{"id":15783,"date":"2022-07-21T08:26:40","date_gmt":"2022-07-21T08:26:40","guid":{"rendered":"https:\/\/www.smetals.co.uk\/?post_type=product&#038;p=15783"},"modified":"2026-07-08T14:56:13","modified_gmt":"2026-07-08T14:56:13","slug":"70mm-x-70mm-x-5mm-mild-steel-square-hollow-tube","status":"publish","type":"product","link":"https:\/\/www.smetals.co.uk\/product\/70mm-x-70mm-x-5mm-mild-steel-square-hollow-tube\/","title":{"rendered":"70mm x 70mm x 5mm Mild Steel Square Hollow Tube"},"content":{"rendered":"<h2>70 x 5mm Mild Steel Square Hollow Tube<\/h2>\n<p>Speciality Metals is one of the leading suppliers of mild steel square hollow tube in the United Kingdom. Additionally, in addition to stocking only the best products, we provide the most helpful customer service by providing bespoke cutting and fast shipping.<\/p>\n<p>Box sections, also known as mild steel hollow sections or ERW tubes, are widely used in a variety of applications. The durability of this material permits it to be used for a wide range of applications, including traffic signs, pipeline construction, automobile repair and as a structural steel.<\/p>\n<p>Mild steel square hollow tubes are a popular choice for a wide range of applications. Offered in various lengths by Speciality Metals, these tubes are known for their durability, versatility, cost-effectiveness and recyclability. What makes this product even more attractive is its excellent welding, forming, bending and machining abilities. Whether you need a tubing solution for construction, engineering or manufacturing, mild steel square hollow tubes are a great choice. With their exceptional strength-to-weight ratio and easy-to-handle size of 70mm x 70mm x 5mm, these tubes can make any project stand out.\u00a0<\/p>\n<p>If you prefer something similar in a round profile then take a look at our <strong><a href=\"https:\/\/www.smetals.co.uk\/product\/70-x-2mm-mild-steel-tube-erw-round-tubing\/\">70 x 2mm mild steel tubing<\/a><\/strong>.\u00a0<\/p>\n<h2>What Is Steel Hollow Tube?<\/h2>\n<p>Mild steel square tube box section is a robust metal product, though it&#8217;s vulnerable to rust over time. Consider galvanised or stainless steel if rust resistance is crucial. The rust on this hollow tube can be removed with WD40 or light sanding. In terms of bending and forming, it&#8217;s fair; you&#8217;ll need tools, since handbending isn&#8217;t feasible. Due to its lack of protective coating, it has poor corrosion resistance. Stainless steel also performs well in machining and grinding.<\/p>\n<p>The hollow tube shines when welded, making it easy to adapt as needed. As galvanised and stainless steel don&#8217;t retain paint well, mild steel is recommended for painting. Stainless steel or galvanised steel are better for longevity; wear resistance is fair. A plain steel grade is ideal for machining, forming, and welding. Mild steel is magnetic, so magnets stick to it, but it&#8217;s not a magnet. Paint adheres well to mild steel. It&#8217;s not as strong as stainless steel, but it is harder and more rigid. You can drill through it with ease, and use a variety of fasteners. Mild steel is much less expensive than other grades; its cost-effectiveness makes it well worth considering for many projects.<\/p>\n<h5>Key information:<\/h5>\n<ul>\n<li><strong>Shape \u2013 Square Box Section<\/strong><\/li>\n<li><strong>Grade \u2013 S235JRH<\/strong><\/li>\n<li><strong>Hot or Cold Rolled \u2013 Cold Rolled<\/strong><\/li>\n<li><strong> Box Outer Size &#8211; 70 x 70<\/strong><strong>mm<\/strong><\/li>\n<li><strong>Wall Thickness \u2013 5mm<\/strong><\/li>\n<\/ul>\n<p>We also carry a wide range of mild steel\u00a0<a href=\"https:\/\/www.smetals.co.uk\/product-category\/sheet-metal\/mild-steel-plate-cut-to-size\/\" target=\"_blank\" rel=\"noopener noreferrer\"><strong>sheet metal<\/strong><\/a>,\u00a0<a href=\"https:\/\/www.smetals.co.uk\/product\/mild-steel-angle-iron-steel-section-20-60mm-width-3-6mm-thick\/\" target=\"_blank\" rel=\"noopener noreferrer\"><strong>angle iron<\/strong>\u00a0<\/a>and\u00a0<a href=\"https:\/\/www.smetals.co.uk\/product\/mild-steel-flat-bar-steel-strip\/\" target=\"_blank\" rel=\"noopener noreferrer\"><strong>flat bar<\/strong>.