{"id":30604,"date":"2026-03-30T03:35:45","date_gmt":"2026-03-30T03:35:45","guid":{"rendered":"https:\/\/hardnesstests.com\/?p=30604"},"modified":"2026-03-30T03:35:46","modified_gmt":"2026-03-30T03:35:46","slug":"leeb-hardness-test-a-comprehensive-technical-guide-2025","status":"publish","type":"post","link":"https:\/\/hardnesstests.com\/es\/leeb-hardness-test-a-comprehensive-technical-guide-2025\/","title":{"rendered":"Ensayo de dureza Leeb: una gu\u00eda t\u00e9cnica exhaustiva (2025)"},"content":{"rendered":"<h2 class=\"wp-block-heading\" id=\"h-introduction-to-the-leeb-hardness-test\">Introducci\u00f3n al ensayo de dureza Leeb<\/h2>\n\n\n\n<p>En <strong>Ensayo de dureza Leeb<\/strong>\u200b es un <strong>m\u00e9todo de ensayo de dureza por rebote din\u00e1mico<\/strong>\u200b Se utiliza para medir la dureza de los materiales met\u00e1licos de forma r\u00e1pida y no destructiva. A diferencia de los ensayos de indentaci\u00f3n tradicionales (como los de Brinell, Rockwell o Vickers), el ensayo Leeb eval\u00faa la dureza mediante el an\u00e1lisis de la <strong>velocidad de rebote<\/strong>\u200b de un cuerpo de impacto de carburo de tungsteno que se deja caer sobre la superficie de ensayo.<\/p>\n\n\n\n<p>Desarrollado en la d\u00e9cada de 1970 por el ingeniero suizo Dr. Dietmar Leeb, el m\u00e9todo se dise\u00f1\u00f3 para superar las limitaciones de los ensayos de dureza convencionales, especialmente en lo que respecta a <strong>componentes grandes, pesados o de formas complejas<\/strong>\u200b cuando los m\u00e9todos tradicionales resultan poco pr\u00e1cticos. Hoy en d\u00eda, el ensayo de Leeb est\u00e1 normalizado seg\u00fan <strong>ISO 16859<\/strong>\u200b y se utiliza ampliamente en sectores como la siderurgia, el petr\u00f3leo y el gas, la industria aeroespacial, la maquinaria pesada y la inspecci\u00f3n sobre el terreno.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-principle-of-the-leeb-hardness-test\">Principio del ensayo de dureza de Leeb<\/h2>\n\n\n\n<p>El ensayo de dureza Leeb se basa en un <strong>principio del rebote din\u00e1mico<\/strong>, lo que supone una diferencia fundamental con respecto a las pruebas de indentaci\u00f3n est\u00e1ticas.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-physical-principle\">Principio f\u00edsico<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Impacto<\/strong>: Se lanza un cuerpo de impacto definido (normalmente de carburo de tungsteno) contra la superficie de ensayo con una energ\u00eda de impacto preestablecida.<\/li>\n\n\n\n<li><strong>Contacto y deformaci\u00f3n<\/strong>: Al impactar contra la superficie, la energ\u00eda cin\u00e9tica se absorbe parcialmente mediante la deformaci\u00f3n pl\u00e1stica del material.<\/li>\n\n\n\n<li><strong>Rebote<\/strong>: El cuerpo que sufre el impacto rebota; cuanto m\u00e1s duro es el material, mayor es la velocidad de rebote.<\/li>\n\n\n\n<li><strong>Medici\u00f3n de la velocidad<\/strong>: El instrumento mide la velocidad de impacto (vi\u200b) y la velocidad de rebote (vr\u200b).<\/li>\n\n\n\n<li><strong>C\u00e1lculo de la dureza<\/strong>: La dureza Leeb (HL) se calcula a partir de la relaci\u00f3n entre la velocidad de rebote y la velocidad de impacto.<\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"800\" src=\"https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/63-800x800.jpg\" alt=\"\" class=\"wp-image-30379\" srcset=\"https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/63-800x800.jpg 800w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/63-300x300.jpg 300w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/63-150x150.jpg 150w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/63-768x768.jpg 768w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/63-12x12.jpg 12w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/63-400x400.jpg 400w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/63-700x700.jpg 700w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/63.jpg 900w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-leeb-hardness-formula\">F\u00f3rmula de dureza de Leeb<\/h3>\n\n\n\n<pre class=\"wp-block-preformatted\">HL = 1000 \u00d7 vi\u200bvr\u200b\u200b<\/pre>\n\n\n\n<p>D\u00f3nde:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>vi\u200b= Velocidad de impacto (m\/s)<\/li>\n\n\n\n<li>vr\u200b= Velocidad de rebote (m\/s)<\/li>\n<\/ul>\n\n\n\n<p>El resultado se expresa como <strong>Unidades HL<\/strong>, que luego pueden convertirse a escalas m\u00e1s conocidas (Rockwell, Brinell, Vickers) mediante tablas de conversi\u00f3n normalizadas.