Starting cutting speed in m/min and sfm, feed in mm/rev and ipr, the carbide grade class and the setup by operation for AISI 431 (X17CrNi16-2). The numbers are the published M20 Ferritic stainless sub-group starting band; the designations are on the cross-reference page.
| Item | Value |
|---|---|
| ISO 513 group | M Stainless steel |
| Sub-group | M20 Ferritic stainless |
| Sub-group hardness / condition | 160–220 HB |
| Category | Martensitic stainless (Ni) |
| EN / Werkstoffnummer | X17CrNi16-2 · 1.4057 |
Hardness is the range published for the whole M20 Ferritic stainless sub-group on our material guide; the delivery condition of your AISI 431 may sit anywhere inside it or outside it.
| Condition | Vc m/min | Vc sfm | Feed mm/rev | Feed ipr |
|---|---|---|---|---|
| M20 Ferritic stainless, 160–220 HB | 120–200 | 395–655 | 0.10–0.30 | .004–.012 |
Sub-group starting values for carbide inserts, from M20 Ferritic stainless. They describe the whole sub-group and are not tuned to AISI 431. 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 M group range.
| Operation | Geometry | Coating family | Coolant | First check |
|---|---|---|---|---|
| Roughing | Positive, sharp, honed edge; polished chipbreaker | PVD-coated M-class carbide | Coolant on the edge | Consistent depth of cut; do not dwell |
| Finishing | Keen positive edge that shears instead of rubbing | PVD-coated M-class carbide, sharp edge | Coolant on the edge | Built-up edge or smeared finish: raise Vc, sharper edge |
| Interrupted cut | Positive honed edge, tougher edge | PVD-coated M-class carbide | Coolant on the edge | Notch wear at the DOC line: vary the depth of cut |
| Low rigidity / thin wall | Sharp positive edge; polished chipbreaker | PVD-coated M-class carbide | Coolant on the edge | Poor finish from rubbing: keep the edge sharp |
Setup rows are the selection table of the M20 Ferritic stainless guide. They carry no speeds, so they do not change the starting band above.
Same sub-group, same starting band: AISI 410 · X20Cr13 · AISI 430 · AISI 416 · AISI 440C
PVD-coated M-class carbide with a sharp positive edge.
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 M grade list and in the grade chart.
EN X17CrNi16-2, Werkstoffnummer 1.4057, US AISI 431 (UNS S43100), JIS SUS431. The full table, with the nearest-match flags, is on the AISI 431 / 1.4057 cross-reference page.
Tough shaft-grade martensitic, usually cut quenched and tempered: stringy chips and higher cutting forces than 410. Chip control geometry matters more than raw speed.
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The published starting band for the M20 Ferritic stainless sub-group is 120–200 m/min (395–655 sfm) at 0.10–0.30 mm/rev (.004–.012 ipr). It is a starting band for the whole sub-group, not a value tuned to AISI 431, so confirm on a sample part and adjust for condition, tool and rigidity.
PVD-coated M-class carbide with a sharp positive edge. 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 X17CrNi16-2 (Werkstoffnummer 1.4057); US: AISI 431 (UNS S43100); JIS: SUS431. Entries marked nearest are the closest commonly-cited counterpart, not a same-composition equivalent.
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.