{"id":3407,"date":"2026-09-23T13:19:45","date_gmt":"2026-09-23T05:19:45","guid":{"rendered":"http:\/\/www.1amalerei.com\/blog\/?p=3407"},"modified":"2026-09-23T13:19:45","modified_gmt":"2026-09-23T05:19:45","slug":"why-are-some-tin-cans-magnetic-while-others-are-not-426c-145935","status":"publish","type":"post","link":"http:\/\/www.1amalerei.com\/blog\/2026\/09\/23\/why-are-some-tin-cans-magnetic-while-others-are-not-426c-145935\/","title":{"rendered":"Why are some tin cans magnetic while others are not?"},"content":{"rendered":"

Hey everyone, it\u2019s Jake here from your go-to tin cans supplier. Last week, I got a random DM from a customer\u2014said they ordered two batches of our standard food tin cans, and half the cans stuck to their warehouse forklift magnets, the other half didn\u2019t. They were low-key panicking, thought we messed up materials or something. That made me think: this is a question so many people have, but no one really breaks it down simply, right? So today we\u2019re talking about why some tin cans are magnetic and others aren\u2019t. Let\u2019s cut the jargon and keep this real. Tin Cans<\/a><\/p>\n

<\/p>\n

First off, let\u2019s get one thing straight: not all tin cans are actually made of \u201ctin.\u201d I know, that\u2019s confusing. Back in the day, like a hundred years ago, most food tins were thin sheets of actual tin metal. Tin is non-ferromagnetic, so those old cans wouldn\u2019t stick to a magnet at all. But modern food cans? They\u2019re almost always made of steel, with a super thin coating of tin. That coating is just there to stop the steel from rusting and keep food safe, it\u2019s not structural. So when someone asks if a tin can is magnetic, they\u2019re basically testing the steel underneath that thin tin layer. Wait, but why are some steel tins magnetic and others not? Good question\u2014let\u2019s dive into steel types.<\/p>\n

Steel is an alloy of iron and carbon, right? But there are so many other elements mixed in depending on what it\u2019s used for. The key here is ferromagnetism\u2014why some metals stick to magnets. Ferromagnetism only happens when a metal has \u201cunpaired electrons\u201d that align in little regions called domains. When those domains line up in the same direction, the whole metal becomes magnetic. Iron is naturally ferromagnetic, but add other elements to make steel, and that changes things.<\/p>\n

Most tin cans we supply are made of low-carbon steel, also called mild steel. That\u2019s the stuff that\u2019s cheap, easy to form into those round can shapes, weld together, and perfect for food packaging. Low-carbon steel is super magnetic. But why would a can not be magnetic then? Oh right\u2014some manufacturers use a different type of steel for cans, usually stainless steel. Wait, not all stainless steel is non-magnetic, but the kind used for cans usually is. Let\u2019s clarify that.<\/p>\n

Stainless steel is made of iron, carbon, and at least 10.5% chromium, plus other elements like nickel sometimes. The mix of chromium and nickel changes the crystal structure of the steel, which messes with those magnetic domains. There are different grades of stainless steel: ferritic and martensitic stainless steel are magnetic, but austenitic stainless steel\u2014this is the one most commonly used for food cans, specialty containers, and even kitchen appliances\u2014isn\u2019t. That\u2019s why you\u2019ll see those fancy stainless steel water bottles that don\u2019t stick to your fridge magnet.<\/p>\n

But here\u2019s the plot twist that confuses people even more: sometimes stainless steel cans will stick to a magnet anyway. That\u2019s not a defect, that\u2019s just how metal works. When you bend, stamp, or form stainless steel into a can shape (which is all we do at our factory, basically stamping those steel sheets into cylinders and crimping the ends), you cause something called \u201cwork hardening.\u201d That deformation rearranges the crystal structure just enough to make austenitic stainless steel temporarily magnetic. It\u2019s not a bad can, it\u2019s just a side effect of shaping it. If you heat that can up to really high temperatures (like 1700\u00b0F or so), it\u2019ll lose that temporary magnetism again. Most home or warehouse situations never get that hot, so that temporary magnetism stays. So when a customer says half their stainless steel cans are magnetic, that\u2019s almost always why.<\/p>\n

