VT machining offers CNC Milling for 8620 Alloy Steel (UNS G86200 / 20NiCrMo2-2 / SNCM220), typically supplied annealed, then carburised. Carburising steel: tough core with hard case.
CNC Milling Notes for 8620 Alloy Steel
8620 Alloy 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 8620 Alloy Steel weighs about 0.79 kg.
Starting Parameters for CNC Milling 8620 Alloy Steel
| Cutting speed (carbide) | 135-225 m/min |
|---|---|
| Feed per tooth | 0.035-0.105 mm |
| Spindle speed, Ø10 mm end mill | 4300-7160 rpm |
| Insert / tool class | ISO P — CVD-coated carbide |
| Coolant | Emulsion (6-8%) |
| Thermal growth, 100 mm part, +10 °C | 12.3 µm (CTE 12.3 µm/m·K) |
Starting values for 8620 Alloy Steel, Annealed, then carburised; optimised on the first article.
8620 Alloy Steel Data Relevant to CNC Milling
| Equivalent designations | UNS G86200 / 20NiCrMo2-2 / SNCM220 |
|---|---|
| Key composition | C 0.18-0.23%, Ni 0.4-0.7%, Cr 0.4-0.6%, Mo |
| Typical supply condition | Annealed, then carburised |
| Hardness (typical) | ~150-180 HB core; ~58-62 HRC case |
| Machinability rating | 66% (AISI B1112 = 100%) |
Typical values; we work to your drawing and mill certificate.
How 8620 Alloy Steel Differs
Carburising steel: tough core with hard case.
Typical applications: Gears, pinions, camshafts.
8620 Alloy Steel vs Similar Grades
| 8620 Alloy Steel | 4340 Alloy Steel | 9310 Alloy Steel | 4142 Alloy Steel | |
|---|---|---|---|---|
| Key composition | C 0.18-0.23%, Ni 0.4-0.7%, Cr 0.4-0.6%, Mo | C 0.38-0.43%, Ni 1.65-2%, Cr 0.7-0.9%, Mo | C 0.08-0.13%, Ni 3-3.5%, Cr 1-1.4% | C 0.40-0.45%, Cr 0.8-1.1%, Mo 0.15-0.25% |
| Hardness | ~150-180 HB core; ~58-62 HRC case | ~30-50 HRC Q&T | ~60 HRC case | ~28-32 HRC |
| Tensile (MPa) | ~530-650 | ~745 annealed; up to ~1800 | ~820 core | ~965 |
| Machinability % | 66 | 57 | 51 | 62 |
| Typical use | Gears, pinions, camshafts | Aircraft landing gear, crankshafts, heavy shafts | Helicopter and aircraft gears | Die holders, shafts, tooling |
More on CNC Milling Alloy Steel
Finishing options, quality documentation and general cnc milling guidance for all alloy steel grades are on our CNC Milling Alloy Steel page.
No drawing yet? Sketch the part in our free 3D + 2D builder and send it with your RFQ.
Quoting CNC Milling 8620 Alloy Steel
Send a STEP/IGES model or PDF drawing, confirm 8620 Alloy Steel and its condition (we usually see it supplied annealed, then carburised), the quantity, critical tolerances and any finish or certificate requirements.
8620 Alloy Steel in Other Processes
Related
Send the drawing, the 8620 Alloy Steel condition and the quantity — pricing and lead time come back the same or next business day.
Request a QuoteFrequently Asked Questions
Does CNC Milling 8620 Alloy Steel require dedicated tooling?
Most 8620 Alloy Steel machining work uses standard cutting tools and CNC programs; dedicated fixtures are made only when geometry or volume requires them.
Why is 8620 Alloy Steel a good choice for CNC Milling?
8620 Alloy Steel is high-strength and hardenable, which makes it well suited to CNC Milling. We tune the process to the alloy so the finished 8620 Alloy Steel machining part meets your dimensional and functional requirements.
Which industries use CNC Milling 8620 Alloy Steel parts?
CNC Milling 8620 Alloy Steel parts are used across aerospace, medical, automotive, electronics, semiconductor and general industrial sectors — anywhere precise 8620 Alloy Steel components are required.
What is the typical lead time and minimum order for CNC Milling 8620 Alloy Steel?
CNC Milling prototypes for 8620 Alloy 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.