{"id":8603,"date":"2026-02-09T17:48:44","date_gmt":"2026-02-09T15:48:44","guid":{"rendered":"https:\/\/mfinox.com\/honeycomb-corrosion-how-to-interpret-it-according-to-astm-g48-and-astm-a262-standards\/"},"modified":"2026-02-09T17:48:44","modified_gmt":"2026-02-09T15:48:44","slug":"honeycomb-corrosion-how-to-interpret-it-according-to-astm-g48-and-astm-a262-standards","status":"publish","type":"post","link":"https:\/\/mfinox.com\/en\/honeycomb-corrosion-how-to-interpret-it-according-to-astm-g48-and-astm-a262-standards\/","title":{"rendered":"Honeycomb corrosion: how to interpret it according to ASTM G48 and ASTM A262 standards"},"content":{"rendered":"<article>\n<header><em>Localized corrosion is one of the most insidious mechanisms for stainless steels and special alloys: recognizing and preventing it is essential for plant reliability.<\/em><\/header>\n<section>\n<h2>What is honeycomb corrosion<\/h2>\n<p><strong>Honeycomb corrosion<\/strong>, often likened to the phenomenon of <strong>pitting<\/strong>, is a form of localized corrosion that manifests itself through small point attacks or cavities on the surface of the material. Unlike uniform corrosion, this type of degradation can progress in depth without obvious signs, leading to <strong>sudden perforations<\/strong> and structural failure. <\/p>\n<p>This is a typical phenomenon for <strong>stainless steels<\/strong> and corrosion-resistant alloys when operating in environments containing <strong>chlorides<\/strong>, salt solutions or aggressive chemical conditions.<\/p>\n<\/section>\n<hr>\n<section>\n<h2>Why honeycomb corrosion is critical in fastening systems<\/h2>\n<p>In <strong>fastening systems<\/strong>, honeycomb corrosion is a high risk because: <\/p>\n<ul>\n<li>Dramatically reduces the <strong>resistant section of<\/strong> the bolt or screw;<\/li>\n<li>can trigger in areas that are difficult to inspect, such as <strong>threads<\/strong> and contact surfaces;<\/li>\n<li>leads to sudden failures without warning;<\/li>\n<li>makes even proper mechanical sizing ineffective.<\/li>\n<\/ul>\n<p>Therefore, honeycomb corrosion resistance is a key parameter when selecting materials for <strong>offshore<\/strong>, <strong>marine<\/strong>, <strong>chemical<\/strong> and <strong>energy<\/strong> applications.<\/p>\n<\/section>\n<hr>\n<section>\n<h2>The ASTM G48 standard: pitting and crevice corrosion resistance test<\/h2>\n<p><strong>ASTM G48<\/strong> is one of the most widely used reference standards for evaluating the <strong>alveolar and crevice corrosion resistance<\/strong> of stainless, duplex and super duplex steels.<\/p>\n<p>The test involves exposing the material to a temperature-controlled <strong>ferric chloride solution<\/strong> for a defined period of time. At the end of the test, it is evaluated: <\/p>\n<ul>\n<li>The presence of <strong>localized attacks<\/strong>;<\/li>\n<li>the <strong>loss of mass<\/strong>;<\/li>\n<li>The depth and distribution of the alveoli.<\/li>\n<\/ul>\n<p>ASTM G48 is particularly suitable for comparing materials such as. <a href=\"https:\/\/mfinox.com\/en\/materials\/stainless-steel-werkstoff-1-4401-aisi-316-uns-s31600-2\/\"><strong>AISI 316L<\/strong><\/a>, <a href=\"https:\/\/mfinox.com\/en\/materials\/stainless-steel-aisi-904l-uns-n08904-w-1-4539-3\/\"><strong>904L<\/strong><\/a> e <a href=\"https:\/\/mfinox.com\/en\/materials\/super-duplex-a182-f53-uns-<a href=\"https:\/\/mfinox.com\/en\/materials\/super-duplex-a182-f53-uns-s32750-w-1-4410-saf-2507\/\" style=\"text-decoration: underline;\">s32750<\/a>-w-1-4410-saf-2507\/\"><strong>super duplex UNS <a href=\"https:\/\/mfinox.com\/en\/materials\/super-duplex-a182-f53-uns-s32750-w-1-4410-saf-2507\/\" style=\"text-decoration: underline;\">S32750<\/a><\/strong><\/a> in terms of actual behavior in chlorinated environments.