{"id":15682,"date":"2022-07-20T15:32:05","date_gmt":"2022-07-20T15:32:05","guid":{"rendered":"https:\/\/www.smetals.co.uk\/?post_type=product&#038;p=15682"},"modified":"2026-07-07T12:52:23","modified_gmt":"2026-07-07T12:52:23","slug":"75mm-x-75mm-x-3mm-mild-steel-square-section-box-tube","status":"publish","type":"product","link":"https:\/\/www.smetals.co.uk\/product\/75mm-x-75mm-x-3mm-mild-steel-square-section-box-tube\/","title":{"rendered":"75mm x 75mm x 3mm Mild Steel Square Section Box Tube"},"content":{"rendered":"<h2>75 x 3mm Square Steel Section Box<\/h2>\n<p>Speciality Metals is one of the leading suppliers of mild steel square section box 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>If you&#8217;re in the market for a durable and versatile steel tube, look no further than Speciality Metals&#8217; 75mm x 75mm x 3mm Mild Steel Square Section Box Tube. With a range of lengths available, this cost-effective option is perfect for a variety of projects and applications. Not only is it recyclable, but it also boasts excellent welding, forming, bending and machining abilities, making it a smart choice for any DIY enthusiast or professional. So whether you&#8217;re building a structure, creating an art installation, or simply need a reliable material for your latest project, this section box tube won&#8217;t disappoint.<\/p>\n<h2>Mild Steel<\/h2>\n<p>Mild steel square tube box section is a quality strong metal product. However it is not rust proof and may do so over time. Please use galvanised or stainless steel if you need resistance to rust. If this metal tube does show signs off rust then simply get this off with WD40 or fine sanding.<\/p>\n<ul>\n<li><strong>Bending &amp; Forming \u2013 Fair. You could only bend this tubing with bending tools but not by hand<\/strong><\/li>\n<li><strong>Corrosion Resistance \u2013 Poor. Mild steel is uncoated, so there is no additional protection against corrosion<\/strong><\/li>\n<li><strong>Machining &amp; Grinding \u2013 Good. Mild steel is the metal choice for many forms of machining and grinding, but stainless steel can also offer good results<\/strong><\/li>\n<li><strong>Welding \u2013 Excellent. You could easily weld with this tubing to suit your requirements<\/strong><\/li>\n<li><strong>Painting \u2013 Good. We suggest that a mild steel product is always used when a layer of paint needs to be applied. Galvanised and stainless steel will not take paint<\/strong><\/li>\n<li><strong>Wear Resistance \u2013 Fair. As there is no protective layer, we suggest stainless steel or galvanised steel if you require a stronger wear resistance<\/strong><\/li>\n<\/ul>\n<p>The grade of plain steel that we have available has mechanical properties that provide excellent machinability, formability and weldability. Mild steel can be welded and it is also suitable for painting. Mild steel is a magnetic grade of metal. Magnets will stick to this sheet but it is not itself a magnet.<\/p>\n<p>Key information:<\/p>\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; 75 x 75<\/strong><strong>mm<\/strong><\/li>\n<li><strong>Wall Thickness \u2013 3mm<\/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\">sheet metal<\/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\">angle iron\u00a0<\/a>and\u00a0<a href=\"https:\/\/www.smetals.co.uk\/product\/mild-steel-flat-bar-steel-strip\/\" target=\"_blank\" rel=\"noopener noreferrer\">flat bar.<\/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<h2>Are There Any Common Issues or Concerns with Mild Steel Section Box?<\/h2>\n<ol>\n<li>\n<p><strong>Corrosion<\/strong>: The most common concern with mild steel is its susceptibility to rust when exposed to moisture and oxygen. Without proper protection, such as paint, galvanisation or other coatings, it can corrode quickly, especially in humid or marine environments.<\/p>\n<\/li>\n<li>\n<p><strong>Strength Limitations<\/strong>: Mild steel, compared to high-strength steels, has a lower yield strength. This means that for specific heavy-duty applications, it may not be the most suitable choice unless designed with thicker walls or supported with other reinforcing methods.<\/p>\n<\/li>\n<li>\n<p><strong>Weldability<\/strong>: While mild steel is generally easy to weld, the process can introduce residual stresses or affect the properties near the welded zone. Proper welding techniques and post-weld treatments are essential to maintain the integrity of the section.