VT machining offers CNC Milling for 17-4 PH Stainless Steel (UNS S17400 / 1.4542 / SUS630), typically supplied condition A or H900-H1150. Can be finish-machined in Condition A then aged with minimal distortion.
CNC Milling Notes for 17-4 PH Stainless Steel
17-4 PH 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 17-4 PH Stainless Steel weighs about 0.78 kg.
Starting Parameters for CNC Milling 17-4 PH Stainless Steel
| Cutting speed (carbide) | 110-200 m/min |
|---|---|
| Feed per tooth | 0.028-0.088 mm |
| Spindle speed, Ø10 mm end mill | 3500-6370 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 | 10.8 µm (CTE 10.8 µm/m·K) |
Starting values for 17-4 PH Stainless Steel, Condition A or H900-H1150; optimised on the first article.
17-4 PH Stainless Steel Data Relevant to CNC Milling
| Equivalent designations | UNS S17400 / 1.4542 / SUS630 |
|---|---|
| Key composition | Cr 15-17.5%, Ni 3-5%, Cu 3-5%, Nb |
| Typical supply condition | Condition A or H900-H1150 |
| Hardness (typical) | ~28-44 HRC by condition |
| Machinability rating | 48% (AISI B1112 = 100%) |
Typical values; we work to your drawing and mill certificate.
How 17-4 PH Stainless Steel Differs
Can be finish-machined in Condition A then aged with minimal distortion.
Typical applications: Aerospace, oil & gas, medical instruments.
17-4 PH Stainless Steel vs Similar Grades
| 17-4 PH Stainless Steel | 904L Stainless Steel | 440C Stainless Steel | 431 Stainless Steel | |
|---|---|---|---|---|
| Key composition | Cr 15-17.5%, Ni 3-5%, Cu 3-5%, Nb | Cr 19-23%, Ni 23-28%, Mo 4-5%, Cu 1-2% | Cr 16-18%, C 0.95-1.2% | Cr 15-17%, Ni 1.25-2.5% |
| Hardness | ~28-44 HRC by condition | ≤90 HRB | Up to ~58-60 HRC | ~25-40 HRC |
| Tensile (MPa) | 930-1310 | ≥490 | ≥760 annealed | ~860 (H&T) |
| Machinability % | 48 | 30 | 40 | 45 |
| Typical use | Aerospace, oil & gas, medical instruments | Acid handling, heat exchangers, watch cases | Bearings, valve seats, nozzles, knives | Pump shafts, marine fittings, aircraft fasteners |
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 17-4 PH Stainless Steel
Send a STEP/IGES model or PDF drawing, confirm 17-4 PH Stainless Steel and its condition (we usually see it supplied condition A or H900-H1150), the quantity, critical tolerances and any finish or certificate requirements.
17-4 PH Stainless Steel in Other Processes
Related
Send the drawing, the 17-4 PH Stainless Steel condition and the quantity — pricing and lead time come back the same or next business day.
Request a QuoteFrequently Asked Questions
Which industries use CNC Milling 17-4 PH Stainless Steel parts?
CNC Milling 17-4 PH Stainless Steel parts are used across aerospace, medical, automotive, electronics, semiconductor and general industrial sectors — anywhere precise 17-4 PH Stainless Steel components are required.
What surface finish is achievable on 17-4 PH Stainless Steel with CNC Milling?
Surface finish on 17-4 PH Stainless Steel is controlled to your specification; we confirm the achievable Ra against your callout.
Can VT machining make custom 17-4 PH Stainless Steel parts to my drawing?
Yes. 17-4 PH 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.
Does CNC Milling 17-4 PH Stainless Steel require dedicated tooling?
Most 17-4 PH Stainless Steel machining work uses standard cutting tools and CNC programs; dedicated fixtures are made only when geometry or volume requires them.
What tolerances can you hold for CNC Milling 17-4 PH Stainless Steel?
Achievable tolerances for 17-4 PH 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 CNC Milling 17-4 PH Stainless Steel and how is it done?
CNC Milling 17-4 PH Stainless Steel refers to multi-axis milling cutters remove material to produce prismatic features, pockets, slots and contoured 3D surfaces. Applied to 17-4 PH 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.