Starting cutting speed in m/min and sfm, feed in mm/rev and ipr, the carbide grade class and the setup by operation for ASTM A536 60-40-18 (EN-GJS-400-15). The numbers are the published K20 Nodular / ductile iron sub-group starting band; the designations are on the cross-reference page.
| Item | Value |
|---|---|
| ISO 513 group | K Cast iron |
| Sub-group | K20 Nodular / ductile iron |
| Sub-group hardness / condition | 170–260 HB |
| Category | Ductile (nodular) iron |
| EN / Werkstoffnummer | EN-GJS-400-15 (GGG40) · EN-JS1030 |
Hardness is the range published for the whole K20 Nodular / ductile iron sub-group on our material guide; the delivery condition of your ASTM A536 60-40-18 may sit anywhere inside it or outside it.
| Condition | Vc m/min | Vc sfm | Feed mm/rev | Feed ipr |
|---|---|---|---|---|
| K20 Nodular / ductile iron, 170–260 HB | 150–300 | 490–985 | 0.10–0.40 | .004–.016 |
Sub-group starting values for carbide inserts, from K20 Nodular / ductile iron. They describe the whole sub-group and are not tuned to ASTM A536 60-40-18. 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 K group range.
| Operation | Geometry | Coating family | Coolant | First check |
|---|---|---|---|---|
| Roughing | Negative geometry, honed edge for skin and scale | CVD alumina (Al₂O₃)-coated carbide | Dry or with coolant | Abrasive flank wear: keep the speed sensible |
| Finishing | Negative geometry, clean sharp-honed edge | CVD alumina carbide | Dry or with coolant | Built-up edge at low speed: raise Vc into the band |
| Interrupted cut | Honed edge for skin, scale and interruptions | Slightly tougher CVD alumina carbide than for grey iron | Dry or with coolant | Edge chipping: tougher grade, ease into the cut |
| Low rigidity / thin wall | Negative geometry; shorten overhang and support the part | CVD alumina carbide | Dry or with coolant | Chatter is rigidity, not the grade |
Setup rows are the selection table of the K20 Nodular / ductile iron guide. They carry no speeds, so they do not change the starting band above.
Same sub-group, same starting band: EN-GJS-600-3 · EN-GJS-700-2
CVD alumina (Al₂O₃)-coated carbide, K10–K20, to resist high-temperature abrasion. Ductile iron is tougher than grey iron, so a slightly tougher edge than a grey-iron grade helps.
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 K grade list and in the grade chart.
EN-GJS-400-15 (GGG40), Werkstoffnummer EN-JS1030, US ASTM A536 60-40-18, JIS FCD400. The full table, with the nearest-match flags, is on the EN-GJS-400-15 / A536 60-40-18 cross-reference page.
Ferritic ductile iron: tougher and stringier than grey iron, closer to steel in the cut. Lower half of the K range and a tougher edge line than you would pick for GJL.
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The published starting band for the K20 Nodular / ductile iron 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 ASTM A536 60-40-18, so confirm on a sample part and adjust for condition, tool and rigidity.
CVD alumina (Al₂O₃)-coated carbide, K10–K20, to resist high-temperature abrasion. Ductile iron is tougher than grey iron, so a slightly tougher edge than a grey-iron grade helps. 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-GJS-400-15 (GGG40) (Werkstoffnummer EN-JS1030); US: ASTM A536 60-40-18; JIS: FCD400. 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.