<\/p>\n<\/li>\n<li>\n<p><strong>Dimensional Tolerances<\/strong>: As with all manufacturing processes, there can be variations in the final product&#8217;s dimensions. It&#8217;s crucial to check the dimensional tolerances if precision is required for a particular application.<\/p>\n<\/li>\n<li>\n<p><strong>Weight<\/strong>: Due to its solid nature, mild steel is heavier than other materials like aluminum. This can be a concern for projects where weight is a critical factor.<\/p>\n<\/li>\n<li>\n<p><strong>Aesthetic Concerns<\/strong>: Over time, especially if not properly protected, mild steel can undergo aesthetic changes, like developing a patina or rust. This might not be desirable for all applications.<\/p>\n<\/li>\n<li>\n<p><strong>Thermal Conductivity<\/strong>: Mild steel has a high thermal conductivity compared to insulating materials, which means it might not be the best choice for applications requiring thermal insulation.<\/p>\n<\/li>\n<li>\n<p><strong>Chemical Reactivity<\/strong>: Mild steel can react with certain chemicals, leading to corrosion or degradation. It&#8217;s essential to consider the environment in which the steel will be placed and any chemicals it may be exposed to.<\/p>\n<\/li>\n<\/ol>\n<h2>What Maintenance is Required for Mild Steel Section Box Structures?<\/h2>\n<ol>\n<li>\n<p><strong>Regular Inspections<\/strong>: It&#8217;s essential to regularly inspect mild steel structures for signs of rust, corrosion, wear or any physical damage. Check welds, connections and any areas that might retain water or are in contact with corrosive substances.<\/p>\n<\/li>\n<li>\n<p><strong>Cleaning<\/strong>: Remove accumulated dirt, debris and contaminants. Depending on the environment, this might need to be done more or less frequently. In marine or industrial atmospheres, where salt or chemicals are prevalent, cleaning should be more regular.<\/p>\n<\/li>\n<li>\n<p><strong>Rust Removal<\/strong>: If rust spots appear, they should be promptly addressed. This can be done using wire brushes, sandpaper or chemical rust removers. Once the rust is removed, the exposed area should be repainted or treated to prevent future rusting.<\/p>\n<\/li>\n<li>\n<p><strong>Repainting\/Recoating<\/strong>: If the paint or coating shows signs of wear or damage, consider repainting or recoating the affected area. Proper surface preparation, including cleaning and priming, is crucial to ensure the new paint or coating adheres well.<\/p>\n<\/li>\n<li>\n<p><strong>Galvanic Corrosion<\/strong>: If the mild steel is in contact with a more noble metal (like copper or stainless steel) and both are exposed to an electrolyte (like water), galvanic corrosion can occur. Use insulating materials or coatings to prevent direct contact between dissimilar metals.<\/p>\n<\/li>\n<li>\n<p><strong>Drainage<\/strong>: Ensure that the design of the structure allows water to drain off easily. Prolonged water retention can accelerate corrosion, especially in the inner sections of the box.<\/p>\n<\/li>\n<li>\n<p><strong>Lubrication<\/strong>: If the structure has moving parts, like in some gate or machinery applications, regular lubrication might be necessary to prevent wear and ensure smooth operation.<\/p>\n<\/li>\n<li>\n<p><strong>Environmental Considerations<\/strong>: Be aware of any changes in the structure&#8217;s environment. For example, if a previously dry area becomes regularly wet or if a new source of chemical exposure is introduced, the structure might require additional protective measures.<\/p>\n<\/li>\n<li>\n<p><strong>Replacement of Damaged Sections<\/strong>: In cases where damage or corrosion is extensive, it might be more efficient to replace the affected section rather than repair it.<\/p>\n<\/li>\n<\/ol>\n<h2>Are There Any Alternatives to Steel for Mild Steel Section Box?<\/h2>\n<ol>\n<li>\n<p><strong>Aluminum Box Sections<\/strong>: Aluminum is lighter than steel and naturally resistant to corrosion without the need for additional treatments. It is especially useful where weight is a concern, such as in transportation or certain architectural applications. However, aluminum generally has a lower tensile strength compared to steel.<\/p>\n<\/li>\n<li>\n<p><strong>Stainless Steel Box Sections<\/strong>: Unlike mild steel, stainless steel has inherent corrosion resistance due to the presence of chromium. It is ideal for applications in aggressive environments or where a polished appearance is desired. However, stainless steel is typically more expensive than mild steel.<\/p>\n<\/li>\n<li>\n<p><strong>Galvanised Steel Box Sections<\/strong>: While still steel, these sections have been coated with zinc to provide increased corrosion resistance. They combine the strength of steel with better protection against the elements.