HD2 Chip Groove — New Chipbreaker

Single-sided roughing geometry, sharp positive cutting edges, for steels with high strength (800 N/mm²).

Example: CNMM 120408-HD2. Depth of cut 1.50–12.00 mm, feed 0.50–0.90 mm.

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Designation	Chipbreaker	Material No.	Available
CNMM 120408-HD2 GTCP115	…-HD2	MM12041787	●
DNMM 150608-HD2 GTCP115	…-HD2	MM12055337	●

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Designation	Chipbreaker	Material No.	Available
CNMM 120408-HD2 GTCP125	…-HD2	MM12041513	●
CNMM 120412-HD2 GTCP125	…-HD2	MM12077416	●
DNMM 150608-HD2 GTCP125	…-HD2	MM12055332	●

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Designation	Chipbreaker	Material No.	Available
CNMM 120408-HD2 GTCP135	…-HD2	MM12041518	●
DNMM 150608-HD2 GTCP135	…-HD2	MM12055326	●

Cutting data — general cutting parameters by workpiece material

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Group	Type / alloy	Hardness HB	GTCP115 vc	GTCP125 vc	GTCP135 vc
P	Non-alloyed steel 0–0.45% C	150–250	220–400	170–240	170–190
P	Low-alloyed steel	250–300	200–320	100–190	90–150
P	High-alloyed steel	200	180–320	130–210	120–200
P	Corrosion-resistant steel	200	200–320	130–210	140–180
M	Ferritic stainless	200	220–320	140–210	140–200
M	Austenitic stainless	180	–	100–210	110–190
M	Duplex stainless	230–260	–	–	80–150
M	Martensitic stainless	330	–	70–100	55–75
K	Grey cast iron	180	140–370	130–210	–
K	Spheroidal cast iron	160	190–430	120–240	–
K	Malleable/tempered iron	130	180–520	150–250	–