VT machining offers CNC Turning for 347 Stainless Steel (UNS S34700 / 1.4550), typically supplied annealed. Niobium-stabilised alternative to 321, better for welded high-temperature service.
CNC Turning Notes for 347 Stainless Steel
On the lathe 347 Stainless Steel needs chip-breaker inserts and constant chip load to avoid long, stringy swarf.
For estimating, a 100 × 100 × 10 mm block of 347 Stainless Steel weighs about 0.80 kg.
Starting Parameters for CNC Turning 347 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 347 Stainless Steel, Annealed; optimised on the first article.
347 Stainless Steel Data Relevant to CNC Turning
| Equivalent designations | UNS S34700 / 1.4550 |
|---|---|
| Key composition | Cr 17-19%, Ni 9-13%, Nb ≥10×C |
| Typical supply condition | Annealed |
| Hardness (typical) | ≤92 HRB |
| Machinability rating | 36% (AISI B1112 = 100%) |
Typical values; we work to your drawing and mill certificate.
How 347 Stainless Steel Differs
Niobium-stabilised alternative to 321, better for welded high-temperature service.
Typical applications: Aircraft exhaust, refinery parts.
347 Stainless Steel vs Similar Grades
| 347 Stainless Steel | 321 Stainless Steel | 410 Stainless Steel | 317L Stainless Steel | |
|---|---|---|---|---|
| Key composition | Cr 17-19%, Ni 9-13%, Nb ≥10×C | Cr 17-19%, Ni 9-12%, Ti ≥5×C | Cr 11.5-13.5% | Cr 18-20%, Ni 11-15%, Mo 3-4% |
| Hardness | ≤92 HRB | ≤95 HRB | ~20 HRC annealed; up to ~45 HRC hardened | ≤95 HRB |
| Tensile (MPa) | ≥515 | ≥515 | ≥450 annealed | ≥515 |
| Machinability % | 36 | 36 | 55 | 32 |
| Typical use | Aircraft exhaust, refinery parts | Exhaust manifolds, aerospace ducting, expansion joints | Valve trim, pump shafts, cutlery, fasteners | Chemical process equipment, flue-gas parts |
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 347 Stainless Steel
Send a STEP/IGES model or PDF drawing, confirm 347 Stainless Steel and its condition (we usually see it supplied annealed), the quantity, critical tolerances and any finish or certificate requirements.
347 Stainless Steel in Other Processes
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Send the drawing, the 347 Stainless Steel condition and the quantity — pricing and lead time come back the same or next business day.
Request a QuoteFrequently Asked Questions
Why is 347 Stainless Steel a good choice for CNC Turning?
347 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 347 Stainless Steel turning part meets your dimensional and functional requirements.
How clean are the edges produced by CNC Turning on 347 Stainless Steel?
Machined 347 Stainless Steel edges are clean and to specification; edge-break or deburring is added when your drawing calls for it.
What is CNC Turning 347 Stainless Steel and how is it done?
CNC Turning 347 Stainless Steel refers to cNC turning rotates the workpiece against a single-point tool to produce cylindrical features, threads and grooves. Applied to 347 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 tolerances can you hold for CNC Turning 347 Stainless Steel?
Achievable tolerances for 347 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.
Which industries use CNC Turning 347 Stainless Steel parts?
CNC Turning 347 Stainless Steel parts are used across aerospace, medical, automotive, electronics, semiconductor and general industrial sectors — anywhere precise 347 Stainless Steel components are required.
Does CNC Turning 347 Stainless Steel require dedicated tooling?
Most 347 Stainless Steel turning work uses standard cutting tools and CNC programs; dedicated fixtures are made only when geometry or volume requires them.