{"id":30955,"date":"2026-06-30T06:28:05","date_gmt":"2026-06-30T06:28:05","guid":{"rendered":"https:\/\/hardnesstests.com\/?p=30955"},"modified":"2026-06-30T06:28:07","modified_gmt":"2026-06-30T06:28:07","slug":"case-depth-hardness-testing","status":"publish","type":"post","link":"https:\/\/hardnesstests.com\/nl\/case-depth-hardness-testing\/","title":{"rendered":"Hardheidsmetingen van de wanddikte van behuizingen: methoden, normen en beste praktijken"},"content":{"rendered":"<h2 class=\"wp-block-heading\" id=\"h-introduction-to-case-depth-hardness-testing\"><strong>Introduction to Case Depth Hardness Testing<\/strong><\/h2>\n\n\n\n<p><strong>Case depth hardness testing<\/strong> is a specialized inspection method used to evaluate the depth and hardness profile of surface-hardened materials. Components that undergo heat treatment processes such as carburizing, carbonitriding, nitriding, induction hardening, or flame hardening are designed with a hard outer layer and a tougher, more ductile core. Measuring the depth of this hardened layer is essential to ensure the component meets design and performance requirements.<\/p>\n\n\n\n<p>Manufacturers rely on case depth hardness testing to verify heat treatment quality, optimize production processes, and maintain consistent product performance. Accurate measurements help prevent premature wear, fatigue failure, and costly downtime in demanding industrial applications.<\/p>\n\n\n\n<p>Today, case depth hardness testing is widely used in the automotive, aerospace, heavy equipment, energy, and tooling industries.<\/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-what-is-case-depth-hardness-testing\"><strong>What Is Case Depth Hardness Testing?<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-definition-and-purpose\"><strong>Definitie en doel<\/strong><\/h3>\n\n\n\n<p><strong>Case depth hardness testing<\/strong> is the process of measuring the hardness profile from the surface of a heat-treated component into its core to determine the thickness of the hardened layer.<\/p>\n\n\n\n<p>De belangrijkste doelstellingen zijn onder meer:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Verifying heat treatment effectiveness<\/li>\n\n\n\n<li>Measuring effective case depth<\/li>\n\n\n\n<li>Determining total case depth<\/li>\n\n\n\n<li>Evaluating hardness gradients<\/li>\n\n\n\n<li>Supporting quality control<\/li>\n\n\n\n<li>Ensuring compliance with engineering specifications<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"450\" height=\"450\" src=\"https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/59.jpg\" alt=\"Case depth hardness testing on carburized steel gear\" class=\"wp-image-30367\" srcset=\"https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/59.jpg 450w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/59-300x300.jpg 300w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/59-150x150.jpg 150w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/59-12x12.jpg 12w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/59-400x400.jpg 400w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-importance-in-heat-treated-components\"><strong>Importance in Heat-Treated Components<\/strong><\/h3>\n\n\n\n<p>A properly hardened case improves:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Slijtvastheid<\/li>\n\n\n\n<li>Vermoeidheidssterkte<\/li>\n\n\n\n<li>Contact durability<\/li>\n\n\n\n<li>Levensduur<\/li>\n<\/ul>\n\n\n\n<p>If the hardened layer is too shallow or too deep, the component may not perform as intended.<\/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-understanding-case-hardening\"><strong>Understanding Case Hardening<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-carburizing\"><strong>Carbureringsproces<\/strong><\/h3>\n\n\n\n<p>Carburizing introduces carbon into the surface of low-carbon steel to create a hard, wear-resistant case while maintaining a tough core.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-carbonitriding\"><strong>Carbonitriding<\/strong><\/h3>\n\n\n\n<p>Carbonitriding diffuses both carbon and nitrogen into the surface, improving hardness and fatigue resistance.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-nitriding\"><strong>Nitreren<\/strong><\/h3>\n\n\n\n<p>Nitriding forms a hard surface layer by diffusing nitrogen into alloy steels at relatively low temperatures.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-induction-hardening\"><strong>Inductieharding<\/strong><\/h3>\n\n\n\n<p>Induction hardening selectively hardens specific areas using electromagnetic heating followed by rapid quenching.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-flame-hardening\"><strong>Flame Hardening<\/strong><\/h3>\n\n\n\n<p>Flame hardening uses localized heating and rapid cooling to harden selected regions of medium- and high-carbon steels.