VT machining offers CNC Turning for 309S Stainless Steel (UNS S30908 / 1.4833), typically supplied annealed. Low-carbon 309 for better weldability in high-temperature fabrications.
CNC Turning Notes for 309S Stainless Steel
On the lathe 309S Stainless Steel needs chip-breaker inserts and constant chip load to avoid long, stringy swarf.
For estimating, a 100 × 100 × 10 mm block of 309S Stainless Steel weighs about 0.79 kg.
Starting Parameters for CNC Turning 309S Stainless Steel
| Cutting speed (carbide) | 105-195 m/min |
|---|---|
| Feed | 0.08-0.25 mm/rev |
| Spindle speed, Ø25 mm bar | 1340-2480 rpm |
| Insert / tool class | ISO M — positive-rake PVD/CVD carbide |
| Coolant | Flood emulsion (8-10%) or high-pressure coolant |
Starting values for 309S Stainless Steel, Annealed; optimised on the first article.
309S Stainless Steel Data Relevant to CNC Turning
| Equivalent designations | UNS S30908 / 1.4833 |
|---|---|
| Key composition | Cr 22-24%, Ni 12-15%, C ≤0.08% |
| Typical supply condition | Annealed |
| Hardness (typical) | ≤95 HRB |
| Machinability rating | 40% (AISI B1112 = 100%) |
Typical values; we work to your drawing and mill certificate.
How 309S Stainless Steel Differs
Low-carbon 309 for better weldability in high-temperature fabrications.
Typical applications: Kiln fixtures, heat-treat baskets.
309S Stainless Steel vs Similar Grades
| 309S Stainless Steel | 309 Stainless Steel | 310 Stainless Steel | 304L Stainless Steel | |
|---|---|---|---|---|
| Key composition | Cr 22-24%, Ni 12-15%, C ≤0.08% | Cr 22-24%, Ni 12-15% | Cr 24-26%, Ni 19-22% | Cr 18-20%, Ni 8-12%, C ≤0.03% |
| Hardness | ≤95 HRB | ≤95 HRB | ≤95 HRB | ≤92 HRB |
| Tensile (MPa) | ≥515 | ≥515 | ≥515 | ≥485 |
| Machinability % | 40 | 40 | 36 | 45 |
| Typical use | Kiln fixtures, heat-treat baskets | Furnace parts, heat shields, burner components | Furnace components, radiant tubes | Welded assemblies, tanks, piping |
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 309S Stainless Steel
Send a STEP/IGES model or PDF drawing, confirm 309S Stainless Steel and its condition (we usually see it supplied annealed), the quantity, critical tolerances and any finish or certificate requirements.
309S Stainless Steel in Other Processes
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Send the drawing, the 309S Stainless Steel condition and the quantity — pricing and lead time come back the same or next business day.
Request a QuoteFrequently Asked Questions
What is the typical lead time and minimum order for CNC Turning 309S Stainless Steel?
CNC Turning prototypes for 309S 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.
What material thickness or size range suits CNC Turning 309S Stainless Steel?
Turned 309S Stainless Steel parts are produced from bar or chuck stock across a wide diameter range.
What is CNC Turning 309S Stainless Steel and how is it done?
CNC Turning 309S Stainless Steel refers to cNC turning rotates the workpiece against a single-point tool to produce cylindrical features, threads and grooves. Applied to 309S 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.
Why is 309S Stainless Steel a good choice for CNC Turning?
309S 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 309S Stainless Steel turning part meets your dimensional and functional requirements.
Which industries use CNC Turning 309S Stainless Steel parts?
CNC Turning 309S Stainless Steel parts are used across aerospace, medical, automotive, electronics, semiconductor and general industrial sectors — anywhere precise 309S Stainless Steel components are required.