VT machining offers CNC Milling for Q235 Steel (GB/T 700 / ~S235JR / ~A36), typically supplied hot-rolled. Chinese standard structural steel, yield ≥235 MPa.
CNC Milling Notes for Q235 Steel
Q235 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 Q235 Steel weighs about 0.79 kg.
Starting Parameters for CNC Milling Q235 Steel
| Cutting speed (carbide) | 170-300 m/min |
|---|---|
| Feed per tooth | 0.035-0.123 mm |
| Spindle speed, Ø10 mm end mill | 5410-9550 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 Q235 Steel, Hot-rolled; optimised on the first article.
Q235 Steel Data Relevant to CNC Milling
| Equivalent designations | GB/T 700 / ~S235JR / ~A36 |
|---|---|
| Key composition | C ≤0.22%, Mn ≤1.4% |
| Typical supply condition | Hot-rolled |
| Hardness (typical) | ~120 HB |
| Machinability rating | 70% (AISI B1112 = 100%) |
Typical values; we work to your drawing and mill certificate.
How Q235 Steel Differs
Chinese standard structural steel, yield ≥235 MPa.
Typical applications: Frames, plates, general fabrications.
Q235 Steel vs Similar Grades
| Q235 Steel | S355JR Steel | Q345 Steel | S275JR Steel | |
|---|---|---|---|---|
| Key composition | C ≤0.22%, Mn ≤1.4% | C ≤0.24%, Mn ≤1.6% | C ≤0.20%, Mn ≤1.7% | C ≤0.21%, Mn ≤1.5% |
| Hardness | ~120 HB | ~150 HB | ~150 HB | ~130 HB |
| Tensile (MPa) | 370-500 | 470-630 | 470-630 | 410-560 |
| Machinability % | 70 | 65 | 65 | 70 |
| Typical use | Frames, plates, general fabrications | Machine frames, heavy brackets, cranes | Bridges, machine bases, pressure parts | Structural sections, base plates |
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 Q235 Steel
Send a STEP/IGES model or PDF drawing, confirm Q235 Steel and its condition (we usually see it supplied hot-rolled), the quantity, critical tolerances and any finish or certificate requirements.
Q235 Steel in Other Processes
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Send the drawing, the Q235 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 Q235 Steel with CNC Milling?
Surface finish on Q235 Steel is controlled to your specification; we confirm the achievable Ra against your callout.
Does CNC Milling Q235 Steel require dedicated tooling?
Most Q235 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 Q235 Steel parts?
CNC Milling Q235 Steel parts are used across aerospace, medical, automotive, electronics, semiconductor and general industrial sectors — anywhere precise Q235 Steel components are required.
What tolerances can you hold for CNC Milling Q235 Steel?
Achievable tolerances for Q235 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.