Case hardening S2 Tool Steel?
Case hardening S2 Tool Steel?
(OP)
Hi all,
I have a lot of mandrels that we are planning on redesigning. They are subjected to high torsional impact loads and fractographic analysis shows a brittle fatigue failure. We are going to select a new material for this application, and we are aiming to have a softer core and just case harden the shaft for wear resistance. The shaft is 0.25", and ideally I would like to achieve a core hardness of 35-38 HRC with a 0.008 - 0.012" case hardened to 52-56HRC. My question is, without having to make these mandrels from a new material, would I be able to carburize S2 Tool steel to meet this hardness profile? If not what about nitriding? I don't want to have to get a large quantity of these made just for testing purposes, and I want to see if we can get away with using our existing inventory. Also, I am looking for suggestions for a future material to use for this application. I want something that will be cheaper than S2, but will also have the ability to form the hardness profile that I am looking for.
Thanks,
M
I have a lot of mandrels that we are planning on redesigning. They are subjected to high torsional impact loads and fractographic analysis shows a brittle fatigue failure. We are going to select a new material for this application, and we are aiming to have a softer core and just case harden the shaft for wear resistance. The shaft is 0.25", and ideally I would like to achieve a core hardness of 35-38 HRC with a 0.008 - 0.012" case hardened to 52-56HRC. My question is, without having to make these mandrels from a new material, would I be able to carburize S2 Tool steel to meet this hardness profile? If not what about nitriding? I don't want to have to get a large quantity of these made just for testing purposes, and I want to see if we can get away with using our existing inventory. Also, I am looking for suggestions for a future material to use for this application. I want something that will be cheaper than S2, but will also have the ability to form the hardness profile that I am looking for.
Thanks,
M





RE: Case hardening S2 Tool Steel?
rp
RE: Case hardening S2 Tool Steel?
RE: Case hardening S2 Tool Steel?
I am with RP, heat treat the S2 to 35-38 Rc then finish machine, then Nitride,
it will work great except the nitride case depth will be approximately .010 max total case depth.
the outer surface should be 60 min HRc.
this will be the least amount of distortion.
the problem with nitride it is very hard & fragile. it will chip easily.
carbonitriding may be another option.
HTH
Mfgenggear
RE: Case hardening S2 Tool Steel?
1. Induce residual compressive stresses by shot peening or roller burnishing after nitriding.
2. Polish the surface after SP or RB. This can be hand polishing, vibratory finishing with appropriate media, etc.
RE: Case hardening S2 Tool Steel?
RE: Case hardening S2 Tool Steel?
Mfgenggear