Wait, let\u2019s tie this back to my own tin cans, since that\u2019s what we sell. We offer two main types of tin cans: regular food-grade mild steel tins, and specialty austenitic stainless steel tins. The mild steel ones are always magnetic\u2014every single time. They\u2019re cheaper, great for things like soup, beans, pet food, the stuff most people stock up on. The stainless steel ones are non-magnetic when they come off the line, but if you bend them, stamp them, or stack them a certain way (which happens in shipping, warehouse storage, even on the store shelf), some of them might pick up a little temporary magnetism. It\u2019s not a flaw, it\u2019s just the nature of forming metal into a can. I always tell customers who get that to not panic\u2014it\u2019s still 100% food-safe, works exactly like it\u2019s supposed to, the magnetism doesn\u2019t affect the can\u2019s performance at all.<\/p>\n

Another thing people ask: does the tin coating have anything to do with it? Nope, like I said earlier, the tin is only 0.00015 inches thick\u2014super thin, that\u2019s about a hundred times thinner than a human hair. Tin itself is non-magnetic, so if the underlying steel is magnetic, the thin tin layer doesn\u2019t change that. If the steel is non-magnetic, the tin layer also won\u2019t make it magnetic. I\u2019ve tested this a hundred times\u2014take a mild steel can, sand off the tiny tin coating with some sandpaper, it still sticks. Take a stainless steel can, sand off the tin, it still doesn\u2019t (unless it\u2019s got that work hardening from being shaped). So the tin is just a protective layer, not a factor in magnetism.<\/p>\n

Let\u2019s also bust a common myth I hear all the time: if a tin can is magnetic, it\u2019s not food-safe. That\u2019s totally wrong. The magnetism has nothing to do with whether the can meets food-grade standards. Our mild steel cans go through the exact same testing as our stainless steel ones\u2014we test for lead, BPA, corrosion, all that stuff required by the FDA (and other regulatory bodies around the world). The magnet is just a cheap way to test what kind of steel you\u2019re dealing with, not a test for food safety. I had a customer last year who refused to buy our mild steel cans because a magnet stuck, thinking they were toxic. We sent them samples of both types, did a quick test for them, and they ended up reordering twice as much because the mild steel cans are cheaper and perfect for their product.<\/p>\n

So let\u2019s recap, super simple, no fancy science terms:<\/p>\n

    \n
  1. Regular tin cans (the kind for soup, beans, pet food) are magnetic because they\u2019re made of mild steel, a cheap, easy-to-form metal that\u2019s naturally magnetic.<\/li>\n
  2. Some specialty tin cans (stainless steel ones) are non-magnetic, usually because they\u2019re made of a specific type of stainless steel called austenitic.<\/li>\n
  3. Sometimes stainless steel cans will stick to a magnet temporarily, just because we shape them into cans\u2014 that\u2019s work hardening, not a defect.<\/li>\n
  4. The thin tin coating on all cans doesn\u2019t affect magnetism at all.<\/li>\n
  5. Magnetism doesn\u2019t mean a can is broken or not food-safe.<\/li>\n<\/ol>\n

    Now, why does this matter for you? If you\u2019re a restaurant owner buying bulk cans to prep food, a small business owner making craft goods (like candles or homemade jam) that use tin cans, a warehouse manager storing canned goods, or even a crafter using cans for DIY projects, knowing this helps you pick the right can for your needs. If you need cans that won\u2019t stick to magnets (like for a display rack that uses magnets, or for a project where magnetic cans would get in the way), go for our austenitic stainless steel cans. If you don\u2019t care about magnetism, want a cheaper option that\u2019s perfect for bulk food storage, our mild steel cans are the way to go. And if you do get a batch of stainless steel cans that have a little temporary magnetism, just wipe them down or stack them gently\u2014they\u2019ll lose most of it over time, or it\u2019s never going to affect what you use them for.<\/p>\n

