CBN inserts grade turning high hardness steel after heat treating

High hardness steel

1.Hardened bearing steel

2.Carburizing steel

3.Tool steel after heat treatment

4.High temperature alloy

5.Powder metallurgy

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Halnn superhard CBN insert used for machining high hardness steel parts

When turning high hardness alloy steel, because it will have high hardness, it will produce a large turning quantity heat, have a big cutting force; and will cause hard turning inserts wear rapidly, or the insert tips chipping. Halnn superhard will give you some advice on the cutting parameter with the experience of turning high hardness alloy steel.
The insert material grade and characteristic of Halnn superhard insert turn high hardness alloy steel

BN-S20 CBN insert: Rough machining and finish turning high hardness alloy steel with HRC45~HRC79,such as: High hardness W18Cr4V high-speed steel after heat treatment, Cr12MoV die steel,GCr15 ball bearing steel,9SiCr tool steel,20Cr,15CrMo,65Mn alloy steel material. It also can rough the casting wear-resistance alloy ZGMn13,can repair high hardness alloy steel with large allowance roughing, can stand with the strong interrupted turning. It is one of most popular superhard insert.

BN-H20 CBN insert: suit for finish turning high hardness alloy steel with HRC45~HRC68 hardness with high speed, such as: hard turning the 40CrMo,20CrMnTi gear after heat treatment;BN-H20 use the Ceramic bond, has a higher thermal conductivity. suit for high hardness alloy steel workpiece after heat treatment, such as: high-speed finishing hardened steel, nitriding steel, carburizing steel ,etc. case as following:

Cutting parameter of Halnn superhard CBN insert machine high hardness alloy steel

Processing material	Cutting parameter and CBN insert grade
	Cutting linear speed Vc(m/min)	Cut depth ap(mm)	Feed rate(mm/r)	CBN insert grade
High hardness steels(hardness≥HRC45)	35-90(rough)	1-10	0.15-0.7	BN-S20
	60-120(finish)	≤1	0.05-0.35	BN-S20 or BN-H20
Super alloy (hardness≥HRC35)	200-500(rough)	1-10	0.2-1	BN-S20
	500-1500(finish)	≤1	0.05-0.3	BN-S20 or BN-H20

High hardness alloy steel include the hardened steel, heat-resistant alloy, such as: alloy steel 3Cr2Mo,4Cr5mOv1Si which widely used for mould material, the hardness was usually was between HRC45 to HRC68,some Nitride steel was above HRC65.

When machining this high hardness alloy steel, we usually use BN-H20 grade insert

when the machine work piece which allowance is more than 0.5mm, BN-S20 CBN insert will be better.

More information ,please check http://www.halnntools.com/news/know/150.html, Or contact with us halnntools@gmail.com ,skype:cbn_inserts_angels