{"id":69819,"date":"2026-05-17T17:28:19","date_gmt":"2026-05-17T17:28:19","guid":{"rendered":"https:\/\/evgroupchina.com\/encyclopedia-of-metal\/en-1515\/"},"modified":"2026-05-19T15:31:28","modified_gmt":"2026-05-19T15:31:28","slug":"en-1515","status":"publish","type":"wiki","link":"https:\/\/evgroupchina.com\/en\/encyclopedia-of-metal\/en-1515\/","title":{"rendered":"EN 1515"},"content":{"rendered":"<h2>European Standard EN 1515: Bolted Connections for Flange Assemblies<\/h2>\n<p>The EN 1515 standard regulates the technical requirements for fasteners (bolts, studs, nuts) intended for the assembly of flange connections. Specialists at EV Group China have prepared a structured overview of the main parts of this standard to ensure the correct selection of hardware based on operational loads and temperature conditions.<\/p>\n<ul>\n<li><strong>EN 1515-1:<\/strong> Establishes general criteria for the selection of bolted connections for flanges with nominal pressure (PN) corresponding to the EN 1092 and EN 1759 series.<\/li>\n<li><strong>EN 1515-2:<\/strong> Contains a classification of fastener materials optimized for use with steel flanges according to the EN 1092-1 standard.<\/li>\n<li><strong>EN 1515-3:<\/strong> Defines the nomenclature of bolt products intended for assembly with flange connections according to the EN 1759-1 standard.<\/li>\n<li><strong>EN 1515-4:<\/strong> A specialized part for pressure-bearing equipment, complying with the requirements of Directive 2014\/68\/EU (formerly 97\/23\/EC).<\/li>\n<\/ul>\n<h2>EN 1515-1: Fastener Selection Methodology<\/h2>\n<p>This section of the specification defines geometric parameters, steel grades, and technical delivery conditions for bolts. The standard is focused on flange valves with nominal pressure (PN) and covers operating temperature ranges typical for industrial equipment. EV Group China notes that while standard steel grades are considered during material selection, alternative alloys can be used based on individual project requirements.<\/p>\n<h2>EN 1515-2: Material Classification for EN 1092-1 Flanges<\/h2>\n<p>The regulations in this part describe the compatibility of fastener steels with flange materials according to EN 1092-1. Proper selection of the bolt-flange pair is critical for ensuring joint tightness and preventing galvanic corrosion.<\/p>\n<h2>EN 1515-3: Material Classification for EN 1759-1 Flanges<\/h2>\n<p>This section is dedicated to the selection of steels for bolted fasteners used in flange connections designed according to EN 1759-1 (pressure class) requirements.<\/p>\n<h2>EN 1515-4: Fasteners for Pressure-Bearing Equipment (PED)<\/h2>\n<p>The standard regulates the selection of materials and the structural design of bolted connections for vessels and pipelines subject to the PED Directive. EV Group China emphasizes the importance of adhering to these standards to ensure industrial safety.<\/p>\n<p><em>Note 1:<\/em> When using bolts according to EN 1515-4 with non-standard flanges, the engineer must consider the type of working medium, corrosivity, and the risk of stress relaxation at high temperatures.<\/p>\n<p><em>Note 2:<\/em> In aggressive environments, pressure-bearing equipment may require the use of specialized anti-corrosion coatings for bolted connections.<\/p>\n","protected":false},"featured_media":0,"template":"","meta":[],"wiki_category":[114],"class_list":["post-69819","wiki","type-wiki","status-publish","hentry","wiki_category-en"],"_links":{"self":[{"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/wiki\/69819","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/wiki"}],"about":[{"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/types\/wiki"}],"version-history":[{"count":0,"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/wiki\/69819\/revisions"}],"wp:attachment":[{"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/media?parent=69819"}],"wp:term":[{"taxonomy":"wiki_category","embeddable":true,"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/wiki_category?post=69819"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}