{"id":3663,"date":"2026-10-29T12:56:03","date_gmt":"2026-10-29T04:56:03","guid":{"rendered":"http:\/\/www.tuti-industrial.com\/blog\/?p=3663"},"modified":"2026-10-29T12:56:03","modified_gmt":"2026-10-29T04:56:03","slug":"what-materials-can-a-crucible-furnace-melt-41c6-3c7165","status":"publish","type":"post","link":"http:\/\/www.tuti-industrial.com\/blog\/2026\/10\/29\/what-materials-can-a-crucible-furnace-melt-41c6-3c7165\/","title":{"rendered":"What materials can a Crucible Furnace melt?"},"content":{"rendered":"

Hey everyone, thanks for swinging by my blog\u2014if you\u2019ve ever worked with a crucible furnace, you know how game-changing these bad boys are for small to mid-sized metal projects, right? I\u2019m a supplier who\u2019s been deep in crucible furnaces for almost a decade, and one question I get all the time<\/em> from folks just starting out is: \u201cWait, what even can I melt in this thing?\u201d It\u2019s a solid question, and I\u2019ve seen so many people mess up trying to melt stuff that\u2019s way too hot, or way too reactive, for their setup. Today I\u2019m breaking this down straight, no fancy jargon, just real stuff I\u2019ve picked out from lab techs, hobbyists, and our regular customers. Crucible Furnace<\/a><\/p>\n

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First off, let\u2019s remember: a crucible furnace\u2019s whole deal is holding heat super concentrated, so what you melt depends mostly on two things: your furnace\u2019s max temp, and your crucible material. The crucible is that bottle-shaped thing you put the metal in, right? If you use a cheap ceramic crucible with a max temp of 1800\u00b0F, you can\u2019t melt steel no matter how hard you crank the furnace. That\u2019s the #1 mistake new guys make.<\/p>\n

Let\u2019s start with the basics\u2014stuff most people mess around with for small projects. Aluminum is the big one here. Its melting point is like 1220\u00b0F, which is perfect for most entry-level crucible furnaces. I see hobbyists melt aluminum cans all the time for DIY ingots, or small shop guys melting it for custom parts. Here\u2019s a pro tip: don\u2019t use food-grade cans if you\u2019re melting for anything that touches food, duh, but for metal art or gear parts? Total game. Just toss the labels, cut \u2019em up, and drop \u2019em in. Aluminum\u2019s low temp means you don\u2019t need a crazy expensive furnace either\u2014our 15kw portable crucible units do this no sweat, and they\u2019re way cheaper than industrial setups.<\/p>\n

Next up, brass and bronze. Those are alloy metals, right? Brass melts around 1650\u00b0F, bronze is a little higher, like 1700\u00b0F. Both are super popular for small projects\u2014bronze for sculptures, brass for pipe fittings, even custom jewelry parts. I\u2019ve had a few customers who make little bronze keychains melt 10lbs at a time in our mid-tier furnaces, and they\u2019re stoked. The catch here: brass has zinc in it, so when you heat it, that zinc turns to fumes. Make sure you\u2019ve got a good exhaust fan, even a cheap shop vac pointed at the furnace vent works. I\u2019ve seen guys skip that and end up with headaches for days\u2014don\u2019t do that.<\/p>\n

Copper is another one. Its melting point is ~1980\u00b0F, so that\u2019s the sweet spot for mid-tier furnaces. A lot of electricians, metal artists, and even bike builders use copper to make custom fittings or art pieces. Copper\u2019s a little trickier than aluminum because it\u2019s more reactive when hot\u2014if you leave it in the crucible too long, it can oxidize, turning that nice bright red to a dull black crud. Pro move: once it\u2019s melted, add a tiny bit of flux (like borax, not the laundry stuff, the metal-melting kind) to keep the oxidation down. We sell small flux packs with our furnaces now, \u2019cause so many people ask for \u2019em.<\/p>\n

