{"id":4553,"date":"2023-03-10T10:01:00","date_gmt":"2023-03-10T15:01:00","guid":{"rendered":"https:\/\/dev26.lecowebtest.com\/news\/\/"},"modified":"2026-05-20T11:54:45","modified_gmt":"2026-05-20T15:54:45","slug":"the-hard-truth-of-conversions-astm-e140","status":"publish","type":"post","link":"https:\/\/dev26.lecowebtest.com\/ja\/news\/the-hard-truth-of-conversions-astm-e140\/","title":{"rendered":"The Hard Truth of Conversions: ASTM E140"},"content":{"rendered":"<div class=\"wp-block-group is-style-leco-vertical-margin-top has-global-padding is-layout-constrained wp-container-core-group-is-layout-182edfea wp-block-group-is-layout-constrained\">\n<div class=\"wp-block-group is-nowrap is-layout-flex wp-container-core-group-is-layout-c0d5ccf6 wp-block-group-is-layout-flex\">\n<p>Published on<\/p>\n\n\n<div style=\"line-height:1; margin-left:4px;margin-top:13px;\" class=\"wp-block-post-date has-custom-1-font-size\"><time datetime=\"2023-03-10T10:01:00-05:00\">10 3\u6708 2023<\/time><\/div><\/div>\n\n\n\n<h1 class=\"wp-block-heading is-style-h2-style\">The Hard Truth of Conversions: ASTM E140<\/h1>\n<\/div>\n\n\n\n<div class=\"wp-block-group has-global-padding is-layout-constrained wp-block-group-is-layout-constrained\"><figure class=\"is-style-rounded wp-block-post-featured-image\"><img loading=\"lazy\" decoding=\"async\" width=\"1280\" height=\"720\" src=\"https:\/\/dev26.lecowebtest.com\/wp-content\/uploads\/2023\/03\/steel-structure-bridge-or-structure.webp\" class=\"attachment-post-thumbnail size-post-thumbnail wp-post-image\" alt=\"Steel bridge\" style=\"object-fit:cover;\" srcset=\"https:\/\/dev26.lecowebtest.com\/wp-content\/uploads\/2023\/03\/steel-structure-bridge-or-structure.webp 1280w, https:\/\/dev26.lecowebtest.com\/wp-content\/uploads\/2023\/03\/steel-structure-bridge-or-structure-300x169.webp 300w, https:\/\/dev26.lecowebtest.com\/wp-content\/uploads\/2023\/03\/steel-structure-bridge-or-structure-1024x576.webp 1024w, https:\/\/dev26.lecowebtest.com\/wp-content\/uploads\/2023\/03\/steel-structure-bridge-or-structure-768x432.webp 768w, https:\/\/dev26.lecowebtest.com\/wp-content\/uploads\/2023\/03\/steel-structure-bridge-or-structure-18x10.webp 18w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\"><\/figure><\/div>\n\n\n\n<div class=\"wp-block-group has-global-padding is-layout-constrained wp-container-core-group-is-layout-c631bffc wp-block-group-is-layout-constrained\" style=\"margin-top:48px\">\n<div class=\"leco-share-article align-left wp-block-create-block-leco-share-article\">\n\t<div class=\"share-article-wrapper\">\n\t\t<button class=\"share-article-button\" data-url=\"https:\/\/dev26.lecowebtest.com\/ja\/news\/the-hard-truth-of-conversions-astm-e140\/\" aria-label=\"Share Article\">\n\t\t\tShare Article\t\t<\/button>\n\t\t<span class=\"share-article-copied\" aria-live=\"polite\" aria-atomic=\"true\">\n\t\t\tArticle Link Copied\t\t<\/span>\n\t<\/div>\n<\/div>\n\n\n<div class=\"wp-block-group has-global-padding is-layout-constrained wp-block-group-is-layout-constrained\" style=\"margin-top:0\">\n<hr class=\"wp-block-separator has-text-color has-sl-1-color has-alpha-channel-opacity has-sl-1-background-color has-background has-base-100-color has-base-100-background-color is-style-default\" style=\"margin-top:60px;margin-bottom:60px\">\n<\/div>\n\n\n\n<p>The Rockwell hardness test is one of the fastest and most convenient hardness testing methods used around the world. With the lack of sample prep and optical requirements, it is the easiest to work into automated production lines, and the common Rockwell hardness scale C (HRC) is an easy way to refer to the hardness of metals that even the lay person can understand. However, it is not the only hardness testing method. Knoop (HK) and Vickers (HV) hardness testing methods can also find the hardness of a material, but the values are not interchangeable. To compare material hardness, the values must be in the same hardness scale.