Quick Answer
Stainless and duplex steel need heat-controlled, often cold cutting-based beveling to protect their microstructure and corrosion resistance. Hardox and wear-resistant steels are tougher on tooling and need slower feeds. Carbon steel and aluminum are the most forgiving with standard tooling.
Not every plate bevels the same way. Stainless behaves differently under a cutter than Hardox, and duplex steel has its own quirks entirely. Before getting into why, here's the short version — then the metallurgy behind each material.
Quick Reference: What Needs Special Handling
Needs Special Handling
- Stainless Steel — controlled heat input protects corrosion resistance
- Duplex Steel — heat-sensitive microstructure, favor cold cutting methods
- Hardox / Wear-Resistant Steel — tougher on tooling, slower feed rates needed
Runs on Standard Setups
- Carbon & Mild Steel — most forgiving, standard tooling across methods
- Aluminum — softer, may need adjusted feed to avoid smearing
Stainless Steel
Stainless steel benefits from controlled heat input during beveling to avoid discoloration and to help preserve the corrosion-resistant surface. Cold, cutting-based methods like milling-type wheel-head beveling are often preferred over heat-intensive processes for this reason. There's also a grade-level distinction worth knowing: 304 stainless is the most common general-purpose grade, while 316 adds molybdenum for meaningfully better resistance to chlorides — the reason it shows up more often in marine, chemical, and food-processing fabrication. Both grades respond to heat and cold work in broadly similar ways during beveling, but 316's higher alloy content makes it somewhat tougher on tooling than 304.
Hardox and Wear-Resistant Steel
Hardox and similar high-hardness, wear-resistant steels are tougher on cutting tools than mild steel, generally calling for slower feed rates and more robust tooling to maintain a clean, consistent bevel without excessive tool wear. These grades are sold by hardness class — Hardox 400, 450, and 500 correspond to roughly 370–430, 425–475, and 470–540 Brinell hardness respectively, per the manufacturer's published ranges — and the harder the grade, the more that tooling life and feed rate need adjusting downward compared to a structural mild steel job.
Duplex Steel
Duplex stainless steel combines an austenitic-ferritic microstructure, roughly balanced 50/50 between the two phases, which is what gives it both higher strength and strong corrosion resistance compared to standard austenitic stainless. A common grade like 2205 duplex runs around 22% chromium, 5% nickel, and 3% molybdenum. Corrosion performance in these grades is often referenced by PREN (Pitting Resistance Equivalent Number), calculated roughly as %Cr + 3.3×%Mo + 16×%N — a higher PREN means better resistance to pitting and crevice corrosion, particularly in chloride-rich environments. The catch for fabrication: excessive heat input during beveling can disturb that balanced austenite-ferrite ratio, shifting the microstructure and reducing the very properties duplex is chosen for. As with standard stainless, controlled, lower-heat beveling methods are generally favored to keep that balance intact.
Carbon and Mild Steel
Carbon and mild steel are the most common materials in structural beveling work and are generally the most forgiving — standard tooling and feed rates across milling, rolling, or portable methods handle them well. Structural sections are commonly specified to grades like ASTM A36 or equivalent, and surface condition (hot-rolled with mill scale vs. cleaner cold-rolled stock) has a modest effect on initial tool wear but little effect on achievable bevel quality.
Aluminum
Aluminum is softer than steel and can behave differently under a beveling cutter, sometimes requiring adjusted feed rates and tooling to avoid smearing or excessive burr formation at the new edge. Common structural and enclosure alloys like 5083 and 6061 are the ones fabricators run most often. Aluminum's high thermal conductivity means heat dissipates quickly during cutting, which lowers the risk of the kind of heat-affected discoloration seen on stainless — but if the feed rate is too slow relative to the tool, aluminum's softness can lead to material building up on the cutting edge rather than shearing cleanly.
Tooling and Feed-Rate Guidance by Hardness
Put simply, the harder or more heat-sensitive the material, the more feed rate and tooling selection matter relative to a baseline mild-steel setup: Hardox and other wear-resistant grades call for slower feeds and tougher tooling purely because of hardness, while stainless and duplex call for controlled heat input and often cold cutting-based methods to protect their metallurgy rather than their raw hardness. Aluminum sits at the opposite end — soft and heat-tolerant, but sensitive to feed rates that are too slow rather than too fast. A wheel-head beveling machine with adjustable feed and a defined angle range, like PCL's MDC-Series, covers this full range of materials without needing a dedicated setup per metal — the adjustment is in feed rate and technique, not a different machine.
Material Certification and Traceability
For structural, pressure, or marine work, the metal itself usually arrives with a mill test certificate (MTC) documenting its exact chemical composition and mechanical properties for that specific heat or lot — commonly issued per EN 10204, at either a 2.2 (non-specific test report) or 3.1 (specific, third-party-witnessed) level depending on what the project requires. This matters more for alloys like duplex, Hardox, or higher-grade stainless than for generic mild steel, since their performance depends on hitting a fairly tight composition and hardness window — a duplex plate slightly outside spec on molybdenum content, for instance, won't deliver the PREN its designer assumed. Keeping the MTC traceable back to the specific plate that was beveled and welded is standard practice on code-governed jobs, and it's worth confirming before beveling starts, not after the joint is already welded shut.
Frequently Asked Questions
Not necessarily special tooling, but many shops favor cold, cutting-based beveling methods and controlled feed rates to limit heat input and protect the stainless surface finish.
Yes, generally. Hardox and other wear-resistant steels are tougher on cutting tools, often requiring slower feeds and more robust tooling than mild steel.
Many beveling machines can process a range of metals, but feed rate, tooling, and sometimes the beveling method itself may need adjustment between materials.
PREN (Pitting Resistance Equivalent Number) estimates how resistant a stainless or duplex grade is to pitting and crevice corrosion based on its chromium, molybdenum, and nitrogen content. A higher PREN generally means better performance in chloride-rich environments, which is one reason duplex grades are chosen for demanding applications.
It depends on the grade: Hardox 400, 450, and 500 correspond to roughly 370–430, 425–475, and 470–540 Brinell hardness respectively, per the manufacturer's published ranges. Higher grades require slower feed rates and more robust tooling during beveling.
Duplex relies on a roughly balanced austenite-ferrite microstructure for its combined strength and corrosion resistance. Excess heat during beveling can shift that balance, so controlled, lower-heat cutting methods matter even more for duplex than for standard austenitic stainless grades like 304 or 316.
It matters for both. Confirming the plate's actual chemistry and hardness against its MTC before beveling helps ensure the feed rate and tooling you plan to use actually match the material in hand, rather than an assumed generic grade.
Not always — 316's added molybdenum improves chloride resistance, which matters in marine or chemical exposure, but it also costs more and is slightly tougher on tooling. For general indoor fabrication without chloride exposure, 304 is usually the more economical choice.
