VT machining offers CNC Milling for 304L Stainless Steel (UNS S30403 / 1.4307), typically supplied annealed. Low-carbon 304 that avoids sensitisation after welding; slightly lower strength.
CNC Milling Notes for 304L Stainless Steel
304L Stainless Steel mills well with conventional strategies; finishing passes are planned to meet flatness and finish callouts.
For estimating, a 100 × 100 × 10 mm block of 304L Stainless Steel weighs about 0.79 kg.
Starting Parameters for CNC Milling 304L Stainless Steel
| Cutting speed (carbide) | 100-185 m/min |
|---|---|
| Feed per tooth | 0.028-0.088 mm |
| Spindle speed, Ø10 mm end mill | 3180-5890 rpm |
| Insert / tool class | ISO M — positive-rake PVD/CVD carbide |
| Coolant | Flood emulsion (8-10%) or high-pressure coolant |
| Thermal growth, 100 mm part, +10 °C | 16.5 µm (CTE 16.5 µm/m·K) |
Starting values for 304L Stainless Steel, Annealed; optimised on the first article.
304L Stainless Steel Data Relevant to CNC Milling
| Equivalent designations | UNS S30403 / 1.4307 |
|---|---|
| Key composition | Cr 18-20%, Ni 8-12%, C ≤0.03% |
| Typical supply condition | Annealed |
| Hardness (typical) | ≤92 HRB |
| Machinability rating | 45% (AISI B1112 = 100%) |
Typical values; we work to your drawing and mill certificate.
How 304L Stainless Steel Differs
Low-carbon 304 that avoids sensitisation after welding; slightly lower strength.
Typical applications: Welded assemblies, tanks, piping.
304L Stainless Steel vs Similar Grades
| 304L Stainless Steel | 304 Stainless Steel | 309 Stainless Steel | 303 Stainless Steel | |
|---|---|---|---|---|
| Key composition | Cr 18-20%, Ni 8-12%, C ≤0.03% | Cr 18-20%, Ni 8-10.5% | Cr 22-24%, Ni 12-15% | Cr 17-19%, Ni 8-10%, S ≥0.15% |
| Hardness | ≤92 HRB | ≤92 HRB | ≤95 HRB | ≤95 HRB |
| Tensile (MPa) | ≥485 | ≥515 | ≥515 | ≥515 |
| Machinability % | 45 | 45 | 40 | 78 |
| Typical use | Welded assemblies, tanks, piping | Food equipment, enclosures, brackets, fittings | Furnace parts, heat shields, burner components | Screw-machine parts, shafts, fittings, bushings |
More on CNC Milling Stainless Steel
Finishing options, quality documentation and general cnc milling guidance for all stainless steel grades are on our CNC Milling Stainless Steel page.
No drawing yet? Sketch the part in our free 3D + 2D builder and send it with your RFQ.
Quoting CNC Milling 304L Stainless Steel
Send a STEP/IGES model or PDF drawing, confirm 304L Stainless Steel and its condition (we usually see it supplied annealed), the quantity, critical tolerances and any finish or certificate requirements.
304L Stainless Steel in Other Processes
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Send the drawing, the 304L Stainless Steel condition and the quantity — pricing and lead time come back the same or next business day.
Request a QuoteFrequently Asked Questions
What surface finish is achievable on 304L Stainless Steel with CNC Milling?
Surface finish on 304L Stainless Steel is controlled to your specification; we confirm the achievable Ra against your callout.
What tolerances can you hold for CNC Milling 304L Stainless Steel?
Achievable tolerances for 304L Stainless Steel machining depend on the alloy, geometry and feature size. Milling holds positional and dimensional tolerances to around ±0.01 mm, tighter with precision setups. Exact figures are confirmed against your drawing callouts.
What is the typical lead time and minimum order for CNC Milling 304L Stainless Steel?
CNC Milling prototypes for 304L 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.
Can VT machining make custom 304L Stainless Steel parts to my drawing?
Yes. 304L Stainless Steel machining 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.