Workpiece material / Tool steel

1.2767 Tool Steel (45NiCrMo16) speeds and feeds

Starting surface speeds and chip loads for milling 1.2767 Tool Steel (45NiCrMo16). Every value below is cross-checked against published sources and linked, so you can re-verify it yourself. Starting points, not limits.

Identification

W.Nr: 1.2767
DIN / EN: X45NiCrMo4
AISI / SAE: 6F7 (modified)
Brands: 45NiCrMo16, SNCM439-like
Hardness: 230-260 HB
Condition: Soft-annealed (about 230-260 HB) - the state 1.2767 is machined in before hardening.
ISO 513 group: P

Cutting data / sourcedClick any source to check

Value	Used	Provider readings (each linked)
Surface speed, HSS (estimated)	45 SFM	45 Machining Doctor - 4140 low-alloy steel data sheet (Cr-Mo class anchor) - HSS end milling, low-alloy Cr-Mo class (4140 anchor); single source, treat as a starting point
Surface speed, carbide (estimated)	250 SFM	460 Machining Doctor - 4140 low-alloy steel data sheet (Cr-Mo class anchor) - 1.2767 not separately tabulated; a Ni-Cr-Mo cold-work steel, anchored to the low-alloy 4140 class (indexable milling 460-620 SFM). Solid end mills run slower, so the shipped 250 SFM is a conservative solid-tool starting point.
Chip load @ 0.25" (estimated)	0.0012 in/tooth	0.0012 Machining Doctor - 4140 low-alloy steel data sheet (Cr-Mo class anchor) - class-typical low-alloy steel at a 1/4 in end mill; not grade-specific

Chip load by end-mill diameter in/tooth

0.125"	0.25"	0.5"
0.0006	0.0012	0.0024

Cutting-power model class-typical

Constant	Value	Readings
Kc1.1 (specific cutting force) (estimated)	1,850 N/mm2	1,850 Sandvik Coromant - specific cutting force (Kc) by ISO material group - ISO P low-alloy tool-steel group-typical Kc1.1; not tuned to this grade
mc (chip-thickness exponent) (estimated)	0.24	ISO P group-typical - see notes
Unit power (estimated)	1.45 HP/(in3/min)	ISO P group-typical - see notes

The power-model constants (Kc1.1, mc, unit power) are class-typical values for the ISO P group, used only for a rough spindle-power estimate. Only their relative ordering and internal consistency are verified, never tuned to match any vendor.

Notes

1.2767 (45NiCrMo16 / X45NiCrMo4) is a nickel-chromium-molybdenum cold-work and die steel, tough and deep-hardening, machined soft-annealed (about 230-260 HB). Grade identification is from Fushun Special Steel. Grade-specific published milling speeds are scarce, so cutting parameters are anchored to the low-alloy Cr-Mo 4140 class (indexable milling 460-620 SFM) and shipped as conservative solid-tool starting points, all flagged estimated. The power-model constants are ISO P low-alloy class-typical values for a rough power estimate only. Verify against your tool maker or shop data.

Verify this yourself

Every number above links to the provider that publishes it. Open two or more and confirm they agree with what is shown here. Full source list:

Take these into the feeds and speeds calculator for RPM, feed and power. Start a little under these numbers on a light or flexible setup.