VT machining offers CNC Milling for 1215 Steel (UNS G12150 / 11SMn30), typically supplied cold-drawn. Lead-free free-machining steel for high-speed screw machines.
CNC Milling Notes for 1215 Steel
1215 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 1215 Steel weighs about 0.79 kg.
Starting Parameters for CNC Milling 1215 Steel
| Cutting speed (carbide) | 270-475 m/min |
|---|---|
| Feed per tooth | 0.035-0.123 mm |
| Spindle speed, Ø10 mm end mill | 8590-15120 rpm |
| Insert / tool class | ISO P — CVD-coated carbide |
| Coolant | Emulsion (5-8%); dry is possible for interrupted cuts |
| Thermal growth, 100 mm part, +10 °C | 11.7 µm (CTE 11.7 µm/m·K) |
Starting values for 1215 Steel, Cold-drawn; optimised on the first article.
1215 Steel Data Relevant to CNC Milling
| Equivalent designations | UNS G12150 / 11SMn30 |
|---|---|
| Key composition | C ≤0.09%, S 0.26-0.35%, P |
| Typical supply condition | Cold-drawn |
| Hardness (typical) | ~80 HRB |
| Machinability rating | 136% (AISI B1112 = 100%) |
Typical values; we work to your drawing and mill certificate.
How 1215 Steel Differs
Lead-free free-machining steel for high-speed screw machines.
Typical applications: Screw-machine parts, fittings, couplings.
1215 Steel vs Similar Grades
| 1215 Steel | 1144 Steel | 12L14 Steel | 1117 Steel | |
|---|---|---|---|---|
| Key composition | C ≤0.09%, S 0.26-0.35%, P | C 0.40-0.48%, Mn 1.35-1.65%, S 0.24-0.33% | C ≤0.15%, S 0.26-0.35%, Pb 0.15-0.35% | C 0.14-0.20%, S 0.08-0.13% |
| Hardness | ~80 HRB | ~25-30 HRC | ~80 HRB | ~80 HRB |
| Tensile (MPa) | ~540 | ~700-800 | ~540 | ~470 |
| Machinability % | 136 | 76 | 160 | 91 |
| Typical use | Screw-machine parts, fittings, couplings | Shafts, hydraulic rods, studs | High-volume turned parts, hydraulic fittings | Case-hardened pins, shafts, studs |
More on CNC Milling Steel
Finishing options, quality documentation and general cnc milling guidance for all steel grades are on our CNC Milling Steel page.
No drawing yet? Sketch the part in our free 3D + 2D builder and send it with your RFQ.
Quoting CNC Milling 1215 Steel
Send a STEP/IGES model or PDF drawing, confirm 1215 Steel and its condition (we usually see it supplied cold-drawn), the quantity, critical tolerances and any finish or certificate requirements.
1215 Steel in Other Processes
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Send the drawing, the 1215 Steel condition and the quantity — pricing and lead time come back the same or next business day.
Request a QuoteFrequently Asked Questions
Can VT machining make custom 1215 Steel parts to my drawing?
Yes. 1215 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.
What tolerances can you hold for CNC Milling 1215 Steel?
Achievable tolerances for 1215 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 the typical lead time and minimum order for CNC Milling 1215 Steel?
CNC Milling prototypes for 1215 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 1215 Steel a good choice for CNC Milling?
1215 Steel is strong, economical and widely available, which makes it well suited to CNC Milling. We tune the process to the alloy so the finished 1215 Steel machining part meets your dimensional and functional requirements.
What is CNC Milling 1215 Steel and how is it done?
CNC Milling 1215 Steel refers to multi-axis milling cutters remove material to produce prismatic features, pockets, slots and contoured 3D surfaces. Applied to 1215 Steel — strong, economical and widely available — VT machining produces each part to your CAD drawing, selecting parameters from your tolerance, finish and quantity requirements.