VT machining offers CNC Punching for Q345 Steel (GB/T 1591 (now Q355) / ~S355JR), typically supplied hot-rolled. Chinese low-alloy high-strength steel; replaced by Q355 in GB/T 1591-2018.
CNC Punching Notes for Q345 Steel
Q345 Steel punches cleanly with standard clearance; minimum hole diameter is about the sheet thickness.
For estimating, a 100 × 100 × 10 mm block of Q345 Steel weighs about 0.79 kg.
Process Data for CNC Punching Q345 Steel
| Die clearance per side | 7.5% of thickness (0.15 mm at 2 mm) |
|---|---|
| Punch force, Ø10 hole in 2 mm | ~27.6 kN (2.8 t) |
| Minimum hole diameter | ≥ 1 × thickness |
Typical values for Q345 Steel, Hot-rolled; confirmed on the first part.
Q345 Steel Data Relevant to CNC Punching
| Equivalent designations | GB/T 1591 (now Q355) / ~S355JR |
|---|---|
| Typical supply condition | Hot-rolled |
| Hardness (typical) | ~150 HB |
| Tensile strength | 470-630 MPa |
Typical values; we work to your drawing and mill certificate.
More on CNC Punching Steel
Finishing options, quality documentation and general cnc punching guidance for all steel grades are on our CNC Punching Steel page.
No drawing yet? Sketch the part in our free 3D + 2D builder and send it with your RFQ.
Quoting CNC Punching Q345 Steel
Send a STEP/IGES model or PDF drawing, confirm Q345 Steel and its condition (we usually see it supplied hot-rolled), the quantity, critical tolerances and any finish or certificate requirements.
Q345 Steel in Other Processes
Related
Send the drawing, the Q345 Steel condition and the quantity — pricing and lead time come back the same or next business day.
Request a QuoteFrequently Asked Questions
What tolerances can you hold for CNC Punching Q345 Steel?
Achievable tolerances for Q345 Steel punching depend on the alloy, geometry and feature size. Punching holds hole-position repeatability to around ±0.10 mm. Exact figures are confirmed against your drawing callouts.
What surface finish is achievable on Q345 Steel with CNC Punching?
Surface finish on Q345 Steel is controlled to your specification; we confirm the achievable Ra against your callout.
What is the typical lead time and minimum order for CNC Punching Q345 Steel?
CNC Punching prototypes for Q345 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 Q345 Steel a good choice for CNC Punching?
Q345 Steel is strong, economical and widely available, which makes it well suited to CNC Punching. We tune the process to the alloy so the finished Q345 Steel punching part meets your dimensional and functional requirements.
What is CNC Punching Q345 Steel and how is it done?
CNC Punching Q345 Steel refers to cNC turret punching shears holes and form features in sheet metal using programmable tooling for fast, repeatable patterns. Applied to Q345 Steel — strong, economical and widely available — VT machining produces each part to your CAD drawing, selecting parameters from your tolerance, finish and quantity requirements.