<\/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-why-case-depth-hardness-testing-is-important\"><strong>Why Case Depth Hardness Testing Is Important<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-verifying-heat-treatment-quality\"><strong>Verifying Heat Treatment Quality<\/strong><\/h3>\n\n\n\n<p>Hardness profiles confirm that the heat treatment process has produced the required hardened layer.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-improving-component-performance\"><strong>Improving Component Performance<\/strong><\/h3>\n\n\n\n<p>Proper case depth ensures the correct balance between:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Surface wear resistance<\/li>\n\n\n\n<li>Core toughness<\/li>\n\n\n\n<li>Vermoeidheidssterkte<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-meeting-engineering-specifications\"><strong>Meeting Engineering Specifications<\/strong><\/h3>\n\n\n\n<p>Many industries require documented case depth measurements for product certification and customer acceptance.<\/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-types-of-case-depth\"><strong>Types of Case Depth<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-effective-case-depth\"><strong>Effective Case Depth<\/strong><\/h3>\n\n\n\n<p>Effective case depth is the distance from the surface to the point where hardness decreases to a specified value, commonly <strong>550 HV (approximately 50 HRC)<\/strong> for carburized steels, depending on the applicable standard.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-total-case-depth\"><strong>Total Case Depth<\/strong><\/h3>\n\n\n\n<p>Total case depth represents the entire depth of the chemically or thermally altered surface layer, regardless of hardness.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-hardened-layer-thickness\"><strong>Hardened Layer Thickness<\/strong><\/h3>\n\n\n\n<p>The hardened layer thickness is evaluated by measuring the hardness gradient from the surface into the core material.<\/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-case-depth-hardness-testing-methods\"><strong>Case Depth Hardness Testing Methods<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-microhardness-traverse-testing\"><strong>Microhardness Traverse Testing<\/strong><\/h3>\n\n\n\n<p>Microhardness traverse testing is the preferred method for determining case depth.<\/p>\n\n\n\n<p>A series of indentations is made at precise intervals from the surface toward the core to create a hardness profile.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-vickers-hardness-testing\"><strong>Vickers hardheidsmeting<\/strong><\/h3>\n\n\n\n<p>The Vickers method is widely used because it provides:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Hoge precisie<\/li>\n\n\n\n<li>Uitstekende herhaalbaarheid<\/li>\n\n\n\n<li>Suitable measurements for thin hardened layers<\/li>\n<\/ul>\n\n\n\n<p>Results are reported as <strong>HV<\/strong> values.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-knoop-hardness-testing\"><strong>Knoop hardheidsmeting<\/strong><\/h3>\n\n\n\n<p>Knoop testing is especially suitable for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Very thin cases<\/li>\n\n\n\n<li>Oppervlaktecoatings<\/li>\n\n\n\n<li>Brittle materials<\/li>\n<\/ul>\n\n\n\n<p>Results are reported as <strong>HK<\/strong> values.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-rockwell-surface-hardness-testing\"><strong>Rockwell Surface Hardness Testing<\/strong><\/h3>\n\n\n\n<p>Rockwell testing is often used to verify overall surface hardness but is generally not suitable for measuring effective case depth.<\/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-case-depth-hardness-testing-equipment\"><strong>Case Depth Hardness Testing Equipment<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-microhardness-testers\"><strong>Microhardheidsmeters<\/strong><\/h3>\n\n\n\n<p>Microhardness testers equipped with Vickers or Knoop indenters are the most common systems for case depth analysis.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-metallographic-sample-preparation-equipment\"><strong>Metallografische prepareerapparatuur<\/strong><\/h3>\n\n\n\n<p>Een goede voorbereiding houdt het volgende in:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Sectioning machines<\/li>\n\n\n\n<li>Mounting presses<\/li>\n\n\n\n<li>Grinding systems<\/li>\n\n\n\n<li>Polishing equipment<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-optical-microscopes\"><strong>Optical Microscopes<\/strong><\/h3>\n\n\n\n<p>Microscopes are used to accurately measure indentation dimensions and spacing.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-automated-hardness-mapping-systems\"><strong>Automated Hardness Mapping Systems<\/strong><\/h3>\n\n\n\n<p>Moderne systemen bieden:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Motorized stages<\/li>\n\n\n\n<li>Automatic indentation placement<\/li>\n\n\n\n<li>Hardness profile generation<\/li>\n\n\n\n<li>Digital reporting<\/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-step-by-step-case-depth-hardness-testing-procedure\"><strong>Step-by-Step Case Depth Hardness Testing Procedure<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-sample-sectioning\"><strong>Sample Sectioning<\/strong><\/h3>\n\n\n\n<p>The component is cut perpendicular to the hardened surface to expose the cross-section.