"315" is not one of the widely published AISI/UNS wrought stainless designations — it doesn't appear in major standard cross-reference databases alongside grades like 304, 309, or 316, and no verified Werkstoffnummer, DIN/EN, or JIS equivalent could be confirmed for it. Based on the composition on file, it's a chromium-nickel-molybdenum austenitic alloy with roughly 17.5% chromium, 10% nickel, and 1.25–1.75% molybdenum — a profile that sits close to standard 316 but with somewhat less nickel and a narrower molybdenum range.

Given that overlap, 315 likely behaves similarly to 316 in both corrosion resistance and machining response: the molybdenum addition should provide meaningfully better resistance to pitting and crevice corrosion than plain 304, while the alloy retains the family's typical gumminess and work-hardening tendency under a cutting tool. Because its formal standard designation could not be confirmed, treat the values on this page as a general reference point rather than a certified specification, and verify against your mill certification or purchase order documentation for critical applications.

Given a chemistry close to 316's, this alloy should be expected to machine similarly: gummy chip flow, rapid work hardening under a rubbing or dull tool, and cutting forces somewhat higher than plain 304 because of the added molybdenum. Low thermal conductivity keeps heat concentrated at the cutting edge rather than moving off into the chip, which is why insert wear on austenitic grades like this tends to show up as cratering rather than gradual, predictable flank wear.

The same fundamentals that apply across the whole austenitic family apply here: sharp, positive-rake inserts that shear the material instead of pushing it, feed rates that stay consistently ahead of any work-hardened layer, and a coating and substrate matched to molybdenum-bearing stainless rather than a general-purpose grade. Because the exact alloy specification isn't fully confirmed, start with conservative parameters and adjust based on actual cutting performance rather than assuming this material behaves identically to certified 316.

Chip control follows the family pattern of long, tough, continuous chips, so a chipbreaker geometry suited to stainless and steady coolant flow remain important for keeping the cut clean and protecting the edge.