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-instrumentation-and-components\">Instrumentaci\u00f3n y componentes<\/h2>\n\n\n\n<p>Un dur\u00f3metro Leeb t\u00edpico consta de:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-1-impact-device\">1. Dispositivo de impacto<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Cuerpo de impacto<\/strong>: Esfera de carburo de tungsteno (est\u00e1ndar) o de diamante para aplicaciones especializadas.<\/li>\n\n\n\n<li><strong>Sistema de propulsi\u00f3n por resorte o electromagn\u00e9tico<\/strong>.<\/li>\n\n\n\n<li><strong>Sensores de velocidad integrados<\/strong>\u200b (basadas en bobina o l\u00e1ser).<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-2-support-and-positioning-system\">2. Sistema de soporte y posicionamiento<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Sondas port\u00e1tiles<\/strong>\u200b para pruebas port\u00e1tiles.<\/li>\n\n\n\n<li><strong>Dispositivos fijos<\/strong>\u200b para uso automatizado o en laboratorio.<\/li>\n\n\n\n<li><strong>Acoplamiento flexible<\/strong>\u200b para garantizar que la direcci\u00f3n del impacto sea constante.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-3-display-and-data-processing-unit\">3. Unidad de visualizaci\u00f3n y procesamiento de datos<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Pantalla digital<\/strong>\u200b de los valores de HL.<\/li>\n\n\n\n<li><strong>Conversi\u00f3n a bordo<\/strong>\u200b a Rockwell, Brinell, Vickers, etc.<\/li>\n\n\n\n<li><strong>Registro de datos y exportaci\u00f3n por USB o Bluetooth<\/strong>.<\/li>\n\n\n\n<li><strong>Integraci\u00f3n de software<\/strong>\u200b para la elaboraci\u00f3n de informes y an\u00e1lisis.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-standard-test-procedure-iso-16859\">Procedimiento de ensayo normalizado (ISO 16859)<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-1-surface-preparation\">1. Preparaci\u00f3n de la superficie<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>La superficie debe ser razonablemente lisa (rugosidad \u2264 Ra 10 \u00b5m).<\/li>\n\n\n\n<li>Elimina las incrustaciones, el \u00f3xido, el aceite o la pintura desprendida.<\/li>\n\n\n\n<li>Los requisitos de espesor m\u00ednimo dependen de la dureza y la curvatura.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-2-probe-positioning\">2. Colocaci\u00f3n de la sonda<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Mant\u00e9n la sonda en posici\u00f3n perpendicular a la superficie de ensayo.<\/li>\n\n\n\n<li>Aseg\u00farate de que el contacto sea firme, sin que se incline ni se tambalee.<\/li>\n\n\n\n<li>Mant\u00e9n una orientaci\u00f3n constante (la direcci\u00f3n del impacto influye en los resultados).<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-3-impact-and-measurement\">3. Impacto y medici\u00f3n<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Activa el impacto; el dispositivo registra autom\u00e1ticamente las velocidades.<\/li>\n\n\n\n<li>Espera a que la lectura se estabilice (normalmente, menos de 1 segundo).<\/li>\n\n\n\n<li>Anota el valor de HL.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-4-multiple-measurements\">4. Mediciones m\u00faltiples<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Realizar <strong>al menos 5 impactos<\/strong>\u200b en cada lugar.<\/li>\n\n\n\n<li>Calcula el valor medio de HL.<\/li>\n\n\n\n<li>Descarta los valores at\u00edpicos provocados por defectos en la superficie o por un contacto inadecuado.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-leeb-hardness-conversion\">Conversi\u00f3n de la dureza Leeb<\/h2>\n\n\n\n<p>Los valores de dureza Leeb (HL) se correlacionan emp\u00edricamente con otras escalas de dureza. Las conversiones est\u00e1ndar incluyen:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Leeb HL<\/th><th>Rockwell C (HRC)<\/th><th>Brinell (HBW)<\/th><th>Vickers (HV)<\/th><\/tr><\/thead><tbody><tr><td>300<\/td><td>\u224810<\/td><td>\u2248105<\/td><td>\u2248110<\/td><\/tr><tr><td>400<\/td><td>\u224820<\/td><td>\u2248145<\/td><td>\u2248155<\/td><\/tr><tr><td>500<\/td><td>\u224830<\/td><td>\u2248190<\/td><td>\u2248200<\/td><\/tr><tr><td>600<\/td><td>\u224840<\/td><td>\u2248235<\/td><td>\u2248245<\/td><\/tr><tr><td>700<\/td><td>\u224850<\/td><td>\u2248285<\/td><td>\u2248295<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u26a0\ufe0f Las conversiones dependen del material. Utiliza siempre la tabla espec\u00edfica del material correspondiente (acero, hierro fundido, aluminio, etc.).