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-mounting-and-polishing\"><strong>Mounting and Polishing<\/strong><\/h3>\n\n\n\n<p>The sample is mounted, ground, and polished to obtain a smooth surface suitable for indentation.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-hardness-traverse-measurement\"><strong>Hardness Traverse Measurement<\/strong><\/h3>\n\n\n\n<p>A sequence of microhardness indentations is made from the surface toward the core at predetermined intervals.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-determining-effective-case-depth\"><strong>Determining Effective Case Depth<\/strong><\/h3>\n\n\n\n<p>The hardness profile is analyzed to identify the depth at which hardness falls below the specified limit.<\/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-factors-affecting-test-accuracy\"><strong>Factoren die de nauwkeurigheid van de test be\u00efnvloeden<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-surface-preparation\"><strong>Oppervlaktevoorbereiding<\/strong><\/h3>\n\n\n\n<p>Poor polishing or surface damage can affect indentation quality and measurement accuracy.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-indentation-spacing\"><strong>Indentation Spacing<\/strong><\/h3>\n\n\n\n<p>Indentations should be properly spaced to avoid interaction between plastic deformation zones.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-test-load-selection\"><strong>Test Load Selection<\/strong><\/h3>\n\n\n\n<p>Appropriate loads must be selected according to case thickness and applicable standards.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-calibration-and-verification\"><strong>Kalibratie en verificatie<\/strong><\/h3>\n\n\n\n<p>Routine calibration ensures reliable, repeatable, and traceable results.<\/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=\"800\" height=\"800\" src=\"https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/62.jpg\" alt=\"Case depth hardness testing on carburized steel gear\" class=\"wp-image-30376\" srcset=\"https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/62.jpg 800w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/62-300x300.jpg 300w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/62-150x150.jpg 150w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/62-768x768.jpg 768w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/62-12x12.jpg 12w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/62-400x400.jpg 400w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/62-700x700.jpg 700w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-advantages-of-case-depth-hardness-testing\"><strong>Advantages of Case Depth Hardness Testing<\/strong><\/h2>\n\n\n\n<p>Case depth hardness testing offers several benefits:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Accurate measurement of hardened layer depth<\/li>\n\n\n\n<li>Verification of heat treatment quality<\/li>\n\n\n\n<li>Supports process optimization<\/li>\n\n\n\n<li>Verbetert de betrouwbaarheid van het product<\/li>\n\n\n\n<li>Ensures compliance with specifications<\/li>\n\n\n\n<li>Suitable for a wide range of heat-treated components<\/li>\n\n\n\n<li>Provides detailed hardness profiles<\/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-limitations-of-case-depth-hardness-testing\"><strong>Limitations of Case Depth Hardness Testing<\/strong><\/h2>\n\n\n\n<p>Despite its advantages, some limitations include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Requires destructive sample preparation<\/li>\n\n\n\n<li>Time-consuming compared to surface hardness testing<\/li>\n\n\n\n<li>Specialized equipment and trained personnel are needed<\/li>\n\n\n\n<li>Localized measurements may not represent the entire component<\/li>\n<\/ul>\n\n\n\n<p>Proper sampling procedures help minimize these limitations.<\/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-industrial-applications\"><strong>Industri\u00eble toepassingen<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-automotive-gears\"><strong>Automotive Gears<\/strong><\/h3>\n\n\n\n<p>Case depth testing verifies the hardened layer of transmission gears, pinions, and differential components.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-bearings-and-shafts\"><strong>Bearings and Shafts<\/strong><\/h3>\n\n\n\n<p>Manufacturers evaluate wear-resistant surfaces while maintaining tough cores.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-aerospace-components\"><strong>Ruimtevaart Onderdelen<\/strong><\/h3>\n\n\n\n<p>Critical aerospace parts require strict case depth verification to ensure fatigue resistance and reliability.