VT machining offers CNC Milling for 347 Stainless Steel (UNS S34700 / 1.4550), typically supplied annealed. Niobium-stabilised alternative to 321, better for welded high-temperature service.
CNC Milling Notes for 347 Stainless Steel
347 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 347 Stainless Steel weighs about 0.80 kg.
Starting Parameters for CNC Milling 347 Stainless Steel
| Cutting speed (carbide) | 80-150 m/min |
|---|---|
| Feed per tooth | 0.028-0.088 mm |
| Spindle speed, Ø10 mm end mill | 2550-4770 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 347 Stainless Steel, Annealed; optimised on the first article.
347 Stainless Steel Data Relevant to CNC Milling
| 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 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 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
How clean are the edges produced by CNC Milling 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.
Does CNC Milling 347 Stainless Steel require dedicated tooling?
Most 347 Stainless Steel machining work uses standard cutting tools and CNC programs; dedicated fixtures are made only when geometry or volume requires them.
Can VT machining make custom 347 Stainless Steel parts to my drawing?
Yes. 347 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.
What is the typical lead time and minimum order for CNC Milling 347 Stainless Steel?
CNC Milling prototypes for 347 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 tolerances can you hold for CNC Milling 347 Stainless Steel?
Achievable tolerances for 347 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.