<\/a><\/p>\n<h4>Why Choose Speciality Metals<\/h4>\n<p>Speciality Metals is known to be the United Kingdom\u2019s best up-and-coming small-quantity metal company.<\/p>\n<ul>\n<li><strong>FREE UK delivery on all orders<\/strong><\/li>\n<li><strong>Order dispatch within 24 hours of order<\/strong><\/li>\n<li><strong>Located in Warrington, UK which is the UK home of mesh and metals<\/strong><\/li>\n<li><strong>Our experienced staff are experts in the mesh market and care personally about your customer experience<\/strong><\/li>\n<\/ul>\n<p>Furthermore we stock a vast range of <a href=\"https:\/\/www.smetals.co.uk\/product-category\/tube\/\"><strong>round tube<\/strong><\/a> options that compliment our mesh range perfectly.<\/p>\n<p>Over 50,000 customers of Specialty Metals are provided with fast, friendly customer service every year. We\u2019re the place to try when you need metal of any shape and size. We\u2019re based in Warrington, UK. We pride ourselves on our rapid turnaround and a large range of options.<\/p>\n<p>&nbsp;<\/p>\n<hr \/>\n<h4>FAQs About This Product<\/h4>\n<div class=\"group w-full text-gray-800 dark:text-gray-100 border-b border-black\/10 dark:border-gray-900\/50 bg-gray-50 dark:bg-[#444654]\">\n<div class=\"flex p-4 gap-4 text-base md:gap-6 md:max-w-2xl lg:max-w-[38rem] xl:max-w-3xl md:py-6 lg:px-0 m-auto\">\n<div class=\"relative flex w-[calc(100%-50px)] flex-col gap-1 md:gap-3 lg:w-[calc(100%-115px)]\">\n<div class=\"flex flex-grow flex-col gap-3\">\n<div class=\"min-h-[20px] flex flex-col items-start gap-4 whitespace-pre-wrap break-words\">\n<h2>Is Mild Steel Square Hollow Tube Biodegradable?<\/h2>\n<p>Mild steel square hollow tube, like other metals, is not biodegradable in the traditional sense of the term. Biodegradable materials are typically organic substances that can be broken down by natural processes, often assisted by microorganisms, into simpler, harmless substances over a relatively short time span. Mild steel, being an inorganic material, does not undergo this process.<\/p>\n<p>However, mild steel is prone to corrosion, especially when exposed to moisture and oxygen. Over extended periods, this corrosion can cause the steel to rust and eventually disintegrate. While this process might seem similar to biodegradation, it&#8217;s fundamentally different. Corrosion is a chemical transformation that returns the steel to its natural state, namely iron oxide, but it doesn&#8217;t get consumed or metabolised as organic matter does during biodegradation. Furthermore, while the rusting process can break down the structural integrity of steel products, the timeframe for this is considerably longer than what is typically associated with biodegradability.<\/p>\n<h2>Is Mild Steel Square Hollow Tube Suitable for High-Speed Applications?<\/h2>\n<p>Mild steel square hollow tubes are known for their versatility in various applications, from construction to machinery. However, when considering high-speed applications, one must understand the context. If we&#8217;re discussing high-speed machinery components, mild steel might not be the most suitable due to factors like its fatigue strength and potential for vibrations. At high speeds, materials are subjected to increased stress, dynamic loads and potential for fatigue. Mild steel, being a low-carbon steel, doesn&#8217;t possess the strength or hardness of its high-carbon or alloy steel counterparts. This can result in a reduced lifespan of the component or potential failures in high-speed environments. Moreover, the shape of a square hollow tube might not be aerodynamically efficient in scenarios where this is a concern, such as in vehicles or turbines. In conclusion, while mild steel square hollow tubes have their advantages in terms of weldability, ductility and cost, they may not be the most suitable choice for high-speed applications without proper engineering considerations.