Hey there, fellow metalworkers, fabricators, and anyone who’s ever stared at a chunk of hot work tool steel and thought “how do I even start cutting this?” If you’ve worked with this stuff before, you already know it’s the backbone of so many industries—die casting, forging, extrusion, all that heavy-duty manufacturing that keeps our world moving. As someone who’s been in the hot work tool steel game for over a decade (let’s be real, I’ve got the calluses and the gray hair to prove it), I’ve seen so many folks mess up cuts on this steel because they think it’s just like cutting regular mild steel. Spoiler: it’s not. Hot work tool steel is tough, it’s wear-resistant, and it’s designed to hold up under insane heat and pressure—so cutting it requires a little know-how, not just brute force. Today, I’m breaking down exactly how to cut it right, no nonsense, and no fancy tricks that’ll just waste your time or your material. Hot Work Tool Steel
First, let’s get one thing straight: hot work tool steel isn’t a single metal. There are different grades—like H11, H13, W1, S7—each with their own little quirks when it comes to cutting. H13 is probably the most common, right? It’s the go-to for extrusion dies and forging punches because it balances toughness and heat resistance like no other. S7, on the other hand,’s more shock-resistant, good for things like chisels and punches that take a beating. And H11’s a little harder than H13, so it needs slightly different settings. I bring this up because a lot of guys I talk to just grab their same-old saw blade and start cutting, regardless of grade, and wonder why their blades are toast after 10 minutes. Yeah, I’ve been there too—first year in the business, I burned through three carbide-tipped blades cutting H11 because I didn’t adjust for the grade. Don’t be that guy.
Let’s start with the biggest question: what cutting method actually works? I’ve tested almost every method out there, and there are three that stand head and shoulders above the rest for hot work tool steel. Let’s break ‘em down, no jargon.
First up: bandsawing. This is the bread and butter for most of us, right? It’s versatile, great for straight cuts, and works for everything from small bar stock to big chunks. But here’s the thing—you can’t use a regular bandsaw blade. Hot work tool steel is hard, so you need something that’s up to the task. I swear by carbide-tipped blades, specifically ones with a fine tooth pitch. Wait, what’s fine tooth pitch? That means more teeth per inch (TPI) on the blade. For most hot work tool steel, 4-6 TPI works if you’re cutting thicker stock (like 2 inches or more), and 6-8 TPI for thinner stuff. Why? Too few teeth and they’ll chatter, which ruins your cut and wears out the blade fast. Too many, and they’ll clog up with chips, overheat, and snap. Trust me, I’ve messed with 10 TPI blades on H13 before—total disaster.
Also, speed matters so much here. A lot of guys run their bandsaw too fast, thinking more speed = faster cuts. No way. Hot work tool steel needs a slow, steady feed. I usually set my bandsaw to 50-70 surface feet per minute (SFPM) for H13, and even lower for harder grades like H11—like 30-50 SFPM. Feed rate should be around 0.015-0.03 inches per tooth. If you see blue chips coming off, that means you’re going too fast and overheating the blade. Stop, slow it down. And don’t skip the coolant! I use a synthetic cutting fluid, not just water, because it keeps the blade cool and flushes away the metal chips. If you’re cutting dry, you’ll burn the edge of the steel, make it brittle, and your blade will be gone in an hour. I learned that the hard way on a big block of S7—ended up having to re-grind the entire edge because the dry cut left a hard spot.
Second method: laser cutting. Wait, I know, some small shops don’t have a laser cutter, but if you’ve got access to one, it’s a game-changer for complex shapes. But again, hot work tool steel’s different from regular steel. The problem with laser cutting hot work tool steel is that it’s often coated or has a high alloy content, right? H13, for example, has chromium and molybdenum in it, which can mess with the laser’s focus if you don’t adjust settings. I’ve worked with a few fabricators that use fiber lasers (not CO2, those don’t work as well here) for intricate parts, and they swear by it. The key here is power: you need enough power to pierce the steel, but not so much that it causes warping. For 1-inch H13, 1500-2000 watts works, with a cutting speed of around 500-800 mm/min. Also, use assist gas—nitrogen, not compressed air. Compressed air leaves a lot of dross (that cruddy leftover metal on the edge) and can oxidize the cut. Nitrogen keeps the edge clean, so you don’t have to do a lot of secondary grinding. Just a heads up, though—laser cutting hot work tool steel can leave a slightly harder edge (called a heat-affected zone, or HAZ), so if you’re using the part for something critical, like a die, you’ll need to grind that HAZ off later. No biggie, just something to keep in mind.
