VT machining offers CNC Turning for 321 Stainless Steel (UNS S32100 / 1.4541), typically supplied annealed. Titanium-stabilised against intergranular corrosion at 425-815 °C.
CNC Turning Notes for 321 Stainless Steel
On the lathe 321 Stainless Steel needs chip-breaker inserts and constant chip load to avoid long, stringy swarf.
For estimating, a 100 × 100 × 10 mm block of 321 Stainless Steel weighs about 0.79 kg.
Starting Parameters for CNC Turning 321 Stainless Steel
| Cutting speed (carbide) | 95-175 m/min |
|---|---|
| Feed | 0.08-0.25 mm/rev |
| Spindle speed, Ø25 mm bar | 1210-2230 rpm |
| Insert / tool class | ISO M — positive-rake PVD/CVD carbide |
| Coolant | Flood emulsion (8-10%) or high-pressure coolant |
Starting values for 321 Stainless Steel, Annealed; optimised on the first article.
321 Stainless Steel Data Relevant to CNC Turning
| Equivalent designations | UNS S32100 / 1.4541 |
|---|---|
| Key composition | Cr 17-19%, Ni 9-12%, Ti ≥5×C |
| Typical supply condition | Annealed |
| Hardness (typical) | ≤95 HRB |
| Machinability rating | 36% (AISI B1112 = 100%) |
Typical values; we work to your drawing and mill certificate.
How 321 Stainless Steel Differs
Titanium-stabilised against intergranular corrosion at 425-815 °C.
Typical applications: Exhaust manifolds, aerospace ducting, expansion joints.
321 Stainless Steel vs Similar Grades
| 321 Stainless Steel | 317L Stainless Steel | 347 Stainless Steel | 316L Stainless Steel | |
|---|---|---|---|---|
| Key composition | Cr 17-19%, Ni 9-12%, Ti ≥5×C | Cr 18-20%, Ni 11-15%, Mo 3-4% | Cr 17-19%, Ni 9-13%, Nb ≥10×C | Cr 16-18%, Ni 10-14%, Mo 2-3%, C ≤0.03% |
| Hardness | ≤95 HRB | ≤95 HRB | ≤92 HRB | ≤95 HRB |
| Tensile (MPa) | ≥515 | ≥515 | ≥515 | ≥485 |
| Machinability % | 36 | 32 | 36 | 36 |
| Typical use | Exhaust manifolds, aerospace ducting, expansion joints | Chemical process equipment, flue-gas parts | Aircraft exhaust, refinery parts | Medical devices, pharma fittings, marine welds |
More on CNC Turning Stainless Steel
Finishing options, quality documentation and general cnc turning guidance for all stainless steel grades are on our CNC Turning Stainless Steel page.
No drawing yet? Sketch the part in our free 3D + 2D builder and send it with your RFQ.
Quoting CNC Turning 321 Stainless Steel
Send a STEP/IGES model or PDF drawing, confirm 321 Stainless Steel and its condition (we usually see it supplied annealed), the quantity, critical tolerances and any finish or certificate requirements.
321 Stainless Steel in Other Processes
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Send the drawing, the 321 Stainless Steel condition and the quantity — pricing and lead time come back the same or next business day.
Request a QuoteFrequently Asked Questions
Does CNC Turning 321 Stainless Steel require dedicated tooling?
Most 321 Stainless Steel turning work uses standard cutting tools and CNC programs; dedicated fixtures are made only when geometry or volume requires them.
What is CNC Turning 321 Stainless Steel and how is it done?
CNC Turning 321 Stainless Steel refers to cNC turning rotates the workpiece against a single-point tool to produce cylindrical features, threads and grooves. Applied to 321 Stainless Steel — corrosion resistant, strong and hygienic — VT machining produces each part to your CAD drawing, selecting parameters from your tolerance, finish and quantity requirements.
Can VT machining make custom 321 Stainless Steel parts to my drawing?
Yes. 321 Stainless Steel turning is made to order from your CAD/2D drawing. Share your geometry, material grade, tolerance and quantity and we will confirm feasibility, lead time and pricing.
What is the typical lead time and minimum order for CNC Turning 321 Stainless Steel?
CNC Turning prototypes for 321 Stainless Steel can be produced quickly and scaled to series production. Send your drawing and quantity and we will advise lead time and any minimum order.