215 is a specialty austenitic stainless steel that, unlike the low-nickel 201/202 economy grades, carries a nickel content closer to 10% along with a molybdenum addition. That combination puts it in a different niche than the cost-reduction Cr-Mn-Ni grades: the higher nickel supports better ductility and toughness, while the molybdenum addition improves resistance to pitting and crevice corrosion in chloride-bearing environments, similar in principle to what Mo does for 316 over 304. Manganese is still present at a meaningful level (roughly 5.5-7%), so nitrogen and manganese continue to play a role in the austenite stability and strength of this grade, just alongside a fuller nickel content rather than instead of it.

215 does not have a widely published DIN/EN/JIS cross-reference in general steel standards literature — it appears to be used as a specialty or mill-specific designation rather than a grade carried across every international standard. Treat it as a Cr-Ni-Mn austenitic with the composition below, and confirm exact standard equivalents against mill certification if a specific national standard cross-reference is required for your application.

No widely published international standard cross-reference was found for this designation — confirm exact composition against mill certification for critical applications.

215 machines much like other austenitic stainless steels: it's non-heat-treatable, so all of its strength comes from cold work, and any rubbing or dwelling at the cutting edge work-hardens the surface it touches. The higher nickel content relative to the economy 200-series grades gives 215 more ductility and toughness, which generally means somewhat gummier chip behavior and a greater tendency toward built-up edge than a leaner, lower-nickel grade — closer in feel to 316 than to 201 or 202. The molybdenum addition also adds some abrasive wear on top of the adhesive wear typical of austenitic grades.

Sharp, positive-rake tooling that shears rather than rubs is the baseline approach, the same as for any austenitic stainless. Keep feed rates decisive enough to avoid burnishing, use coolant to manage both heat and chip welding at the cutting edge, and select an insert grade and chipbreaker geometry designed for stainless rather than a general carbon-steel option, since 215's chips tend to be long and stringy like other grades in this family.

Assumes a well-matched insert grade, rigid tool and workpiece clamping, good-quality raw material, short tool overhang.

Turning

Parting / Grooving

Milling