Third method: waterjet cutting. This is my underdog pick. If you don’t want any HAZ, no warping, and super clean cuts, waterjet is the way to go. It uses high-pressure water mixed with abrasive garnet to cut through almost anything, and since there’s no heat involved, there’s no hardening or warping of the steel. That’s a huge plus for parts where dimensional accuracy is key. I use waterjet for prototypes all the time, because I don’t have to worry about messing up a new design. The only downside? It’s slower than bandsawing or laser, and it’s not great for super thick stock (over 6 inches, it starts to get pricey). But for most small to medium parts, it’s perfect. Just make sure you use the right abrasive—80 mesh garnet works best for hot work tool steel, and keep the pressure around 40,000-50,000 PSI. I’ve had fabricators come to me saying they ruined a die block with a bandsaw, then fixed it with a waterjet. It’s that reliable.
Now, let’s talk about what NOT to do, because I see these mistakes all the time. First, don’t use a hacksaw for thick hot work tool steel. Yeah, it works for thin stuff, but anything over 1/4 inch will make your arm hurt, your blade snap, and the cut will be all crooked. I once tried to cut a 1-inch H13 bar with a hacksaw for a custom part—took me 2 hours, and the cut was off by 1/8 inch. Total waste of time. Second, don’t skip preheating if you’re cutting thick stock. Wait, when is preheating needed? If you’re cutting a block that’s more than 4 inches thick, especially if it’s a hard grade like H11, preheating the area around the cut to 200-300°F helps prevent thermal shock. Thermal shock happens when the hot cut area meets the cold rest of the steel, and it can cause cracks. I learned that when I cut a 6-inch block of S7—no preheating, got a tiny crack in the edge, had to scrap the whole block. Not fun. Third, don’t forget to deburr your cuts. Hot work tool steel’s edges are sharp, and the dross left from some cutting methods can be hard too. Use a file, a flap disc, or a brush to get rid of that crud—otherwise, you’ll nick yourself, or the part won’t fit where it’s supposed to go.
Wait, let’s circle back to being a hot work tool steel supplier, because that’s my angle here. I talk to so many customers who say “I just buy whatever steel’s cheap,” but the cutting ability depends a lot on the grade and the mill’s heat treatment. A lot of cheap hot work tool steel is under-tempered, which makes it way harder to cut than properly tempered material. That’s why we make sure every bar and block we sell is heat treated to the exact specification—so it’s tough enough for the job, but not so hard that it’s impossible to cut without ruining your tools. I’ve had customers switch to our H13 from a cheaper supplier, and their blade life went up by 30% because the steel was properly tempered. That’s the kind of stuff that makes a difference, not just selling metal—it’s selling metal that works with you, not against you.
Another tip: if you’re doing a lot of cutting, invest in good tooling. Cheap blades, cheap abrasive, cheap nozzles on your laser or waterjet—they cost you more in the long run. I’ve seen a fabricator save $5 on a bandsaw blade, then have to replace their motor because the cheap blade vibrated so much. Don’t do that. Spend a little more up front on quality tooling, and you’ll save hours and hundreds of dollars later.
Let’s wrap this up with a quick cheat sheet, so you don’t have to remember all this: For bandsawing: carbide blade, 4-8 TPI, slow speed (30-70 SFPM), synthetic coolant. For laser cutting: fiber laser, nitrogen assist gas, 1500-2000W for 1-inch stock, remove HAZ. For waterjet: 80 mesh garnet, 40k-50k PSI, no HAZ, great for prototypes. Mistakes to avoid: skipping coolant, cutting too fast, under-tempered steel, no deburring.
At the end of the day, cutting hot work tool steel isn’t rocket science, but it does require paying attention to the details. If you’re using the right method for your grade and your part, you’ll get clean cuts, longer tool life, and less wasted material. If you’re ever in the market for hot work tool steel that’s cuttable, reliable, and fits exactly what you need, hit us up. We don’t just sell metal—we help you figure out the best way to work with it, because that’s what this industry’s all about.
When you’re working with hot work tool steel, don’t cut corners on preparation or technique. It’s a high-performance material, so treat it like one, and it’ll hold up to whatever you throw at it. Now go make some great parts.
Cold Work Steel References:
- ASM International, “Machining of Tool Steels”, Tool Materials and Applications, 2019.
- Band Saw Blade Selection Guide, Industrial Metal Supply, 2022.
- Laser Cutting Parameters for Alloy Steels, Fiber Laser Technology Association, 2021.
- Waterjet Cutting of Hard Metals, Abrasive Waterjet Manufacturers Association, 2020.
- Tool Steel Heat Treatment Fundamentals, Society of Manufacturing Engineers, 2018.
Kunshan Guanghouhong Mold Materials Co., Ltd.
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