<\/p>\n\n\n\n<div class=\"wp-block-group has-global-padding is-layout-constrained wp-block-group-is-layout-constrained\">\n<figure class=\"wp-block-image size-full is-resized is-style-rounded-full-width\"><img loading=\"lazy\" decoding=\"async\" width=\"384\" height=\"256\" src=\"https:\/\/dev26.lecowebtest.com\/wp-content\/uploads\/2026\/04\/leco-news-the-hard-truth-of-conversions-astm-e140-lab-test-041626.webp\" alt=\"LECO - News - The Hard Truth of Conversions ASTM E140 - Lab test\" class=\"wp-image-4148\" style=\"width:786px;height:auto\" srcset=\"https:\/\/dev26.lecowebtest.com\/wp-content\/uploads\/2026\/04\/leco-news-the-hard-truth-of-conversions-astm-e140-lab-test-041626.webp 384w, https:\/\/dev26.lecowebtest.com\/wp-content\/uploads\/2026\/04\/leco-news-the-hard-truth-of-conversions-astm-e140-lab-test-041626-300x200.webp 300w, https:\/\/dev26.lecowebtest.com\/wp-content\/uploads\/2026\/04\/leco-news-the-hard-truth-of-conversions-astm-e140-lab-test-041626-18x12.webp 18w\" sizes=\"auto, (max-width: 384px) 100vw, 384px\" \/><\/figure>\n<\/div>\n\n\n\n<p>Rockwell hardness testing has a lot of advantages over the other testing methods, primarily with the speed of testing. That being said, there are some materials that cannot be tested with a Rockwell method. Small, thin, or fragile samples needs Knoop or Vickers testing for an accurate measurement.<\/p>\n\n\n\n<p>ASTM E140 is a standard for hardness conversion tables. It includes many different materials and conversion numbers between various testing methods as well as equations for using these conversions. In theory, you should be able to find your material, plug your numbers and the conversion number into the appropriate equation, and be able to convert your hardness values between scales with perfect accuracy. In practice, however, these tables are not nearly that precise.<\/p>\n\n\n\n<p>Material hardness is a combination of various properties of said materials. Not every nickel alloy, for example, is going to have the exact same hardness due to material alloy, grain structure, heat treatment, and more. The values in the ASTM E140 tables are all <em>approximate<\/em>, calculated from testing done many years ago, some even on equipment that is no longer used today, and called out as such in every table title. Beginning with an approximate conversion value means that the actual calculated conversion, by its very definition, must also be approximate. It is impossible to calculate an exact conversion using ASTM E140.<\/p>\n\n\n\n<p>Nevertheless, sometimes conversions do need to be made using the tables in this specification. An engineering drawing or material specification may call out a Rockwell hardness requirement that is impossible to measure on the sample at hand. This is where the conversion tables are useful, but when conversions are made, the conversion must be clearly stated on any data reporting.<\/p>\n\n\n\n<div class=\"wp-block-group has-global-padding is-layout-constrained wp-block-group-is-layout-constrained\">\n<figure class=\"wp-block-image size-full is-style-rounded-full-width\"><img loading=\"lazy\" decoding=\"async\" width=\"416\" height=\"276\" src=\"https:\/\/dev26.lecowebtest.com\/wp-content\/uploads\/2026\/04\/leco-news-the-hard-truth-of-conversions-astm-e140-testers-041626.jpg\" alt=\"LECO - News - The Hard Truth of Conversions ASTM E140 - Testers\" class=\"wp-image-4149\" srcset=\"https:\/\/dev26.lecowebtest.com\/wp-content\/uploads\/2026\/04\/leco-news-the-hard-truth-of-conversions-astm-e140-testers-041626.jpg 416w, https:\/\/dev26.lecowebtest.com\/wp-content\/uploads\/2026\/04\/leco-news-the-hard-truth-of-conversions-astm-e140-testers-041626-300x199.jpg 300w, https:\/\/dev26.lecowebtest.com\/wp-content\/uploads\/2026\/04\/leco-news-the-hard-truth-of-conversions-astm-e140-testers-041626-18x12.jpg 18w\" sizes=\"auto, (max-width: 416px) 100vw, 416px\" \/><\/figure>\n<\/div>\n\n\n\n<p>The unfortunate truth is that hardness testing values cannot be converted accurately between methods, and