<\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-applications-of-the-leeb-hardness-test\">Aplicaciones del ensayo de dureza Leeb<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-1-large-and-heavy-components\">1. Componentes grandes y pesados<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Chapas y tubos de acero<\/strong><\/li>\n\n\n\n<li><strong>Recipientes a presi\u00f3n<\/strong><\/li>\n\n\n\n<li><strong>Casco de buques y estructuras mar\u00edtimas<\/strong><\/li>\n\n\n\n<li><strong>Torres de aerogeneradores<\/strong><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-2-field-and-in-service-inspection\">2. Inspecci\u00f3n sobre el terreno y en servicio<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Evaluaci\u00f3n de la integridad de las tuber\u00edas<\/strong><\/li>\n\n\n\n<li><strong>Puentes de acero estructural<\/strong><\/li>\n\n\n\n<li><strong>Mantenimiento de maquinaria pesada<\/strong><\/li>\n\n\n\n<li><strong>Tren de aterrizaje aeroespacial<\/strong><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-3-heat-treatment-verification\">3. Verificaci\u00f3n del tratamiento t\u00e9rmico<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Cementaci\u00f3n<\/strong><\/li>\n\n\n\n<li><strong>Templado por inducci\u00f3n<\/strong><\/li>\n\n\n\n<li><strong>Nitruraci\u00f3n<\/strong><\/li>\n\n\n\n<li><strong>Validaci\u00f3n del recocido y el temple<\/strong><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-4-metallurgical-research\">4. Investigaci\u00f3n metal\u00fargica<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Mapeo de dureza<\/strong><\/li>\n\n\n\n<li><strong>An\u00e1lisis de la zona afectada por el calor<\/strong><\/li>\n\n\n\n<li><strong>An\u00e1lisis de fallos<\/strong><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-advantages-of-the-leeb-test\">Ventajas del ensayo de Leeb<\/h2>\n\n\n\n<p>\u2705 <strong>Port\u00e1til y r\u00e1pido<\/strong>\u200b \u2013 Ideal para su uso sobre el terreno<\/p>\n\n\n\n<p>\u2705 <strong>No destructivo<\/strong>\u200b \u2013 M\u00ednimas marcas en la superficie<\/p>\n\n\n\n<p>\u2705 <strong>Preparaci\u00f3n m\u00ednima de la superficie<\/strong>\u200b en comparaci\u00f3n con los ensayos de indentaci\u00f3n<\/p>\n\n\n\n<p>\u2705 <strong>Adecuado para componentes grandes, irregulares o ya instalados<\/strong>\u200b<\/p>\n\n\n\n<p>\u2705 <strong>Lectura y conversi\u00f3n digitales inmediatas<\/strong>\u200b<\/p>\n\n\n\n<p>\u2705 <strong>Alta repetibilidad<\/strong>\u200b cuando se aplica correctamente<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"736\" height=\"736\" src=\"https:\/\/hardnesstests.com\/wp-content\/uploads\/2025\/12\/11.jpg\" alt=\"\" class=\"wp-image-30232\" srcset=\"https:\/\/hardnesstests.com\/wp-content\/uploads\/2025\/12\/11.jpg 736w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2025\/12\/11-300x300.jpg 300w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2025\/12\/11-150x150.jpg 150w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2025\/12\/11-12x12.jpg 12w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2025\/12\/11-400x400.jpg 400w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2025\/12\/11-700x700.jpg 700w\" sizes=\"auto, (max-width: 736px) 100vw, 736px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-limitations-and-sources-of-error\">Limitaciones y fuentes de error<\/h2>\n\n\n\n<p>\u274c <strong>Sensible a la direcci\u00f3n<\/strong>\u200b \u2013 Es necesario controlar la orientaci\u00f3n del impacto<\/p>\n\n\n\n<p>\u274c <strong>No apto para materiales finos<\/strong>\u200b (&lt;2\u20133 mm, dependiendo de la dureza)<\/p>\n\n\n\n<p>\u274c <strong>La rugosidad de la superficie afecta a la precisi\u00f3n<\/strong>\u200b<\/p>\n\n\n\n<p>\u274c <strong>Las conversiones emp\u00edricas pueden generar incertidumbre<\/strong>\u200b<\/p>\n\n\n\n<p>\u274c <strong>No es ideal