Now let\u2019s move to the heavier stuff\u2014steel. Wait, not all steel, but most common grades like mild steel (1450\u00b0F? No, wait, hold on\u2014mild steel\u2019s actual melting point is around 2750\u00b0F, whoops, my bad earlier, I mixed up casting temps and melting points. That\u2019s a big mistake for new folks. So mild steel melts at ~2750\u00b0F, stainless is even higher, like 2750-2800\u00b0F. That means you need a crucible furnace that can hit at LEAST 3000\u00b0F, and a crucible that can handle that heat. We use graphite crucibles for steel\u2014they\u2019re way more heat-resistant than ceramic. A lot of our industrial and mid-range customers melt mild steel for custom tool parts, or small-scale metal fabrication. The downside? Steel fumes are super toxic, so you need proper ventilation and maybe a mask rated for metal fumes. No cutting corners here, safety first.<\/p>\n

Then there\u2019s cast iron. That melts at around 2200\u00b0F, so that\u2019s a step down from steel but still way hotter than aluminum. Cast iron\u2019s used for things like engine parts, custom grates, even small cookware. I had a customer last year who makes custom fireplace grates, and he uses our 25kw high-temp furnace to melt cast iron. He said it\u2019s way more cost-effective than buying pre-cast parts, and he can tweak the mix a little to make the grates more durable. The catch with cast iron? It\u2019s got carbon in it, so it can react with some crucible materials. That\u2019s why graphite crucibles are non-negotiable here\u2014ceramic ones will get eaten through by the carbon after a few melts.<\/p>\n

Wait, what about the \u201ccan I melt this weird stuff\u201d questions? I get that all the time. Let\u2019s answer the common ones: Gold, silver, and platinum\u2014yeah, all melt in crucible furnaces. Gold\u2019s ~1945\u00b0F, silver\u2019s ~1760\u00b0F, platinum is way higher, like 3215\u00b0F, so you need a super high-temp setup for that. Most jewelry makers melt gold and silver for casting rings, necklaces, etc., and our small jewelry-specific crucible furnaces work perfect for that. They\u2019re compact, easy to control, and you can melt small batches without wasting a ton of power.<\/p>\n

What about stuff that\u2019s NOT metal? Like glass? Wait, some crucible furnaces can melt glass, but it\u2019s not recommended for regular metal setups. Glass melts at way lower temps, but it can get into the crucible and mess it up for metal later. I\u2019ve had a couple guys try it, and they ended up with a crucible that was ruined\u2014so stick to metal if you\u2019re using a crucible furnace that\u2019s meant for metals.<\/p>\n

What about stuff you shouldn\u2019t<\/em> melt? That\u2019s important too. Lead? Yeah, but lead\u2019s super toxic, so I don\u2019t recommend it for anyone unless you\u2019re a pro with full PPE. Then there\u2019s things like metal alloys with high amounts of reactive metals, like magnesium. Magnesium melts at ~1200\u00b0F, but it\u2019s so flammable when melted that it can ignite if you get a tiny spark. Not a good one for hobbyists, save that for industrial setups. Also, don\u2019t melt anything with non-metal stuff mixed in\u2014like plastic on aluminum cans, or paint on scrap metal. Those fumes are toxic and can explode if they build up in the furnace.<\/p>\n

Now, let\u2019s talk about how your crucible affects what you can melt, \u2019cause that\u2019s a piece a lot of people don\u2019t know. I mentioned graphite vs ceramic earlier: Ceramic crucibles are cheap, good for low-melt metals like aluminum, brass, silver. But they crack at high temps, and can\u2019t handle steel or cast iron. Graphite crucibles are more expensive, but they can hit 3000\u00b0F+, perfect for steel, cast iron, even platinum. Then there\u2019s clay-graphite crucibles, which are a middle ground\u2014good for copper, brass, mild steel, cheaper than pure graphite. We stock all three types, and I always tell customers to match the crucible to what they\u2019re melting, not the other way around. If you\u2019re just starting with aluminum, a $15 ceramic crucible works, but if you\u2019re moving to steel, you need a $50+ graphite one.<\/p>\n

