VT machining offers CNC Milling for 317L Stainless Steel (UNS S31703 / 1.4438), typically supplied annealed. More Mo than 316L for harsher chemical service.
CNC Milling Notes for 317L Stainless Steel
We use high-efficiency toolpaths with constant engagement on 317L Stainless Steel to keep cutting temperature and tool wear under control.
For estimating, a 100 × 100 × 10 mm block of 317L Stainless Steel weighs about 0.80 kg.
Starting Parameters for CNC Milling 317L Stainless Steel
| Cutting speed (carbide) | 75-135 m/min |
|---|---|
| Feed per tooth | 0.028-0.088 mm |
| Spindle speed, Ø10 mm end mill | 2390-4300 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 317L Stainless Steel, Annealed; optimised on the first article.
317L Stainless Steel Data Relevant to CNC Milling
| 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 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 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 Milling 317L Stainless Steel?
Achievable tolerances for 317L 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.
Why is 317L Stainless Steel a good choice for CNC Milling?
317L Stainless Steel is corrosion resistant, strong and hygienic, which makes it well suited to CNC Milling. We tune the process to the alloy so the finished 317L Stainless Steel machining part meets your dimensional and functional requirements.
Does CNC Milling 317L Stainless Steel require dedicated tooling?
Most 317L Stainless Steel machining work uses standard cutting tools and CNC programs; dedicated fixtures are made only when geometry or volume requires them.
What is CNC Milling 317L Stainless Steel and how is it done?
CNC Milling 317L Stainless Steel refers to multi-axis milling cutters remove material to produce prismatic features, pockets, slots and contoured 3D surfaces. Applied to 317L 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.
What surface finish is achievable on 317L Stainless Steel with CNC Milling?
Surface finish on 317L Stainless Steel is controlled to your specification; we confirm the achievable Ra against your callout.