Sandvik Coromant Parting and grooving - users guide - Manual (Page 49)

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Heat resistant super alloys (HRSA)
HRSA falls into three groups: nickel-based, iron-based and cobalt-based alloys. The physical
properties and machining behaviour of each group varies considerably. Whether the metal
is annealed or aged is particularly influential on the subsequent machining properties as the
hardness varies from 150 to 440 HB.
The machinability of HRSA is generally poor compared to both general steels and stainless
steels.
In this material we recommend to use CoroCut 1- and 2-edged inserts with PVD coating like
GC1105 for medium finishing machining and MTCVD grade S05F for roughing.
For higher cutting speed ceramic inserts in grade CC670 for finishing in the 150.23 system
will improve the productivity.
Recommended grades and cutting data
First stage machining (Roughing)
Starting grade S05F. Cutting speed 60 m/min and feed 0.10 mm/r.
Intermediate stage machining (Medium)
Starting grade GC1105. Cutting speed 50 m/min and feed 0.10 mm/r.
Last stage machining (Finishing)
Starting grade GC1105. Cutting speed 50 m/min and feed 0.10 mm/r.
Starting grade CC670. Cutting speed 300 m/min and feed 0.10 mm/r.
Titanium alloys
Titanium alloys are typically machined in the annealed or solution treated and aged condi-
tion, when hardness can vary between 300-440 HB. The machinability is also poor compared
to both general steels and stainless steels, which imposes particular demands on the cutting
tools.
For good results in these materials we recommend to use CoroCut 1- and 2-edge inserts with
a sharp edge e.g. in uncoated grade H13A.
Recommended grade and cutting data
Starting grade H13A. Geometries TF/GF/RO.
Cutting speed 60 m/min and feed 0.15 mm/r.
HRSA and titanium grooving