Also, furnace size matters. I\u2019ve seen a guy try to melt 50lbs of steel in a 5kw tiny furnace, and it never got hot enough. Rule of thumb: the bigger your batch, the higher the wattage you need, and the bigger the furnace. Our 10kw portable furnaces are for small batches (1-10lbs), 20kw for medium (10-50lbs), 30kw+ for industrial (50lbs+). That\u2019s not a hard rule, but it\u2019s a good starting point so you don\u2019t waste time and power.<\/p>\n

Let me throw in a real customer story to make this concrete. A couple years back, a small custom metal shop reached out to me. They were trying to melt aluminum for bike parts, but their old setup was a junk furnace they bought online, and it kept overheating, cracking their crucible, and ruining their batches. They upgraded to our 15kw portable furnace with a ceramic crucible, and now they\u2019re melting 20lbs of aluminum a day, no issues. Then last year, they wanted to move to brass for some handlebar components, so they swapped the ceramic crucible for a clay-graphite one, and that\u2019s worked great. That\u2019s the kind of thing we love to see\u2014guys growing their business with the right setup.<\/p>\n

Another common question: \u201cCan I melt scrap metal?\u201d Hell yeah, that\u2019s one of the best parts. Scrap aluminum cans, old brass pipes, copper wire, even mild steel scrap from construction sites. It\u2019s way cheaper than buying virgin metal, and you can reuse stuff that would otherwise go to a landfill. Just make sure you clean off any paint, plastic, or rust first\u2014rust can cause oxidation, paint and plastic give off toxic fumes. We\u2019ve had customers who melt 100lbs of scrap a week and save thousands a month.<\/p>\n

Wait, what about flux? I mentioned it earlier, but it\u2019s worth repeating. Flux isn\u2019t just for looks\u2014when you melt metal, it reacts with oxygen in the air and forms that cruddy oxide layer. Flux melts at a lower temp than the metal, covers the surface, and keeps oxygen out. For aluminum, use alumina flux. For brass, use borax. For steel, use a silica-based flux. We sell pre-portioned flux packs that come with our furnaces, so you don\u2019t have to guess how much to add. It\u2019s a small thing, but it makes a huge difference in the quality of your melt.<\/p>\n

Now, let\u2019s get to the stuff that trips people up: melting points vs furnace temp. A lot of new guys see aluminum melts at 1220\u00b0F, so they crank their furnace to 1500\u00b0F and wonder why it takes 2 hours to melt. Your furnace needs to be 200-300\u00b0F above the metal\u2019s melting point, to account for heat loss and the time it takes for the heat to transfer through the crucible. So for aluminum, 1400\u00b0F is perfect. For copper, 2200\u00b0F, not 1980. That\u2019s another big mistake I see all the time.<\/p>\n

What about if you want to experiment with something not on the list? Let\u2019s say you want to melt silver\u2014go for it, as long as your furnace hits 2000\u00b0F, and you use a ceramic or graphite crucible. Gold, same thing. If you want to try melting bronze, make sure you have good ventilation, because that zinc fumes I talked about? They\u2019re no joke. I always tell new folks to start with the lower-melt metals first, get the hang of controlling the furnace, dealing with flux, and then move to higher-melt stuff. No need to jump straight to steel and risk a mess.<\/p>\n

Now, I know a lot of you reading this are either hobbyists looking to get started, small shop owners wanting to scale, or even students working on a project. If you\u2019re tired of guessing what works, and you want a crucible furnace setup that\u2019s matched to your specific needs, hit me up. I\u2019ve helped hundreds of folks pick the right furnace, crucible, and add-ons for whatever they\u2019re melting\u2014no pushy sales stuff, just straight advice based on what works. Whether you\u2019re melting 5lbs of aluminum for art, or 50lbs of steel for parts, I can point you to the right setup to get the job done safely and well.<\/p>\n

Just to wrap this up, let\u2019s recap the main materials, what you need to melt \u2019em, and the furnace temps:<\/p>\n