VT machining offers CNC Cylindrical Grinding for 40Cr Steel (GB/T 3077 / ~5140 / ~41Cr4 / SCr440), typically supplied Q&T. Chinese Cr steel, cheaper than 42CrMo with lower hardenability.
CNC Cylindrical Grinding Notes for 40Cr Steel
40Cr Steel is ground with aluminium-oxide or CBN wheels chosen for its hardness (~28-32 HRC).
Process Data for CNC Cylindrical Grinding 40Cr Steel
| Wheel (supply condition) | Aluminium oxide, medium grade |
|---|---|
| Depth per pass (rough / finish) | 0.01-0.03 / 0.002-0.005 mm |
| Achievable finish | Ra 0.2-0.4 µm |
| Typical size tolerance | Ø ±0.002 mm, roundness 0.001-0.002 mm |
| Diameter growth, Ø50 mm, +3 °C | 1.8 µm |
| Work speed | 15-30 m/min (between centres) |
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 Surface Grinding 40Cr Steel page.
More on CNC Cylindrical Grinding Steel
Finishing options, quality documentation and general cnc cylindrical grinding guidance for all steel grades are on our CNC Cylindrical Grinding Steel page.
No drawing yet? Sketch the part in our free 3D + 2D builder and send it with your RFQ.
Quoting CNC Cylindrical Grinding 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 surface finish is achievable on 40Cr Steel with CNC Cylindrical Grinding?
Grinding can take 40Cr Steel to a fine finish — typically Ra 0.1–0.4 µm, and to a mirror grade on suitable alloys.
What is the typical lead time and minimum order for CNC Cylindrical Grinding 40Cr Steel?
CNC Cylindrical Grinding prototypes for 40Cr 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.
Why is 40Cr Steel a good choice for CNC Cylindrical Grinding?
40Cr Steel is strong, economical and widely available, which makes it well suited to CNC Cylindrical Grinding. We tune the process to the alloy so the finished 40Cr Steel grinding part meets your dimensional and functional requirements.
What tolerances can you hold for CNC Cylindrical Grinding 40Cr Steel?
Achievable tolerances for 40Cr Steel grinding depend on the alloy, geometry and feature size. Grinding routinely holds single-micron tolerances on diameter, flatness and parallelism. Exact figures are confirmed against your drawing callouts.
What is CNC Cylindrical Grinding 40Cr Steel and how is it done?
CNC Cylindrical Grinding 40Cr Steel refers to cylindrical grinding finishes outer diameters of rotational parts to precise size and roundness. Applied to 40Cr Steel — strong, economical and widely available — VT machining produces each part to your CAD drawing, selecting parameters from your tolerance, finish and quantity requirements.
Can VT machining make custom 40Cr Steel parts to my drawing?
Yes. 40Cr Steel grinding 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.