the best practice is to always use the correct hardness test for the method being used. Hardness testing doesn\u2019t need to be difficult, though. LECO\u2019s <a href=\"https:\/\/dev26.lecowebtest.com\/ja\/instrument\/amh55-%e8%87%aa%e5%8b%95%e7%a1%ac%e3%81%95%e8%a9%a6%e9%a8%93\/\" target=\"_blank\" data-type=\"instrument\" data-id=\"2232\" rel=\"noreferrer noopener\">AMH55 <\/a>hardness testing system is capable of automating the process for Knoop or Vickers testing that is just as easy to use as a Rockwell hardness tester. Learn more about the AMH55 and LECO\u2019s <a href=\"https:\/\/dev26.lecowebtest.com\/ja\/%e9%87%91%e5%b1%9e%e7%b5%84%e7%b9%94%e5%ad%a6\/\" data-type=\"page\" data-id=\"2367\">start-to-finish metallographic solution<\/a> today.<\/p>\n\n\n\n<div class=\"wp-block-group has-global-padding is-layout-constrained wp-block-group-is-layout-constrained\" style=\"margin-top:0\">\n<hr class=\"wp-block-separator has-text-color has-sl-1-color has-alpha-channel-opacity has-sl-1-background-color has-background has-base-100-color has-base-100-background-color is-style-default\" style=\"margin-top:60px;margin-bottom:60px\">\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading is-style-h4-style\">Instruments Used<\/h3>\n\n\n\n<div class=\"leco-card-grid-block wp-block-create-block-leco-card-grid\">\n\t<div class=\"leco-card-grid columns-2\" role=\"list\" aria-label=\"Card grid\">\n\t\t\n\t\t\t\t\t<a href=\"https:\/\/dev26.lecowebtest.com\/ja\/%e6%9b%b8%e9%a1%9e\/209-246\/\" class=\"leco-card\" role=\"listitem\" aria-label=\"AMH55 Hardness Testing System - Click to learn more\">\n\t\t\n\t\t\t<!-- Card Image -->\n\t\t\t<div class=\"leco-card-image\" role=\"img\" aria-label=\"AMH55 Hardness Testing System\">\n\t\t\t\t\t\t\t\t\t<img src=\"https:\/\/dev26.lecowebtest.com\/wp-content\/uploads\/2026\/01\/amh55-automated-hardness-testers.jpg\" srcset=\"https:\/\/dev26.lecowebtest.com\/wp-content\/uploads\/2026\/01\/amh55-automated-hardness-testers.jpg 1024w, https:\/\/dev26.lecowebtest.com\/wp-content\/uploads\/2026\/01\/amh55-automated-hardness-testers.jpg 768w, https:\/\/dev26.lecowebtest.com\/wp-content\/uploads\/2026\/01\/amh55-automated-hardness-testers-300x199.jpg 300w, https:\/\/dev26.lecowebtest.com\/wp-content\/uploads\/2026\/01\/amh55-automated-hardness-testers.jpg 416w\" sizes=\"(max-width: 768px) 100vw, (max-width: 1200px) 50vw, 371px\" alt=\"AMH55 Hardness Testing System\" class=\"leco-card-img\" loading=\"lazy\" decoding=\"sync\">\n\t\t\t\t\t\t\t<\/div>\n\n\t\t\t<!-- Card Content -->\n\t\t\t<div class=\"leco-card-content\">\n\t\t\t\t\t\t\t\t\t<h3 class=\"leco-card-title\">\n\t\t\t\t\t\tAMH55 Hardness Testing System\t\t\t\t\t<\/h3>\n\t\t\t\t\n\t\t\t\t<div class=\"leco-card-bottom\">\n\t\t\t\t\t\t\t\t\t\t\t<p class=\"leco-card-description\">\n\t\t\t\t\t\t\tThe AMH55 delivers fully automated micro\u2011 and macro\u2011indentation testing with fast, consistent results across high\u2011volume workflows.\t\t\t\t\t\t<\/p>\n\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t<div class=\"leco-card-link\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t<svg class=\"leco-card-arrow\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"44\" height=\"44\" viewbox=\"0 0 44 44\" fill=\"none\" focusable=\"false\">\n\t\t\t\t\t\t\t\t<path d=\"M12.7998 22C12.7998 22.5523 13.2475 23 13.7998 23L27.3857 23L21.7998 28.5859C21.4093 28.9764 21.4093 29.6095 21.7998 30C22.1903 30.3905 22.8234 30.3905 23.2139 30L30.5068 22.7071C30.8973 22.3166 30.8973 21.6834 30.5068 21.2929L23.2139 14C22.8234 13.6095 22.1903 13.6095 21.7998 14C21.4093 14.3905 21.4093 15.0236 21.7998 15.4141L27.3857 21L13.7998 21C13.2475 21 12.7998 21.4477 12.7998 22Z\" fill=\"#78543D\"><\/path>\n\t\t\t\t\t\t\t<\/svg>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t<\/div>\n\n\t\t\t\t\t<\/a>\n\t\t\n\t\t\t<\/div>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-group has-global-padding is-layout-constrained wp-block-group-is-layout-constrained\">\n<div