    I get that when something doesn\u2019t work the way you expect, it\u2019s frustrating. Our team here knows that, which is why we always include a little info sheet with every order explaining this whole magnetism thing, just in case someone notices and panics. We\u2019ve had customers tell us that sheet saved them from returning a whole pallet of cans, which is why we make a point to be transparent about this stuff.<\/p>\n

    If you\u2019re shopping for tin cans, whether you\u2019re ordering 100 for a small business or 100,000 for a large operation, we\u2019ve got you covered. We make all sizes: 4oz sample cans, 12oz standard food cans, 1-gallon large cans, whatever you need. We test every batch to make sure they meet all safety standards, and our team is always here to answer questions\u2014whether it\u2019s about magnetism, coating types, printing options, whatever.<\/p>\n

    If you\u2019re tired of dealing with unreliable tin can suppliers, hit us up to talk about your needs. We\u2019ll send you free samples, help you figure out exactly which can is right for your product, and give you a fair price that doesn\u2019t cut corners on quality. Don\u2019t waste time with suppliers who don\u2019t explain the basics, and definitely don\u2019t stress if you notice your cans sticking to a magnet\u2014now you know it\u2019s totally normal, and not a red flag.<\/p>\n

    <\/p>\n

    Thanks for sticking around to read this, guys. Next time you grab a can from the pantry and test it with a magnet, you\u2019ll know exactly why it sticks (or doesn\u2019t). If you have more questions, drop a comment below or reach out\u2014happy to help. Now go stock up on whatever you need, and remember: magnetic or not, our tin cans get the job done right.<\/p>\n

    Combination Machine<\/a> References<\/p>\n

      \n
    1. Metals, Minerals & Materials Society. Ferromagnetism in Alloyed Steels.<\/li>\n
    2. International Stainless Steel Forum. Austenitic Stainless Steel Properties.<\/li>\n
    3. U.S. Food and Drug Administration. Food Contact Substances: Metal Packaging.<\/li>\n<\/ol>\n
      \n

      Xiamen Uniteam Sourcing Co., Ltd.<\/a>
      As one of the most professional tin cans manufacturers and suppliers in China, we also support customized service. Please feel free to buy high quality tin cans made in China here from our factory. For more information, contact us now.
      Address: ROOM 1511, NO. 939, XIAHE ROAD, SIMING DISTRICT, XIAMEN, FUJIAN, CHINA.
      E-mail: operator@minjiapack.com
      WebSite:       https:\/\/www.minjiapacking.com\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

      Hey everyone, it\u2019s Jake here from your go-to tin cans supplier. Last week, I got a … Why are some tin cans magnetic while others are not?<\/span>Read more<\/a><\/p>\n","protected":false},"author":110,"featured_media":3407,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[3370],"class_list":["post-3407","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry","tag-tin-cans-4dec-14918f"],"_links":{"self":[{"href":"http:\/\/www.1amalerei.com\/blog\/wp-json\/wp\/v2\/posts\/3407","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.1amalerei.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.1amalerei.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.1amalerei.com\/blog\/wp-json\/wp\/v2\/users\/110"}],"replies":[{"embeddable":true,"href":"http:\/\/www.1amalerei.com\/blog\/wp-json\/wp\/v2\/comments?post=3407"}],"version-history":[{"count":0,"href":"http:\/\/www.1amalerei.com\/blog\/wp-json\/wp\/v2\/posts\/3407\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.1amalerei.com\/blog\/wp-json\/wp\/v2\/posts\/3407"}],"wp:attachment":[{"href":"http:\/\/www.1amalerei.com\/blog\/wp-json\/wp\/v2\/media?parent=3407"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.1amalerei.com\/blog\/wp-json\/wp\/v2\/categories?post=3407"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.1amalerei.com\/blog\/wp-json\/wp\/v2\/tags?post=3407"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}