{"id":3530,"date":"2026-10-21T10:14:03","date_gmt":"2026-10-21T02:14:03","guid":{"rendered":"http:\/\/www.dubaiservicing.com\/blog\/?p=3530"},"modified":"2026-10-21T10:14:03","modified_gmt":"2026-10-21T02:14:03","slug":"how-to-design-sheet-metal-parts-for-high-temperature-applications-408b-b8db74","status":"publish","type":"post","link":"http:\/\/www.dubaiservicing.com\/blog\/2026\/10\/21\/how-to-design-sheet-metal-parts-for-high-temperature-applications-408b-b8db74\/","title":{"rendered":"How to design sheet metal parts for high – temperature applications?"},"content":{"rendered":"

If you\u2019re a sheet metal parts supplier, we get it\u2014designing parts that work in high temps is one of the trickiest asks we field every day. Whether it\u2019s for industrial furnaces, aerospace engine components, or oil and gas downline equipment, a part that holds up to constant heat (or extreme swings) can make or break a customer\u2019s whole operation. Skip the overcomplicated engineering jargon for a sec\u2014let\u2019s break this down like we\u2019re chatting over a shipping container coffee break, no stuffy formulas unless they\u2019re actually useful. Sheet Metal Parts<\/a><\/p>\n

<\/p>\n

First off, let\u2019s ground this: high temp applications aren\u2019t just \u201chot.\u201d There\u2019s two big buckets we deal with as a sheet metal parts supplier\u2014continuous high temp (like 600\u00b0F+ that sticks around 24\/7) and cyclic high temp (temp spikes and drops, like a furnace that turns on and off every shift). Mess this up, and you\u2019re looking at warped brackets, cracked welds, or parts that seize up way before their promised lifespan. We\u2019ve seen it too many times: a customer sends us a 10-gauge mild steel part that\u2019s supposed to handle 800\u00b0F, and it\u2019s toast in 3 months. So let\u2019s start with the most basic, most overlooked step: material selection.<\/p>\n

Don\u2019t just default to stainless steel here\u2014yes, it\u2019s heat-resistant, but not all stainless is created equal. For continuous high temps, 304 stainless works okay up to ~1500\u00b0F, but if you\u2019re pushing 1800\u00b0F or higher, 310 stainless is non-negotiable. It\u2019s got way more chromium and nickel, so it forms that tight oxide layer (the stuff that keeps oxygen from eating through the metal) way better than 304. But here\u2019s a pro tip we learned messing up a custom oven liner job a couple years back: if your application is cyclic\u2014say, going from room temp to 1700\u00b0F every 12 hours\u2014don\u2019t use solid 310. Thermal expansion (that\u2019s when metal gets bigger when hot) will cause it to crack. Instead, go for a high-nickel alloy like Inconel 625, or even a coated mild steel if the budget\u2019s tight. Wait, coated? Yeah\u2014aluminized steel is a game-changer for some jobs. It\u2019s cheaper than stainless, can handle up to 1200\u00b0F continuous, and the aluminum coating forms a protective layer that resists oxidation way better than plain steel. We\u2019ve used it for exhaust manifolds and furnace baffles, and customers usually save 20-30% without losing performance. One rule here: never use a material\u2019s \u201cmax temp\u201d rating as a hard number. Subtract 100-200\u00b0F if it\u2019s cyclic, and another 50\u00b0F if there\u2019s any load on the part (like a bracket holding heavy machinery\u2014heat makes metal weaker, so load + heat = bad combination).<\/p>\n

Next up, part geometry. Even with the right material, a bad design will fail. Thermal expansion is the silent killer here\u2014if you design a tight, rigid part that can\u2019t move when it heats up, it\u2019ll warp or crack. Let\u2019s take a simple example: a rectangular duct for a foundry exhaust system. If you weld the corners solid and don\u2019t leave any room for expansion, when it hits 1200\u00b0F, it\u2019ll bow out in the middle because the metal can\u2019t stretch evenly. How we fix that? Add expansion joints, or use a curved corner instead of a sharp one. Wait, sharp corners\u2014another no-no. Sharp points and corners act like stress raisers, and at high temps, those points become weak spots. A 90-degree bend in 10-gauge 310 stainless might hold up at room temp, but at 1800\u00b0F, the stress at the corner will cause a crack in 6 months. We always round internal corners to at least twice the material thickness if we can, and for bends, use a bend radius of at least the material thickness\u2014more if it\u2019s high temp. For thin gauge parts (like 16-gauge foil for heat shields), we use a 3x material thickness radius to prevent cracking during forming, too. Also, avoid large flat surfaces if it\u2019s a cyclic heat application. A big flat panel will expand and contract more, leading to warping. Instead, add slight corrugations or dimples to create rigidity without adding extra material. We did this for a customer\u2019s heat exchanger part last year\u2014switched from a flat 2-foot panel to a corrugated one, and their part lifespan went from 8 months to 2.5 years, no extra cost because we just tweaked the bend pattern.<\/p>\n

