VT machining offers CNC Milling for A36 Steel (ASTM A36 / ~S275JR / Q235B), typically supplied hot-rolled. General structural plate; cheap and weldable, mill scale must be removed.
CNC Milling Notes for A36 Steel
A36 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 A36 Steel weighs about 0.79 kg.
Starting Parameters for CNC Milling A36 Steel
| Cutting speed (carbide) | 175-305 m/min |
|---|---|
| Feed per tooth | 0.035-0.123 mm |
| Spindle speed, Ø10 mm end mill | 5570-9710 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 A36 Steel, Hot-rolled; optimised on the first article.
A36 Steel Data Relevant to CNC Milling
| Equivalent designations | ASTM A36 / ~S275JR / Q235B |
|---|---|
| Key composition | C ≤0.26%, Mn ~0.8-1.2% |
| Typical supply condition | Hot-rolled |
| Hardness (typical) | ~67-83 HRB |
| Machinability rating | 72% (AISI B1112 = 100%) |
Typical values; we work to your drawing and mill certificate.
How A36 Steel Differs
General structural plate; cheap and weldable, mill scale must be removed.
Typical applications: Base plates, brackets, frames, weldments.
A36 Steel vs Similar Grades
| A36 Steel | 1008 Steel | 1010 Steel | 1018 Steel | |
|---|---|---|---|---|
| Key composition | C ≤0.26%, Mn ~0.8-1.2% | C ≤0.10% | C 0.08-0.13% | C 0.15-0.20%, Mn 0.6-0.9% |
| Hardness | ~67-83 HRB | ~50-60 HRB | ~55-65 HRB | ~71 HRB |
| Tensile (MPa) | 400-550 | ~300-340 | ~330-365 | ~440 |
| Machinability % | 72 | 55 | 55 | 78 |
| Typical use | Base plates, brackets, frames, weldments | Stampings, deep-drawn parts, panels | Formed parts, rivets, cold-headed parts | Shafts, pins, spacers, fixtures |
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 A36 Steel
Send a STEP/IGES model or PDF drawing, confirm A36 Steel and its condition (we usually see it supplied hot-rolled), the quantity, critical tolerances and any finish or certificate requirements.
A36 Steel in Other Processes
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Send the drawing, the A36 Steel condition and the quantity — pricing and lead time come back the same or next business day.
Request a QuoteFrequently Asked Questions
What is the typical lead time and minimum order for CNC Milling A36 Steel?
CNC Milling prototypes for A36 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.
Does CNC Milling A36 Steel require dedicated tooling?
Most A36 Steel machining work uses standard cutting tools and CNC programs; dedicated fixtures are made only when geometry or volume requires them.
Which industries use CNC Milling A36 Steel parts?
CNC Milling A36 Steel parts are used across aerospace, medical, automotive, electronics, semiconductor and general industrial sectors — anywhere precise A36 Steel components are required.
Why is A36 Steel a good choice for CNC Milling?
A36 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 A36 Steel machining part meets your dimensional and functional requirements.
What surface finish is achievable on A36 Steel with CNC Milling?
Surface finish on A36 Steel is controlled to your specification; we confirm the achievable Ra against your callout.