VT machining offers CNC Sinker EDM for 40Cr Steel (GB/T 3077 / ~5140 / ~41Cr4 / SCr440), typically supplied Q&T. Chinese Cr steel, cheaper than 42CrMo with lower hardenability.
CNC Sinker EDM Notes for 40Cr Steel
Cavities and blind forms in 40Cr Steel are sunk with graphite or copper electrodes.
Process Data for CNC Sinker EDM 40Cr Steel
| Electrode | Graphite (roughing) / copper (fine finish) |
|---|---|
| Relative removal rate | High (vs tool steel = medium) |
| Best finish | VDI 12-18 (Ra 0.4-0.8 µm) |
Typical values for 40Cr Steel, Q&T; confirmed on the first part.
Full material data for 40Cr Steel (GB/T 3077 / ~5140 / ~41Cr4 / SCr440) is on the CNC Wire EDM 40Cr Steel page.
More on CNC Sinker EDM Steel
Finishing options, quality documentation and general cnc sinker edm guidance for all steel grades are on our CNC Sinker EDM Steel page.
No drawing yet? Sketch the part in our free 3D + 2D builder and send it with your RFQ.
Quoting CNC Sinker EDM 40Cr Steel
Send a STEP/IGES model or PDF drawing, confirm 40Cr Steel and its condition (we usually see it supplied Q&T), the quantity, critical tolerances and any finish or certificate requirements.
40Cr Steel in Other Processes
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Send the drawing, the 40Cr 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 Sinker EDM 40Cr Steel?
Achievable tolerances for 40Cr Steel EDM machining depend on the alloy, geometry and feature size. EDM holds tolerances to around ±0.002 mm with no cutting force on the part. Exact figures are confirmed against your drawing callouts.
Can you EDM-machine hardened 40Cr Steel?
Yes. EDM removes material by electrical discharge rather than cutting force, so hardened and difficult 40Cr Steel can be machined to fine detail and tight tolerance without distortion.
Can VT machining make custom 40Cr Steel parts to my drawing?
Yes. 40Cr Steel EDM 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 Sinker EDM 40Cr Steel require dedicated tooling?
Wire EDM needs no shaped tooling; sinker EDM uses a shaped electrode we produce in-house for your cavity.