Welding and joining is another area where we see tons of mistakes. A lot of customers come to us with a part that\u2019s all MIG-welded, and it fails. Why? MIG welding uses filler metal that might not match the base material\u2019s heat resistance, and the heat from the weld can create a brittle zone right around the weld that cracks under cyclic stress. For high temp parts, we almost always use TIG welding instead\u2014 it\u2019s more precise, less heat input, and we can match the filler metal exactly to the base material. For example, if we\u2019re welding 310 stainless, we use 310 filler rod, not 308. For Inconel, we use Inconel 625 filler. But wait\u2014even TIG welds can go wrong. We\u2019ve had a customer reject a batch because the welds were porous. When metal heats up, those small air pockets in the weld expand and act like weak points. So for high temp welds, we do a post-weld heat treatment (PWHT) to relieve stress from welding and close up those pores. What kind of PWHT? It depends on the material: for stainless, we heat it to around 1900\u00b0F and slow cool it, for Inconel, it\u2019s around 2100\u00b0F. It adds a little time to the order, but it\u2019s 100% worth it. We even skip welding entirely sometimes\u2014use mechanical fasteners like rivets or bolts if the part is going to see a lot of thermal cycling. Riveted joints can move a tiny bit, which takes stress off, but make sure the fasteners are high temp grade too\u2014standard steel bolts will seize up at 800\u00b0F, so use Alloy 8 fasteners.<\/p>\n

Surface finish might not seem like a big deal, but it is. A lot of people think a polished surface is better, but for high temp, a matte, slightly rough surface is actually better. Wait, why? Because oxidation happens on the surface, and a rough surface gives the oxide layer more texture to grip onto\u2014so it doesn\u2019t flake off. Flaking oxide is a huge problem because those flakes can clog filters, get into moving parts, or expose new metal to oxygen. We also do a blast cleaning with alumina oxide on high temp parts before any finishing, not sandblasting with silica\u2014silica can leave residue that burns off and creates impurities. For parts that need even more protection, we use ceramic coating. It\u2019s a thin layer, adds almost no weight, and can handle up to 2500\u00b0F. We used it for a customer\u2019s rocket engine heat shield brackets, and they\u2019ve been going strong for 3 years now, no oxidation. Don\u2019t overdo the coating though\u2014some coatings can crack when the metal expands, so we test every coating on a sample first to make sure it\u2019s compatible with the material.<\/p>\n

Now, let\u2019s talk about testing\u2014because no design is perfect until you test it. As a sheet metal parts supplier, we don\u2019t just cut metal and ship it out. For high temp parts, we do in-house tests first: put a sample in our temp-controlled oven, run it through 100 heat cycles (room temp to max temp) and check for warping, cracks, or oxidation. We also test load-bearing parts by putting a stress load on them while they\u2019re hot, to make sure they don\u2019t break. Last year, a customer sent us a design for a furnace door hinge\u2014we tested the first sample, and the pin (standard steel) seized up at 900\u00b0F. Instead of just telling them \u201cit won\u2019t work,\u201d we swapped the pin for a high temp alloy pin and retested, which worked. That\u2019s the kind of value we bring, not just cutting metal. Common test mistakes we see customers make: testing only at continuous temp, not cyclic. A part that works for 1000 hours at constant 1500\u00b0F might fail in 100 hours if it cycles between 1500 and room temp every day. So make sure your test conditions match the actual application.<\/p>\n

