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Suitable Material for Taper Shank (DIN 69871 or 69893) with Mill (indexable inserts)

Suitable Material for Taper Shank (DIN 69871 or 69893) with Mill (indexable inserts)

Suitable Material for Taper Shank (DIN 69871 or 69893) with Mill (indexable inserts)

(OP)
Dear Forum Team
I made a research about toolholders, specially taper shank's, and the material used for this are Case Hardening Materials, like 8620, 4320, or others, not case hardened, like H13.
My question is: what material is better for a combined taper shank, like DIN 69871 or 69893, with a helical/flute mill with indexable inserts? I know that for taper shank's is better the use of case harening steel's but on the other hand, I need the front end with a hardness of 40 HRC, hardness that the core wont achieve.
Please, can someone help me?

Matbol

RE: Suitable Material for Taper Shank (DIN 69871 or 69893) with Mill (indexable inserts)

16MnCr5/5120 and 8620 will typically have core hardness of 30-35 HRC when case hardened to 56-60 HRC. 4320 can have core hardness of 40-44 HRC together with case hardness of 56-60 HRC when oil quenched (oil temperature ~ 90-120 C) and subsequently tempered at 150-200 C.

RE: Suitable Material for Taper Shank (DIN 69871 or 69893) with Mill (indexable inserts)

(OP)
Dear TVP
Perfect your explanation, but, if I need diferent treatments on the taper shank 56 - 60 HRC, and on the front, were the indexable insert's are, something like 38 - 40 HRC, does the induction hardening reach this hardness on steel 4320?

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