{"id":8883,"date":"2024-11-18T17:15:21","date_gmt":"2024-11-18T17:15:21","guid":{"rendered":"https:\/\/www.h-metal.ro\/blog\/?p=8883"},"modified":"2024-11-18T17:15:22","modified_gmt":"2024-11-18T17:15:22","slug":"classes-of-steel","status":"publish","type":"post","link":"https:\/\/www.h-metal.ro\/blog\/en\/classes-of-steel\/","title":{"rendered":"Brands and grades of construction steel"},"content":{"rendered":"<p>For those who are not very familiar with all the technical details in the field of construction steels, the following question arises: &#8222;How do we correctly interpret the notation of some brands and classes of <a href=\"https:\/\/www.metal-online.ro\/otel&amp;100\">steel <\/a>defined in letters and numbers?&#8221;<\/p>\n\n\n\n<p>The quality standards of construction steels according to EN 10025-2\/2004 are the following:<\/p>\n\n\n\n<p>S185<\/p>\n\n\n\n<p>S235JR S235JO S235J2<\/p>\n\n\n\n<p>S275JR S275JO S275J2<\/p>\n\n\n\n<p>S355JR S355JO S235J2 S355K2<\/p>\n\n\n\n<p>This alphanumeric symbolization includes the steel brand (S185, S235, S275, S355) and the corresponding quality class (JR, JO, J2, K2).<\/p>\n\n\n\n<h2>Brands and classes of steel &#8211; their description<\/h2>\n\n\n\n<p>The <strong>steel mark <\/strong>contains the symbol S (which refers to the steel group &#8211; construction steel) and the number 185, 235, 275 or 355 which expresses the minimum value of the expressed yield strength. Steel brands differ from each other in mechanical characteristics.<\/p>\n\n\n\n<p>Within each steel brand, several <strong>quality classes<\/strong> are defined:<\/p>\n\n\n\n<p><strong>JR<\/strong> \u2013 quality class for products with the minimum value of breaking energy when bending by shock of 27J at +20 degrees C.<\/p>\n\n\n\n<p><strong>JO<\/strong> \u2013 quality class for products with the minimum value of breaking energy when bending by shock of 27J at 0 degrees C.<\/p>\n\n\n\n<p><strong>J2<\/strong> \u2013 quality class for products with the minimum value of breaking energy when bending by shock of 27J at -20 degrees C.<\/p>\n\n\n\n<p><strong>K2<\/strong> \u2013 quality class for products with the minimum value of breaking energy when bending by shock of 40J at -20 degrees C.<\/p>\n\n\n\n<p>The quality classes, which differentiate the steels within the same brands. These highlight, on the one hand, good welding behavior. And on the other hand, the safety of welds and welded parts, by ensuring toughness and avoiding brittle breaks. The steels of the quality classes JR, JO, J2 and K2 generally have welding capacity for all welding processes. Weldability increases from JR to K2.<\/p>\n\n\n\n<p>Not all <a href=\"https:\/\/www.h-metal.ro\/blog\/en\/multiple-types-of-steel\/\">types of steel <\/a>are weldable. The chemical composition of the alloy influences its behavior during welding. The higher the carbon content in the chemical composition of the steel, the more delicate the welding becomes.<\/p>\n\n\n\n<p>When choosing the quality class of steel, when executing welded metal constructions, you must take into account:<\/p>\n\n\n\n<p>&#8211; the nature of the requests;<\/p>\n\n\n\n<p>\u2013 the thickness of the product;<\/p>\n\n\n\n<p>&#8211; the construction temperature.<\/p>\n\n\n\n<p>Similar articles:<\/p>\n\n\n\n<p><a href=\"https:\/\/www.h-metal.ro\/blog\/en\/\">The difference between OL 37 and OL 52<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.h-metal.ro\/blog\/en\/\">Why is steel used in construction?<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.h-metal.ro\/blog\/en\/\">Hot rolling vs. cold rolling<\/a><\/p>\n<div style=\"padding-bottom:20px; padding-top:10px;\" class=\"hupso-share-buttons\"><!-- Hupso Share Buttons - http:\/\/www.hupso.com\/share\/ --><a class=\"hupso_toolbar\" href=\"http:\/\/www.hupso.com\/share\/\"><img src=\"https:\/\/static.hupso.com\/share\/buttons\/share-medium.png\" style=\"border:0px; padding-top:5px; float:left;\" alt=\"Share\"\/><\/a><script type=\"text\/javascript\">var hupso_services_t=new Array(\"Twitter\",\"Facebook\",\"Google Plus\",\"Linkedin\",\"StumbleUpon\",\"Digg\",\"Reddit\",\"Bebo\",\"Delicious\"); var hupso_toolbar_size_t=\"medium\";var hupso_url_t=\"\";var hupso_title_t=\"Brands and grades of construction steel\";<\/script><script type=\"text\/javascript\" src=\"https:\/\/static.hupso.com\/share\/js\/share_toolbar.js\"><\/script><!-- Hupso Share Buttons --><\/div>","protected":false},"excerpt":{"rendered":"<p>For those who are not very familiar with all the technical details in the field of construction steels, the following question arises: &#8222;How do we correctly interpret the notation of some brands and classes of steel defined in letters and numbers?&#8221; The quality standards of construction steels according to EN 10025-2\/2004 are the following: S185 [&hellip;]<\/p>\n<div style=\"padding-bottom:20px; padding-top:10px;\" class=\"hupso-share-buttons\"><!-- Hupso Share Buttons - http:\/\/www.hupso.com\/share\/ --><a class=\"hupso_toolbar\" href=\"http:\/\/www.hupso.com\/share\/\"><img src=\"https:\/\/static.hupso.com\/share\/buttons\/share-medium.png\" style=\"border:0px; padding-top:5px; float:left;\" alt=\"Share\"\/><\/a><script type=\"text\/javascript\">var hupso_services_t=new Array(\"Twitter\",\"Facebook\",\"Google Plus\",\"Linkedin\",\"StumbleUpon\",\"Digg\",\"Reddit\",\"Bebo\",\"Delicious\"); var hupso_toolbar_size_t=\"medium\";var hupso_url_t=\"\";var hupso_title_t=\"Brands and grades of construction steel\";<\/script><script type=\"text\/javascript\" src=\"https:\/\/static.hupso.com\/share\/js\/share_toolbar.js\"><\/script><!-- Hupso Share Buttons --><\/div>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[54],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v19.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Classes of steel - 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