VT machining offers CNC Turning for 317L Stainless Steel (UNS S31703 / 1.4438), typically supplied annealed. More Mo than 316L for harsher chemical service.
CNC Turning Notes for 317L Stainless Steel
On the lathe 317L Stainless Steel needs chip-breaker inserts and constant chip load to avoid long, stringy swarf.
For estimating, a 100 × 100 × 10 mm block of 317L Stainless Steel weighs about 0.80 kg.
Starting Parameters for CNC Turning 317L Stainless Steel
| Cutting speed (carbide) | 85-155 m/min |
|---|---|
| Feed | 0.08-0.25 mm/rev |
| Spindle speed, Ø25 mm bar | 1080-1970 rpm |
| Insert / tool class | ISO M — positive-rake PVD/CVD carbide |
| Coolant | Flood emulsion (8-10%) or high-pressure coolant |
Starting values for 317L Stainless Steel, Annealed; optimised on the first article.
317L Stainless Steel Data Relevant to CNC Turning
| Equivalent designations | UNS S31703 / 1.4438 |
|---|---|
| Key composition | Cr 18-20%, Ni 11-15%, Mo 3-4% |
| Typical supply condition | Annealed |
| Hardness (typical) | ≤95 HRB |
| Machinability rating | 32% (AISI B1112 = 100%) |
Typical values; we work to your drawing and mill certificate.
How 317L Stainless Steel Differs
More Mo than 316L for harsher chemical service.
Typical applications: Chemical process equipment, flue-gas parts.
317L Stainless Steel vs Similar Grades
| 317L Stainless Steel | 316L Stainless Steel | 321 Stainless Steel | 316 Stainless Steel | |
|---|---|---|---|---|
| Key composition | Cr 18-20%, Ni 11-15%, Mo 3-4% | Cr 16-18%, Ni 10-14%, Mo 2-3%, C ≤0.03% | Cr 17-19%, Ni 9-12%, Ti ≥5×C | Cr 16-18%, Ni 10-14%, Mo 2-3% |
| Hardness | ≤95 HRB | ≤95 HRB | ≤95 HRB | ≤95 HRB |
| Tensile (MPa) | ≥515 | ≥485 | ≥515 | ≥515 |
| Machinability % | 32 | 36 | 36 | 36 |
| Typical use | Chemical process equipment, flue-gas parts | Medical devices, pharma fittings, marine welds | Exhaust manifolds, aerospace ducting, expansion joints | Marine hardware, pump and valve parts, medical |
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 317L Stainless Steel
Send a STEP/IGES model or PDF drawing, confirm 317L Stainless Steel and its condition (we usually see it supplied annealed), the quantity, critical tolerances and any finish or certificate requirements.
317L Stainless Steel in Other Processes
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Send the drawing, the 317L Stainless Steel condition and the quantity — pricing and lead time come back the same or next business day.
Request a QuoteFrequently Asked Questions
What tolerances can you hold for CNC Turning 317L Stainless Steel?
Achievable tolerances for 317L Stainless Steel turning depend on the alloy, geometry and feature size. Turning holds diameter tolerances to around ±0.005 mm with concentricity within 0.01 mm. Exact figures are confirmed against your drawing callouts.
Does CNC Turning 317L Stainless Steel require dedicated tooling?
Most 317L Stainless Steel turning work uses standard cutting tools and CNC programs; dedicated fixtures are made only when geometry or volume requires them.
Why is 317L Stainless Steel a good choice for CNC Turning?
317L Stainless Steel is corrosion resistant, strong and hygienic, which makes it well suited to CNC Turning. We tune the process to the alloy so the finished 317L Stainless Steel turning part meets your dimensional and functional requirements.
Which industries use CNC Turning 317L Stainless Steel parts?
CNC Turning 317L Stainless Steel parts are used across aerospace, medical, automotive, electronics, semiconductor and general industrial sectors — anywhere precise 317L Stainless Steel components are required.