Wait, let\u2019s cover some common mistakes we see all the time, just to wrap this up. First, using too thin a material. It\u2019s tempting to go thinner to save cost, but thin metal expands and contracts way more, leading to warping. We always tell customers: for high temp parts, add 1 gauge if it\u2019s cyclic. Second, ignoring corrosion. Wait, high temp isn\u2019t just heat\u2014if there\u2019s moisture or chemicals (like in oil and gas), you\u2019ve got high temp corrosion too. 310 stainless will work great for dry heat, but if there\u2019s sulfur or chlorine, you need a material like Hastelloy C276, which is way more resistant to chemical corrosion at high temps. Third, not accounting for part size. A 4-foot long part will expand 2x as much as a 2-foot part, so you need way more expansion room. We had a customer design a 6-foot long exhaust duct that was too tight at the ends\u2014when it hit 1200\u00b0F, it bowed 2 inches in the middle. We added 1 inch of expansion space at each end, and that fixed it.<\/p>\n

<\/p>\n

At the end of the day, designing sheet metal parts for high temp isn\u2019t just about picking the right metal. It\u2019s about thinking through the whole life of the part: how it heats and cools, what it\u2019s holding, what it\u2019s exposed to, and how it\u2019s joined. As a sheet metal parts supplier, we\u2019ve spent years learning these lessons the hard way\u2014messing up a batch, reworking a design, testing until it works. If you\u2019re working on a high temp project and your design isn\u2019t holding up, or you\u2019re starting from scratch and need someone who actually gets high temp sheet metal, hit us up to talk through your needs. We\u2019re not just here to cut parts\u2014we\u2019re here to make sure your part works, even when the heat is on.<\/p>\n

Sheet Metal Parts<\/a> References:<\/p>\n

    \n
  1. ASME Boiler and Pressure Vessel Code, Section II: Material Specifications for High-Temperature Service<\/li>\n
  2. Kalpakjian, S., Schmid, S.R. (2020). Manufacturing Processes for Engineering Materials, 7th Edition. Pearson Education<\/li>\n
  3. International Organization for Standardization (ISO) 15793:2014, Metallic Materials for High-Temperature Application \u2013 Selection and Testing Guidelines<\/li>\n
  4. Data Sheet for Inconel 625 Nickel-Chromium Alloy, Special Metals Corporation, 2022<\/li>\n
  5. Sheet Metal Forming for High-Temperature Components, Fabricator\u2019s Guide, Precision Metalforming Association, 2021<\/li>\n<\/ol>\n
    \n

    Hebei Kailu Hardware Manufacturing Co., Ltd.<\/a>
    We’re well-known as one of the leading sheet metal parts manufacturers and suppliers in China, also support customized service. Welcome to buy high quality sheet metal parts made in China here and get free sample from our factory. For price consultation, contact us.
    Address: Yaojiubo Village, Nanpi Town, Nanpi County, Cangzhou City, Hebei Province
    E-mail: 714184486@qq.com
    WebSite:     https:\/\/www.weldedpart.com\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

    If you\u2019re a sheet metal parts supplier, we get it\u2014designing parts that work in high temps … How to design sheet metal parts for high – temperature applications?<\/span>Read more<\/a><\/p>\n","protected":false},"author":770,"featured_media":3530,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[3493],"class_list":["post-3530","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry","tag-sheet-metal-parts-4e25-b910ab"],"_links":{"self":[{"href":"http:\/\/www.dubaiservicing.com\/blog\/wp-json\/wp\/v2\/posts\/3530","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.dubaiservicing.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.dubaiservicing.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.dubaiservicing.com\/blog\/wp-json\/wp\/v2\/users\/770"}],"replies":[{"embeddable":true,"href":"http:\/\/www.dubaiservicing.com\/blog\/wp-json\/wp\/v2\/comments?post=3530"}],"version-history":[{"count":0,"href":"http:\/\/www.dubaiservicing.com\/blog\/wp-json\/wp\/v2\/posts\/3530\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.dubaiservicing.com\/blog\/wp-json\/wp\/v2\/posts\/3530"}],"wp:attachment":[{"href":"http:\/\/www.dubaiservicing.com\/blog\/wp-json\/wp\/v2\/media?parent=3530"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.dubaiservicing.com\/blog\/wp-json\/wp\/v2\/categories?post=3530"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.dubaiservicing.com\/blog\/wp-json\/wp\/v2\/tags?post=3530"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}