<\/p>\n<h2>How Does it Differ From Rectangular or Circular Tubing?<\/h2>\n<p><strong>Square Tubing:<\/strong><\/p>\n<ul>\n<li><strong>Appearance:<\/strong> Equal length on all sides forming a square.<\/li>\n<li><strong>Applications:<\/strong> Structural projects, gates, fences, furniture and certain architectural applications.<\/li>\n<li><strong>Advantages:<\/strong> Uniform stress distribution when loaded equally from all sides. Easier connection at right angles, which is useful in framing or grid-like structures.<\/li>\n<\/ul>\n<p><strong>Rectangular Tubing:<\/strong><\/p>\n<ul>\n<li><strong>Appearance:<\/strong> Has unequal lengths on opposite sides, forming a rectangle.<\/li>\n<li><strong>Applications:<\/strong> Structural applications, especially where the load distribution is uneven. Common in building frames, doors and specific machinery.<\/li>\n<li><strong>Advantages:<\/strong> Provides different strengths on different axes. It can bear more weight on its longer side, making it preferable when the load isn&#8217;t perfectly square.<\/li>\n<\/ul>\n<p><strong>Circular Tubing (or Round Tubing):<\/strong><\/p>\n<ul>\n<li><strong>Appearance:<\/strong> Round in shape, like a cylinder.<\/li>\n<li><strong>Applications:<\/strong> Fluid transfer (e.g., pipes for liquids), machinery parts, certain structural applications and roles where rotation or centrifugal forces are involved.<\/li>\n<li><strong>Advantages:<\/strong> Even stress distribution in all radial directions. Aerodynamically efficient, reducing drag in certain applications. Often better at resisting torsional loads compared to square or rectangular sections.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<hr \/>\n<p>&nbsp;<\/p>\n<p><em><strong>Check out our blog discussing <a href=\"https:\/\/www.smetals.co.uk\/mild-steel\/what-is-steel-box-section\/\">what is a steel box section<\/a>. It will prove a useful read to help you to make an informed decision on which material would work best for you.\u00a0<\/strong><\/em><\/p>\n<p><em><strong>We are also very proud of our ever expanding <a href=\"https:\/\/www.youtube.com\/@SpecialityMetals\">YouTube<\/a> channel.\u00a0<\/strong><\/em><\/p>\n<p><em><strong>Our goal for our blogs and help guides is to answer as many questions as possible to help to explain the possibilities of mesh to our customers.\u00a0 <a href=\"https:\/\/www.smetals.co.uk\/contact\/\" target=\"_blank\" rel=\"noreferrer noopener\">Contact us<\/a>\u00a0today if you have any questions at all. We are always really keen to help in any way that we can.<\/strong><\/em><\/p>\n<p><em><strong>We are also very proud of our highly popular\u00a0<a href=\"https:\/\/www.ebay.co.uk\/itm\/303565335602?hash=item46ade76c32:g:52wAAOSwn35hVB0a&amp;amdata=enc%3AAQAHAAAA4FIP%2Fs70tTymwnOpAeuHgnIW%2FBAqQpqeR6HroKjmP36%2F%2FmVroq%2BkLuGAaqDDsbaUfezU7AgwWXqeZQmNQ9vUrKB0HvNfHGAMnrWAV3zaYwfaFXdb1ZPy%2BLRANrk4r34iTPERZMCKc4gz2jaHnnKfbWTRLl8wCNCXv1nnvzGyQjL%2BLPk7pduZ2rCUZMa%2B9dwXbeWE8%2FtoTTxof0z3NBEHraiWUdiMaSNaodMXjF7JoSwCP86rmynJf3BJud112BCDM1VXm9EmoScImhggISQRN41JtQY58AhlfjQsHHCoaCVv%7Ctkp%3ABFBMrKS3v79g\">eBay store<\/a>, check us out there too.<\/strong><\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p><em><strong>\u00a3 MULTIBUY SAVINGS &#8211; Order 3 For 10% Off<\/strong><\/em><\/p>\n<p><em><strong>\u2714 Specialists In Rapid Shipments Of Any Size<\/strong><\/em><\/p>\n<p><em><strong>\u2714 FREE UK Delivery Included<\/strong><\/em><\/p>\n<p><em><strong>\u2714 Immediate Express Dispatch From Stock<\/strong><\/em><\/p>\n<p><em><strong>\u2714 Tracked Delivery with Order Updates<\/strong><\/em><\/p>\n<p><em><strong>\u2714 30-Day Returns Accepted<\/strong><\/em><\/p>\n<p><strong>@ \u260f \u00a0<a href=\"https:\/\/themeshcompany.com\/contact-us\/\"><em>Bespoke Cuts &amp; Longer Lengths Available<\/em><\/a>\u00a0<\/strong><\/p>\n<p>Looking for a durable and versatile hollow tube for your project? Look no further than Speciality Metals&#8217; 70mm x 70mm x 5mm Mild Steel Square Hollow Tube. Available in various lengths, this cost-effective option offers excellent welding, forming, bending and machining abilities, making it perfect for a variety of applications. Plus, it&#8217;s recyclable, so you can feel good about choosing an environmentally-friendly option. Whether you&#8217;re building a fence, constructing a frame, or creating something entirely unique, this steel tube is a reliable choice.