{"id":17413,"date":"2026-05-08T16:18:58","date_gmt":"2026-05-08T15:18:58","guid":{"rendered":"https:\/\/www.fhbrundle.co.uk\/lp\/?post_type=avada_faq&#038;p=17413"},"modified":"2026-05-08T16:19:34","modified_gmt":"2026-05-08T15:19:34","slug":"what-is-the-difference-between-mild-steel-and-red-oxide-painted-universal-beams-or-columns","status":"publish","type":"avada_faq","link":"https:\/\/www.fhbrundle.co.uk\/lp\/blog\/faq-items\/what-is-the-difference-between-mild-steel-and-red-oxide-painted-universal-beams-or-columns\/","title":{"rendered":"What is the difference between mild steel and red oxide painted universal beams or columns?"},"content":{"rendered":"<p data-start=\"1115\" data-end=\"1168\">Red oxide is mainly an <strong data-start=\"1138\" data-end=\"1163\">anti-corrosion primer<\/strong>. It:<\/p>\n<ul data-start=\"1169\" data-end=\"1278\">\n<li data-section-id=\"1m6a76j\" data-start=\"1169\" data-end=\"1192\">slows rust formation,<\/li>\n<li data-section-id=\"153po1t\" data-start=\"1193\" data-end=\"1235\">protects steel during transport\/storage,<\/li>\n<li data-section-id=\"1il5na4\" data-start=\"1236\" data-end=\"1278\">provides a base coat for later painting.<\/li>\n<\/ul>\n<p data-start=\"1280\" data-end=\"1380\">It is <strong data-start=\"1286\" data-end=\"1293\">not<\/strong> usually considered a final decorative or long-term protective finish unless specified.<\/p>\n<h3 data-section-id=\"78uvwr\" data-start=\"1382\" data-end=\"1406\">Strength difference?<\/h3>\n<p data-start=\"1407\" data-end=\"1457\">Normally <strong data-start=\"1416\" data-end=\"1424\">none<\/strong>.<br data-start=\"1425\" data-end=\"1428\" \/>The beam strength depends on:<\/p>\n<ul data-start=\"1458\" data-end=\"1534\">\n<li data-section-id=\"1tbklx2\" data-start=\"1458\" data-end=\"1499\">steel grade (for example S275 or S355),<\/li>\n<li data-section-id=\"41g2ve\" data-start=\"1500\" data-end=\"1512\">beam size,<\/li>\n<li data-section-id=\"15n3pjg\" data-start=\"1513\" data-end=\"1534\">section properties,<\/li>\n<\/ul>\n<p data-start=\"1536\" data-end=\"1573\">\u2014not whether it has red oxide primer.<\/p>\n<h3 data-section-id=\"u675jv\" data-start=\"1575\" data-end=\"1598\">When to choose each<\/h3>\n<ul data-start=\"1599\" data-end=\"1893\">\n<li data-section-id=\"13zgq70\" data-start=\"1599\" data-end=\"1731\">Choose <strong data-start=\"1608\" data-end=\"1630\">bare mild steel UB<\/strong> if:\n<ul data-start=\"1637\" data-end=\"1731\">\n<li data-section-id=\"885ae9\" data-start=\"1637\" data-end=\"1661\">you will galvanize it,<\/li>\n<li data-section-id=\"16fy4n6\" data-start=\"1664\" data-end=\"1693\">fabricate\/weld extensively,<\/li>\n<li data-section-id=\"1m6oq1g\" data-start=\"1696\" data-end=\"1731\">or apply your own coating system.<\/li>\n<\/ul>\n<\/li>\n<li data-section-id=\"1nmpvun\" data-start=\"1733\" data-end=\"1893\">Choose <strong data-start=\"1742\" data-end=\"1766\">red oxide painted UB<\/strong> if:\n<ul data-start=\"1773\" data-end=\"1893\">\n<li data-section-id=\"dr4vkd\" data-start=\"1773\" data-end=\"1806\">you want quick rust protection,<\/li>\n<li data-section-id=\"belbs\" data-start=\"1809\" data-end=\"1849\">the beam may sit outdoors temporarily,<\/li>\n<li data-section-id=\"jc8km5\" data-start=\"1852\" data-end=\"1893\">or you want it pre-primed for painting.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p data-start=\"1895\" data-end=\"2021\" data-is-last-node=\"\" data-is-only-node=\"\">Common steel grades for UBs in the UK include <span class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"><span class=\"whitespace-normal\">S275 structural steel<\/span><\/span> and <span class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"><span class=\"whitespace-normal\">S355 structural steel<\/span><\/span>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Red oxide is mainly an anti-corrosion primer. It: slows rust [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","format":"standard","meta":{"footnotes":""},"faq_category":[192],"class_list":["post-17413","avada_faq","type-avada_faq","status-publish","format-standard","hentry","faq_category-structural-steel-sections"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.5 (Yoast SEO v27.5) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>What is the difference between mild steel and red oxide painted universal beams or columns? - F.H.Brundle<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.fhbrundle.co.uk\/lp\/blog\/faq-items\/what-is-the-difference-between-mild-steel-and-red-oxide-painted-universal-beams-or-columns\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What is the difference between mild steel and red oxide painted universal beams or columns?\" \/>\n<meta property=\"og:description\" content=\"Red oxide is mainly an anti-corrosion primer. 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