VT machining offers CNC Turning for S355JR Steel (EN 10025 / 1.0045 / ~Q345B), typically supplied hot-rolled. Higher-strength structural steel, yield ≥355 MPa.
CNC Turning Notes for S355JR Steel
S355JR Steel turns with good chip control at standard cutting data.
For estimating, a 100 × 100 × 10 mm block of S355JR Steel weighs about 0.79 kg.
Starting Parameters for CNC Turning S355JR Steel
| Cutting speed (carbide) | 185-325 m/min |
|---|---|
| Feed | 0.1-0.35 mm/rev |
| Spindle speed, Ø25 mm bar | 2360-4140 rpm |
| Insert / tool class | ISO P — CVD-coated carbide |
| Coolant | Emulsion (5-8%); dry is possible for interrupted cuts |
Starting values for S355JR Steel, Hot-rolled; optimised on the first article.
S355JR Steel Data Relevant to CNC Turning
| Equivalent designations | EN 10025 / 1.0045 / ~Q345B |
|---|---|
| Key composition | C ≤0.24%, Mn ≤1.6% |
| Typical supply condition | Hot-rolled |
| Hardness (typical) | ~150 HB |
| Machinability rating | 65% (AISI B1112 = 100%) |
Typical values; we work to your drawing and mill certificate.
How S355JR Steel Differs
Higher-strength structural steel, yield ≥355 MPa.
Typical applications: Machine frames, heavy brackets, cranes.
S355JR Steel vs Similar Grades
| S355JR Steel | S275JR Steel | Q235 Steel | S235JR Steel | |
|---|---|---|---|---|
| Key composition | C ≤0.24%, Mn ≤1.6% | C ≤0.21%, Mn ≤1.5% | C ≤0.22%, Mn ≤1.4% | C ≤0.17-0.20%, Mn ≤1.4% |
| Hardness | ~150 HB | ~130 HB | ~120 HB | ~120 HB |
| Tensile (MPa) | 470-630 | 410-560 | 370-500 | 360-510 |
| Machinability % | 65 | 70 | 70 | 70 |
| Typical use | Machine frames, heavy brackets, cranes | Structural sections, base plates | Frames, plates, general fabrications | Frames, brackets, weldments |
More on CNC Turning Steel
Finishing options, quality documentation and general cnc turning guidance for all steel grades are on our CNC Turning Steel page.
No drawing yet? Sketch the part in our free 3D + 2D builder and send it with your RFQ.
Quoting CNC Turning S355JR Steel
Send a STEP/IGES model or PDF drawing, confirm S355JR Steel and its condition (we usually see it supplied hot-rolled), the quantity, critical tolerances and any finish or certificate requirements.
S355JR Steel in Other Processes
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Send the drawing, the S355JR Steel condition and the quantity — pricing and lead time come back the same or next business day.
Request a QuoteFrequently Asked Questions
Does CNC Turning S355JR Steel require dedicated tooling?
Most S355JR Steel turning work uses standard cutting tools and CNC programs; dedicated fixtures are made only when geometry or volume requires them.
Can VT machining make custom S355JR Steel parts to my drawing?
Yes. S355JR Steel turning 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 material thickness or size range suits CNC Turning S355JR Steel?
Turned S355JR Steel parts are produced from bar or chuck stock across a wide diameter range.
Why is S355JR Steel a good choice for CNC Turning?
S355JR Steel is strong, economical and widely available, which makes it well suited to CNC Turning. We tune the process to the alloy so the finished S355JR Steel turning part meets your dimensional and functional requirements.
What is the typical lead time and minimum order for CNC Turning S355JR Steel?
CNC Turning prototypes for S355JR 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.
What is CNC Turning S355JR Steel and how is it done?
CNC Turning S355JR Steel refers to cNC turning rotates the workpiece against a single-point tool to produce cylindrical features, threads and grooves. Applied to S355JR Steel — strong, economical and widely available — VT machining produces each part to your CAD drawing, selecting parameters from your tolerance, finish and quantity requirements.