VT machining offers CNC Turning for 431 Stainless Steel (UNS S43100 / 1.4057), typically supplied hardened & tempered. Best corrosion resistance of the martensitic grades with high toughness.
CNC Turning Notes for 431 Stainless Steel
On the lathe 431 Stainless Steel needs chip-breaker inserts and constant chip load to avoid long, stringy swarf.
For estimating, a 100 × 100 × 10 mm block of 431 Stainless Steel weighs about 0.77 kg.
Starting Parameters for CNC Turning 431 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 H — CBN or fine-grain carbide |
| Coolant | Flood emulsion (8-10%) or high-pressure coolant |
Starting values for 431 Stainless Steel, Hardened & tempered; optimised on the first article.
431 Stainless Steel Data Relevant to CNC Turning
| Equivalent designations | UNS S43100 / 1.4057 |
|---|---|
| Key composition | Cr 15-17%, Ni 1.25-2.5% |
| Typical supply condition | Hardened & tempered |
| Hardness (typical) | ~25-40 HRC |
| Machinability rating | 45% (AISI B1112 = 100%) |
Typical values; we work to your drawing and mill certificate.
How 431 Stainless Steel Differs
Best corrosion resistance of the martensitic grades with high toughness.
Typical applications: Pump shafts, marine fittings, aircraft fasteners.
431 Stainless Steel vs Similar Grades
| 431 Stainless Steel | 430 Stainless Steel | 440C Stainless Steel | 420 Stainless Steel | |
|---|---|---|---|---|
| Key composition | Cr 15-17%, Ni 1.25-2.5% | Cr 16-18% | Cr 16-18%, C 0.95-1.2% | Cr 12-14%, C 0.15-0.4% |
| Hardness | ~25-40 HRC | ≤88 HRB | Up to ~58-60 HRC | Up to ~50 HRC |
| Tensile (MPa) | ~860 (H&T) | ≥450 | ≥760 annealed | ≥655 annealed |
| Machinability % | 45 | 54 | 40 | 45 |
| Typical use | Pump shafts, marine fittings, aircraft fasteners | Appliance panels, trim, magnetic parts | Bearings, valve seats, nozzles, knives | Surgical instruments, molds, knife blades |
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 431 Stainless Steel
Send a STEP/IGES model or PDF drawing, confirm 431 Stainless Steel and its condition (we usually see it supplied hardened & tempered), the quantity, critical tolerances and any finish or certificate requirements.
431 Stainless Steel in Other Processes
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Send the drawing, the 431 Stainless Steel condition and the quantity — pricing and lead time come back the same or next business day.
Request a QuoteFrequently Asked Questions
What material thickness or size range suits CNC Turning 431 Stainless Steel?
Turned 431 Stainless Steel parts are produced from bar or chuck stock across a wide diameter range.
Which industries use CNC Turning 431 Stainless Steel parts?
CNC Turning 431 Stainless Steel parts are used across aerospace, medical, automotive, electronics, semiconductor and general industrial sectors — anywhere precise 431 Stainless Steel components are required.
What tolerances can you hold for CNC Turning 431 Stainless Steel?
Achievable tolerances for 431 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.
What is CNC Turning 431 Stainless Steel and how is it done?
CNC Turning 431 Stainless Steel refers to cNC turning rotates the workpiece against a single-point tool to produce cylindrical features, threads and grooves. Applied to 431 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.