<\/p>\n<\/li>\n<li>\n<p><strong>Fiberglass or Composite Sections<\/strong>: These are lightweight and resistant to corrosion. While they don&#8217;t have the same strength as metals, they can be suitable for certain applications, especially where insulation or resistance to electrical conductivity is essential.<\/p>\n<\/li>\n<li>\n<p><strong>Copper or Brass Box Sections<\/strong>: Less common and more expensive, these materials are chosen for specific applications because of their aesthetic or conductive properties.<\/p>\n<\/li>\n<li>\n<p><strong>PVC or Plastic Box Sections<\/strong>: These are used in applications where strength isn&#8217;t a primary concern but where resistance to corrosion, chemicals or electrical conductivity is essential. They&#8217;re commonly used in non-structural parts of buildings or for conduits.<\/p>\n<\/li>\n<li>\n<p><strong>Structural Timber<\/strong>: For some applications, especially in residential construction, timber beams can be used as an alternative to steel sections. They provide a different aesthetic and are renewable but have limitations concerning durability, strength and susceptibility to pests.<\/p>\n<\/li>\n<\/ol>\n<div class=\"min-h-[20px] flex flex-col items-start gap-4 whitespace-pre-wrap break-words\">\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>If you&#8217;re in the market for a durable and versatile steel tube, look no further than Speciality Metals&#8217; 75mm x 75mm x 3mm Mild Steel Square Section Box Tube. With a range of lengths available, this cost-effective option is perfect for a variety of projects and applications. Not only is it recyclable, but it also boasts excellent welding, forming, bending and machining abilities, making it a smart choice for any DIY enthusiast or professional. So whether you&#8217;re building a structure, creating an art installation, or simply need a reliable material for your latest project, this section box tube won&#8217;t disappoint.<\/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":18861,"comment_status":"open","ping_status":"closed","template":"","meta":{"_exactmetrics_skip_tracking":false},"product_brand":[],"product_cat":[36,20],"product_tag":[52,37,23,51],"class_list":["post-15682","product","type-product","status-publish","has-post-thumbnail","product_cat-mild-steel-square-tube","product_cat-tube","product_tag-3mm-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>75mm x 75mm x 3mm Mild Steel Square Section Box Tube - Speciality Metals<\/title>\n<meta name=\"description\" content=\"Top quality UK made mild steel hollow square section box tubing. 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\/75mm-x-75mm-x-3mm-mild-steel-square-section-box-tube\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"75mm x 75mm x 3mm Mild Steel Square Section Box Tube - Speciality Metals\" \/>\n<meta property=\"og:description\" content=\"Top quality UK made mild steel hollow square section box tubing. Ideal for many engineering &amp; DIY jobs. Best prices &amp; rapid dispatch\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.smetals.co.uk\/product\/75mm-x-75mm-x-3mm-mild-steel-square-section-box-tube\/\" \/>\n<meta property=\"og:site_name\" content=\"Speciality Metals\" \/>\n<meta property=\"article:modified_time\" content=\"2026-07-07T12:52:23+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-1.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=\"8 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\\\/75mm-x-75mm-x-3mm-mild-steel-square-section-box-tube\\\/\",\"url\":\"https:\\\/\\\/www.smetals.co.uk\\\/product\\\/75mm-x-75mm-x-3mm-mild-steel-square-section-box-tube\\\/\",\"name\":\"75mm x 75mm x 3mm Mild Steel Square Section Box Tube - Speciality Metals\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.smetals.co.uk\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.smetals.co.uk\\\/product\\\/75mm-x-75mm-x-3mm-mild-steel-square-section-box-tube\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.smetals.co.uk\\\/product\\\/75mm-x-75mm-x-3mm-mild-steel-square-section-box-tube\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.smetals.co.uk\\\/wp-content\\\/uploads\\\/2023\\\/04\\\/Mild-Steel-Box-Section-70-x-70mm-2mm-Thick-Image-1.jpg\",\"datePublished\":\"2022-07-20T15:32:05+00:00\",\"dateModified\":\"2026-07-07T12:52:23+00:00\",\"description\":\"Top quality UK made mild steel hollow square section box tubing. 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