Feed & Speed Calculator for Stainless Steel 316
Everything that makes 304 tricky, plus more — 316's added molybdenum improves corrosion resistance and makes it noticeably gummier to cut.
316 stainless starting ranges
| Tool | Cutting speed (SFM) | Chip load, 1/2" 4-flute (in) |
|---|---|---|
| Carbide (coated) | 150–300 | 0.002–0.004 |
| HSS | 30–60 | 0.0015–0.003 |
Run toward the low end of these ranges compared to 304 — 316 generates more heat and work-hardens more readily for the same cut.
Why 316 cuts differently from 304 despite looking similar on paper
316 adds molybdenum (and usually a bit more nickel) specifically for better corrosion resistance in chloride-rich environments — marine hardware, medical, and food-contact parts commonly specify it for exactly that reason. That same alloying makes it gummier and more prone to built-up edge and work hardening than 304, even though the two look nearly identical by eye and are often substituted casually when they shouldn't be.
Same work-hardening rule as 304, just less margin for error
Everything that matters in 304 — constant feed, no dwelling, sharp tools, adequate chip load — matters even more in 316. A pass that would just barely get away with rubbing in 304 is more likely to leave a genuinely hardened skin in 316, which then compounds tool wear on the next pass.
If a print calls out 316 specifically, don't substitute 304 numbers
Because they look alike and are dimensionally interchangeable, it's easy to assume 304's feeds and speeds are "close enough" for 316 — in practice, running 316 at 304 numbers pushes speed and chip load past what 316 tolerates well, showing up as faster tool wear or a rougher finish than expected.
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