<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone wp-image-20868 size-full\" src=\"https:\/\/www.smetals.co.uk\/wp-content\/uploads\/2022\/09\/Mild-Steel-Sheet.jpg\" alt=\"\" width=\"1280\" height=\"224\" srcset=\"https:\/\/www.smetals.co.uk\/wp-content\/uploads\/2022\/09\/Mild-Steel-Sheet.jpg 1280w, https:\/\/www.smetals.co.uk\/wp-content\/uploads\/2022\/09\/Mild-Steel-Sheet-300x53.jpg 300w, https:\/\/www.smetals.co.uk\/wp-content\/uploads\/2022\/09\/Mild-Steel-Sheet-1024x179.jpg 1024w, https:\/\/www.smetals.co.uk\/wp-content\/uploads\/2022\/09\/Mild-Steel-Sheet-768x134.jpg 768w, https:\/\/www.smetals.co.uk\/wp-content\/uploads\/2022\/09\/Mild-Steel-Sheet-600x105.jpg 600w\" sizes=\"(max-width: 1280px) 100vw, 1280px\" \/><\/p>\n","protected":false},"featured_media":18864,"comment_status":"open","ping_status":"closed","template":"","meta":{"_exactmetrics_skip_tracking":false},"product_brand":[],"product_cat":[36,20],"product_tag":[54,37,23,51],"class_list":["post-15783","product","type-product","status-publish","has-post-thumbnail","product_cat-mild-steel-square-tube","product_cat-tube","product_tag-5mm-thick","product_tag-box-section","product_tag-mild-steel","product_tag-square-tube","first","instock","taxable","shipping-taxable","purchasable","product-type-variable"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>70mm x 70mm x 5mm Mild Steel Square Hollow Tube - Speciality Metals<\/title>\n<meta name=\"description\" content=\"Top quality UK made square hollow tube mild steel box sections. Ideal for many engineering &amp; DIY jobs. Best prices &amp; rapid dispatch\" \/>\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.smetals.co.uk\/product\/70mm-x-70mm-x-5mm-mild-steel-square-hollow-tube\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"70mm x 70mm x 5mm Mild Steel Square Hollow Tube - Speciality Metals\" \/>\n<meta property=\"og:description\" content=\"Top quality UK made square hollow tube mild steel box sections. Ideal for many engineering &amp; DIY jobs. Best prices &amp; rapid dispatch\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.smetals.co.uk\/product\/70mm-x-70mm-x-5mm-mild-steel-square-hollow-tube\/\" \/>\n<meta property=\"og:site_name\" content=\"Speciality Metals\" \/>\n<meta property=\"article:modified_time\" content=\"2026-07-08T14:56:13+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.smetals.co.uk\/wp-content\/uploads\/2023\/04\/Mild-Steel-Box-Section-70-x-70mm-2mm-Thick-Image-4.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1000\" \/>\n\t<meta property=\"og:image:height\" content=\"1000\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"6 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.smetals.co.uk\\\/product\\\/70mm-x-70mm-x-5mm-mild-steel-square-hollow-tube\\\/\",\"url\":\"https:\\\/\\\/www.smetals.co.uk\\\/product\\\/70mm-x-70mm-x-5mm-mild-steel-square-hollow-tube\\\/\",\"name\":\"70mm x 70mm x 5mm Mild Steel Square Hollow Tube - Speciality Metals\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.smetals.co.uk\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.smetals.co.uk\\\/product\\\/70mm-x-70mm-x-5mm-mild-steel-square-hollow-tube\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.smetals.co.uk\\\/product\\\/70mm-x-70mm-x-5mm-mild-steel-square-hollow-tube\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.smetals.co.uk\\\/wp-content\\\/uploads\\\/2023\\\/04\\\/Mild-Steel-Box-Section-70-x-70mm-2mm-Thick-Image-4.jpg\",\"datePublished\":\"2022-07-21T08:26:40+00:00\",\"dateModified\":\"2026-07-08T14:56:13+00:00\",\"description\":\"Top quality UK made square hollow tube mild steel box sections. 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