What's new
What's new

Machinability of B7 Alloy Steel?


Cast Iron
Sep 23, 2022
Hello everyone.

Anybody have any tips and tricks for machining B7 Alloy Steel?

We don't do much of this type of material and it's kind of got me caught off guard. I am getting good results with S100 F.006 with a CNMG 431 (I had 432 but it was causing a bit too much radial force and chatter since my stickout is about 3.5x diamter). The insert grade I am using is US735

I only have 100 parts to make so it's not a big deal but I'm just curious.

From my research, this material is similar to 4140 which I usually machine at S600 but this gave very poor tool life.