class=\"wp-block-group is-style-full-bleed has-global-padding is-layout-constrained wp-block-group-is-layout-constrained\">\n<div class=\"wp-block-group has-global-padding is-layout-constrained wp-block-group-is-layout-constrained\" style=\"margin-top:0\">\n<hr class=\"wp-block-separator has-text-color has-sl-1-color has-alpha-channel-opacity has-sl-1-background-color has-background has-base-100-color has-base-100-background-color is-style-default\" style=\"margin-top:60px;margin-bottom:60px\">\n<\/div>\n\n\n\n<h4 class=\"wp-block-heading is-style-h4-style\">Related 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1280px\"><\/a><\/figure>\n\n<h4 style=\"font-style:normal;font-weight:300;\" class=\"has-link-color wp-elements-25e6d450634c6f6ce866507b40ad7ad3 wp-block-post-title has-text-color has-dm-8-color has-medium-font-size has-rothek-font-family\"><a href=\"https:\/\/dev26.lecowebtest.com\/ja\/news\/sample-preparation-aluminum-alloys\/\" target=\"_self\">\u30a2\u30eb\u30df\u30cb\u30a6\u30e0\u304a\u3088\u3073\u30a2\u30eb\u30df\u30cb\u30a6\u30e0\u5408\u91d1\u306e\u8a66\u6599\u8abf\u88fd<\/a><\/h4>\n\n<div class=\"wp-block-post-date\"><time datetime=\"2026-05-27T08:55:10-04:00\">2026\u5e745\u670827\u65e5<\/time><\/div><\/div>\n\n<\/li><\/ul><\/div>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Published on The Hard Truth of Conversions: ASTM E140 The Rockwell hardness test is one of the fastest and most convenient hardness testing methods used around the world. With the lack of sample prep and optical requirements, it is the easiest to work into automated production lines, and the common Rockwell hardness scale C (HRC) is an easy way to refer to the hardness of metals that even the lay person can understand. However, it is not the only hardness testing method. Knoop (HK) and Vickers (HV) hardness testing methods can also find the hardness of a material, but the values are not interchangeable. To compare material hardness, the values [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":5200,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"instrument-model":[62],"core-analysis-type":[29],"application-type":[],"product-line":[53,16],"class_list":["post-4553","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","instrument-model-amh55","core-analysis-type-sample-prep-hardness-testing","product-line-hardness-testing","product-line-metallography"],"_links":{"self":[{"href":"https:\/\/dev26.lecowebtest.com\/ja\/wp-json\/wp\/v2\/posts\/4553","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dev26.lecowebtest.com\/ja\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dev26.lecowebtest.com\/ja\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dev26.lecowebtest.com\/ja\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/dev26.lecowebtest.com\/ja\/wp-json\/wp\/v2\/comments?post=4553"}],"version-history":[{"count":0,"href":"https:\/\/dev26.lecowebtest.com\/ja\/wp-json\/wp\/v2\/posts\/4553\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/dev26.lecowebtest.com\/ja\/wp-json\/wp\/v2\/media\/5200"}],"wp:attachment":[{"href":"https:\/\/dev26.lecowebtest.com\/ja\/wp-json\/wp\/v2\/media?parent=4553"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dev26.lecowebtest.com\/ja\/wp-json\/wp\/v2\/categories?post=4553"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dev26.lecowebtest.com\/ja\/wp-json\/wp\/v2\/tags?post=4553"},{"taxonomy":"instrument-model","embeddable":true,"href":"https:\/\/dev26.lecowebtest.com\/ja\/wp-json\/wp\/v2\/instrument-model?post=4553"},{"taxonomy":"core-analysis-type","embeddable":true,"href":"https:\/\/dev26.lecowebtest.com\/ja\/wp-json\/wp\/v2\/core-analysis-type?post=4553"},{"taxonomy":"application-type","embeddable":true,"href":"https:\/\/dev26.lecowebtest.com\/ja\/wp-json\/wp\/v2\/application-type?post=4553"},{"taxonomy":"product-line","embeddable":true,"href":"https:\/\/dev26.lecowebtest.com\/ja\/wp-json\/wp\/v2\/product-line?post=4553"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}