<\/p>\n<\/section>\n<hr>\n<section>\n<h2>The ASTM A262 standard: intergranular corrosion and sensitization<\/h2>\n<p><strong>ASTM A262<\/strong> is a standard focused on the evaluation of <strong>intergranular corrosion<\/strong>, a different but closely related phenomenon to honeycomb corrosion in terms of material reliability.<\/p>\n<p>This standard is used to check whether a stainless steel is <strong>sensitized<\/strong>, that is, susceptible to preferential corrosion along grain boundaries, often as a result of improper heat treatment or welding.<\/p>\n<p>A material that passes ASTM A262 tests also offers greater assurance against the initiation of localized corrosion under real operating conditions.<\/p>\n<\/section>\n<hr>\n<section>\n<h2>Comparison of ASTM G48 and ASTM A262<\/h2>\n<table style=\"width: 100%; border-collapse: collapse; text-align: left;\" border=\"1\" cellspacing=\"0\" cellpadding=\"10\">\n<thead>\n<tr style=\"background-color: #f2f2f2;\">\n<th>Standard<\/th>\n<th>Type of corrosion evaluated<\/th>\n<th>Test objective<\/th>\n<th>Typical application<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>ASTM G48<\/strong><\/td>\n<td>Honeycomb \/ pitting \/ crack<\/td>\n<td>Resistance in chlorinated environments<\/td>\n<td>Offshore, marine, chemical<\/td>\n<\/tr>\n<tr>\n<td><strong>ASTM A262<\/strong><\/td>\n<td>Intergranular<\/td>\n<td>Sensitization Verification.<\/td>\n<td>Welded components, austenitic stainless<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/section>\n<hr>\n<section>\n<h2>More suitable materials against honeycomb corrosion<\/h2>\n<p>Honeycomb corrosion resistance is highly dependent on the chemical composition of the material, particularly the <strong>chromium<\/strong>, <strong>molybdenum<\/strong> and <strong>nitrogen<\/strong> content (PREN value).<\/p>\n<p>Some of the most widely used materials to counteract this phenomenon include:<\/p>\n<ul>\n<li><a href=\"https:\/\/mfinox.com\/en\/materials\/stainless-steel-werkstoff-1-4401-aisi-316-uns-s31600-2\/\"><strong>AISI 316 \/ 316L<\/strong><\/a> &#8211; Suitable for moderate conditions;<\/li>\n<li><a href=\"https:\/\/mfinox.com\/en\/materials\/stainless-steel-aisi-904l-uns-n08904-w-1-4539-3\/\"><strong>904L<\/strong><\/a> &#8211; High resistance in acid and chlorinated environments;<\/li>\n<li><a href=\"https:\/\/mfinox.com\/en\/materials\/super-duplex-a182-f53-uns-s32750-w-1-4410-saf-2507\/\"><strong>Super duplex UNS S32750<\/strong><\/a> &#8211; Excellent resistance to pitting and cracking;<\/li>\n<li><a href=\"https:\/\/mfinox.com\/en\/materials\/super-duplex-a182-f55-uns-s32760-werkstoff-1-4501\/\"><strong>Super duplex UNS S32760<\/strong><\/a> &#8211; Suitable for extremely aggressive environments.<\/li>\n<\/ul>\n<\/section>\n<footer>\n<h2>Conclusion<\/h2>\n<p><strong>Honeycomb corrosion<\/strong> is a major risk factor for the durability of stainless steels and fastener systems in aggressive environments. <strong>ASTM G48<\/strong> and <strong>ASTM A262<\/strong> standards are key tools for evaluating material behavior and preventing critical failures. <\/p>\n<p>Correct interpretation of these tests, coupled with the selection of the appropriate material, enables the design of safer, more reliable and long-lasting implants.<\/p>\n<\/footer>\n<\/article>\n","protected":false},"excerpt":{"rendered":"<p>Localized corrosion is one of the most insidious mechanisms for stainless steels and special alloys: recognizing and preventing it is essential for plant reliability. What is honeycomb corrosion Honeycomb corrosion, often likened to the phenomenon of pitting, is a form of localized corrosion that manifests itself through small point attacks or cavities on the surface [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":8602,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-8603","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-non-categorizzato"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Honeycomb corrosion: how to interpret it according to ASTM G48 and ASTM A262 standards - M.F. 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