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-heavy-equipment\"><strong>Heavy Equipment<\/strong><\/h3>\n\n\n\n<p>Construction and mining machinery rely on properly hardened components for extended service life.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-tool-and-die-manufacturing\"><strong>Productie van gereedschappen en matrijzen<\/strong><\/h3>\n\n\n\n<p>Case depth testing helps maintain consistent hardness and wear resistance in tooling applications.<\/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-industry-standards-and-compliance\"><strong>Industriestandaarden en naleving<\/strong><\/h2>\n\n\n\n<p>Algemene normen voor <strong>hardheidsmeting op diepte van de behuizing<\/strong> omvatten:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>ASTM E384 (Microhardness Testing)<\/li>\n\n\n\n<li>ASTM A255 (Hardenability of Steel)<\/li>\n\n\n\n<li>ISO 6507 (Vickers Hardness)<\/li>\n\n\n\n<li>ISO 2639 (Determination of Carburized and Hardened Case Depth)<\/li>\n\n\n\n<li>SAE J423 (Case Depth Measurement Guidelines)<\/li>\n<\/ul>\n\n\n\n<p>Offici\u00eble bronnen:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.astm.org\/?utm_source=chatgpt.com\" target=\"_blank\" rel=\"noreferrer noopener\">ASTM International<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.iso.org\/?utm_source=chatgpt.com\" target=\"_blank\" rel=\"noreferrer noopener\">ISO-normalisatieorganisatie<\/a><\/li>\n<\/ul>\n\n\n\n<p>Compliance with these standards ensures consistent and internationally recognized testing procedures.<\/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-frequently-asked-questions\"><strong>Veelgestelde vragen<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-1-what-is-case-depth-hardness-testing\"><strong>1. What is case depth hardness testing?<\/strong><\/h3>\n\n\n\n<p>It is a method used to measure the hardness profile and determine the depth of a hardened surface layer after heat treatment.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-2-what-is-effective-case-depth\"><strong>2. What is effective case depth?<\/strong><\/h3>\n\n\n\n<p>Effective case depth is the distance from the surface to the point where hardness decreases to a specified value defined by the applicable standard.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-3-which-hardness-test-is-commonly-used-for-case-depth-measurement\"><strong>3. Which hardness test is commonly used for case depth measurement?<\/strong><\/h3>\n\n\n\n<p>Microhardness testing using the Vickers method is the most widely accepted technique.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-4-is-case-depth-hardness-testing-destructive\"><strong>4. Is case depth hardness testing destructive?<\/strong><\/h3>\n\n\n\n<p>Yes. It usually requires sectioning and polishing the component to expose its cross-section.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-5-which-industries-use-case-depth-hardness-testing\"><strong>5. Which industries use case depth hardness testing?<\/strong><\/h3>\n\n\n\n<p>Automotive, aerospace, heavy equipment, tooling, energy, and industrial manufacturing.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-6-why-is-case-depth-important\"><strong>6. Why is case depth important?<\/strong><\/h3>\n\n\n\n<p>Proper case depth ensures the correct balance of surface wear resistance and core toughness, improving component performance and service life.<\/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-conclusion\"><strong>Conclusie<\/strong><\/h2>\n\n\n\n<p><strong>Case depth hardness testing<\/strong> is a critical quality assurance technique for evaluating heat-treated components. By accurately measuring the hardness profile from the surface to the core, manufacturers can verify heat treatment effectiveness, optimize production processes, and ensure compliance with engineering standards.<\/p>\n\n\n\n<p>Whether inspecting carburized gears, nitrided shafts, induction-hardened bearings, or flame-hardened industrial parts, case depth hardness testing provides the reliable data needed to improve durability, safety, and long-term performance.<\/p>","protected":false},"excerpt":{"rendered":"<p>Introduction to Case Depth Hardness Testing Case depth hardness testing is a specialized inspection method used to evaluate the depth<\/p>","protected":false},"author":4,"featured_media":30344,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[117],"tags":[149],"class_list":["post-30955","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-hardness-tester","tag-case-depth-hardness-testing"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.4 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Case Depth Hardness Testing: Methods, Standards and Best Practices<\/title>\n<meta name=\"description\" content=\"Learn about case depth hardness testing, including testing methods, hardness traverse procedures, effective case depth measurement.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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