2,1\"><a href=\"https:\/\/www.bonomiacciai.it\/en\/contacts\/\">Contact us<\/a> to speak with our technical department.<\/h3>\n<h3 style=\"text-align: center;\" data-path-to-node=\"2,1\">Or fill out the form below to receive more information.<\/h3>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\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 department:&#8221; font_container=&#8221;tag:h2|font_size:26px|text_align:center|color:%23172028&#8243; use_theme_fonts=&#8221;yes&#8221;][\/vc_column_inner][vc_column_inner 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Among these, one of the most important is ultrasonic testing of steel, also referred to by the acronym UT, from Ultrasonic Testing. It is a non-destructive technique, or NDT, used to verify the internal integrity of metallic&hellip;<\/p>\n","protected":false},"author":1,"featured_media":49690,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2175,2176,1720],"tags":[3035,3279,3466,3462,3464,3125,3461,3460,2162,3273,3368,3412,3463,2989,2087,2153,3465,3458,3457,3459],"post_series":[],"class_list":["post-49688","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog-en","category-home-en","category-technical-contents","tag-anatomy-of-steel","tag-bonomi-acciai-laboratory","tag-coupling-gel","tag-internal-defects-steel","tag-internal-integrity-steel","tag-metallic-materials","tag-ndt-steel","tag-non-destructive-testing-steel","tag-special-steels","tag-steel-certificate-3-1","tag-steel-cracks","tag-steel-inclusions","tag-steel-porosity","tag-steel-quality-control","tag-swiss-steel-group-en","tag-tool-steels","tag-ultrasonic-probe","tag-ultrasonic-testing-materials","tag-ultrasonic-testing-steel","tag-ut-testing-steel","entry","has-media"],"yoast_head":"<!-- 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