Starting cutting speed in m/min and sfm, feed in mm/rev and ipr, the carbide grade class and the setup by operation for S275JR (W.-Nr. 1.0044). The numbers are the published P01 Low carbon steel sub-group starting band; the designations are on the cross-reference page.
| Item | Value |
|---|---|
| ISO 513 group | P Steel |
| Sub-group | P01 Low carbon steel |
| Sub-group hardness / condition | 125–180 HB |
| Category | Structural steel |
| EN / Werkstoffnummer | S275JR · 1.0044 |
Hardness is the range published for the whole P01 Low carbon steel sub-group on our material guide; the delivery condition of your S275JR may sit anywhere inside it or outside it.
At least one designation of this material is a nearest commonly-cited counterpart, not a same-composition equivalent. The machining values below belong to the sub-group, so confirm the actual alloy and delivery condition on the material certificate.
| Condition | Vc m/min | Vc sfm | Feed mm/rev | Feed ipr |
|---|---|---|---|---|
| P01 Low carbon steel, 125–180 HB | 150–300 | 490–985 | 0.10–0.40 | .004–.016 |
Sub-group starting values for carbide inserts, from P01 Low carbon steel. They describe the whole sub-group and are not tuned to S275JR. sfm and ipr are converted from the metric values (1 m/min = 3.281 sfm, 25.4 mm = 1 in). The published band is per sub-group, not per operation; the table below gives the setup by operation. Convert Vc to spindle speed with the speeds & feeds calculator, and see the speeds & feeds guide for the ISO P group range.
| Operation | Geometry | Coating family | Coolant | First check |
|---|---|---|---|---|
| Roughing | Positive, sharp edge with a chipbreaker sized for soft, stringy chips | Coated carbide | Add coolant against built-up edge | Long stringy chips: increase fn or use a roughing breaker |
| Finishing | Positive, sharp edge, medium chipbreaker | Coated carbide | Add coolant against built-up edge | Built-up edge: raise Vc, sharper edge |
| Interrupted cut | Positive edge with a robust chipbreaker | Coated carbide | Add coolant as needed | Smearing at low speed: keep speed in band |
| Low rigidity / thin wall | Positive, sharp edge | Coated carbide | Add coolant as needed | Poor finish from built-up edge |
Setup rows are the selection table of the P01 Low carbon steel guide. They carry no speeds, so they do not change the starting band above.
Same sub-group, same starting band: AISI 1015 · S235JR · S355J2 · C22
Coated carbide, P10–P25. A sharp positive geometry and a medium chipbreaker fight built-up edge and stringy chips.
The P, M, K, N, S or H number inside a grade range describes what the grade is built for, not the workpiece sub-group number, and the two scales must not be matched to each other. We name no single grade here: none of our published sources ties a named grade to this alloy. Pick by ISO class, then compare what the makers publish on the ISO P grade list and in the grade chart.
EN S275JR, Werkstoffnummer 1.0044, US ASTM A529 Gr. 50 (nearest), JIS SS400 (nearest). The full table, with the nearest-match flags, is on the S275JR / A529 Gr. 50 cross-reference page.
Structural grades match across standards by properties, not chemistry. In the cut it behaves like S235 with a little more strength: standard low-carbon P-group treatment.
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The published starting band for the P01 Low carbon steel sub-group is 150–300 m/min (490–985 sfm) at 0.10–0.40 mm/rev (.004–.016 ipr). It is a starting band for the whole sub-group, not a value tuned to S275JR, so confirm on a sample part and adjust for condition, tool and rigidity.
Coated carbide, P10–P25. A sharp positive geometry and a medium chipbreaker fight built-up edge and stringy chips. Pick the grade by ISO class rather than by brand name, then confirm the exact grade for your condition. We name no single grade here because none of our published sources ties a named grade to this alloy.
EN S275JR (Werkstoffnummer 1.0044); US: ASTM A529 Gr. 50 (nearest); JIS: SS400 (nearest). At least one pairing is nearest-by-properties, not a drop-in equivalent: the material certificate decides.
The advisor compares what the makers publish for your material and operation and shows the source behind each answer, or tells you it could not verify.