para materiales muy duros o muy blandos<\/strong>\u200b fuera del rango de calibraci\u00f3n<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-comparison-with-other-hardness-tests\">Comparaci\u00f3n con otras pruebas de dureza<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Caracter\u00edstica<\/th><th>Leeb<\/th><th>Rockwell<\/th><th>Brinell<\/th><th>Vickers<\/th><\/tr><\/thead><tbody><tr><td>Tipo de prueba<\/td><td>Rebote din\u00e1mico<\/td><td>Sangr\u00eda est\u00e1tica<\/td><td>Sangr\u00eda est\u00e1tica<\/td><td>Sangr\u00eda est\u00e1tica<\/td><\/tr><tr><td>Portabilidad<\/td><td>Excelente<\/td><td>Pobre<\/td><td>Pobre<\/td><td>Pobre<\/td><\/tr><tr><td>Preparaci\u00f3n de la superficie<\/td><td>Bajo<\/td><td>Medio<\/td><td>Alto<\/td><td>Alto<\/td><\/tr><tr><td>Da\u00f1os<\/td><td>M\u00ednimo<\/td><td>Moderado<\/td><td>Alto<\/td><td>Alto<\/td><\/tr><tr><td>Velocidad<\/td><td>Muy r\u00e1pido<\/td><td>R\u00e1pido<\/td><td>Lento<\/td><td>Lento<\/td><\/tr><tr><td>Ideal para<\/td><td>Piezas de gran tama\u00f1o, uso en el terreno<\/td><td>Laboratorio\/producci\u00f3n<\/td><td>Piezas en bruto<\/td><td>Materiales finos\/duros<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-best-practices-for-accurate-results\">Buenas pr\u00e1cticas para obtener resultados precisos<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Sigue siempre <strong>ISO 16859<\/strong>\u200b procedimientos.<\/li>\n\n\n\n<li>Mantener <strong>orientaci\u00f3n constante de la sonda<\/strong>\u200b (normalmente un impacto vertical).<\/li>\n\n\n\n<li>Utilice <strong>tablas de conversi\u00f3n adecuadas<\/strong>\u200b para el material sometido a ensayo.<\/li>\n\n\n\n<li>Evita los bordes, las esquinas y las superficies curvas, a menos que se hayan corregido.<\/li>\n\n\n\n<li>Con regularidad <strong>calibrar el instrumento<\/strong>\u200b con bloques de referencia certificados.<\/li>\n\n\n\n<li>Calcula la media de varias lecturas para minimizar la dispersi\u00f3n estad\u00edstica.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-future-trends-in-leeb-hardness-testing\">Tendencias futuras en los ensayos de dureza seg\u00fan el m\u00e9todo Leeb<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Dispositivos inal\u00e1mbricos y conectados a la nube<\/strong><\/li>\n\n\n\n<li><strong>Interpretaci\u00f3n de datos asistida por IA<\/strong><\/li>\n\n\n\n<li><strong>Sondas de escaneo automatizadas<\/strong><\/li>\n\n\n\n<li><strong>Integraci\u00f3n con gemelos digitales y sistemas de gesti\u00f3n de activos<\/strong><\/li>\n\n\n\n<li><strong>Bases de datos de materiales ampliadas para garantizar la precisi\u00f3n de la conversi\u00f3n<\/strong><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-conclusion\">Conclusi\u00f3n<\/h2>\n\n\n\n<p>El ensayo de dureza Leeb es un m\u00e9todo eficaz, port\u00e1til y eficiente para evaluar la dureza de los metales, especialmente indicado para componentes de gran tama\u00f1o, pesados o instalados sobre el terreno. Su principio de rebote din\u00e1mico permite realizar ensayos r\u00e1pidos y no destructivos en aquellos casos en los que los m\u00e9todos de indentaci\u00f3n convencionales resultan poco pr\u00e1cticos.<\/p>\n\n\n\n<p>Al seguir procedimientos estandarizados, comprender sus limitaciones y aplicar las conversiones adecuadas, los ingenieros e inspectores pueden obtener datos fiables sobre la dureza, esenciales para el control de calidad, el mantenimiento y la caracterizaci\u00f3n de los materiales.<\/p>\n\n\n\n<p>Para obtener instrumentos de ensayo de dureza Leeb de alta precisi\u00f3n y servicios de calibraci\u00f3n, consulte a proveedores de metrolog\u00eda de prestigio que cumplan con <strong>ISO 16859<\/strong>\u200b y proporcionar certificados de calibraci\u00f3n trazables.<\/p>","protected":false},"excerpt":{"rendered":"<p>Introduction to the Leeb Hardness Test The Leeb hardness test\u200b is a dynamic rebound hardness testing method\u200b used to measure<\/p>","protected":false},"author":4,"featured_media":30213,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[117],"tags":[136],"class_list":["post-30604","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-hardness-tester","tag-leeb-hardness-test"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.4 (Yoast SEO v27.4) - 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