Hardest Stainless Steel Gades
Hardest Stainless Steel Gades
(OP)
I'm trying to find the hardest and strongest possible stainless steel, I have been recomended 17-4ph 900, what are the alternatives?
I also need to find the hardest and strongest non-mag stainless steel, I belive we are using nitronic?
The steel is needed to make tips for probes we push in the ground, the non-mag version houses a magnetometer.
Thanks.
I also need to find the hardest and strongest non-mag stainless steel, I belive we are using nitronic?
The steel is needed to make tips for probes we push in the ground, the non-mag version houses a magnetometer.
Thanks.





RE: Hardest Stainless Steel Gades
RE: Hardest Stainless Steel Gades
Michael McGuire
http://stainlesssteelforengineers.blogspot.com/
RE: Hardest Stainless Steel Gades
RE: Hardest Stainless Steel Gades
440c is interesting, one supplier is quoting an elongation factor of 2% min, is this the same as fracture toughness? I worry these quality's will make 440c unsuitable due to side loads experienced when pushing through glacial till.
A-286 looks to be ideal, thanks.
RE: Hardest Stainless Steel Gades
You can get cold drawn austenitic stainless (21-6-9) that is fully non-magnetic at strengths in the range of 175ksi.
You would get similar numbers for A286, maybe a bit higher if you cold worked and aged (without an anneal in between).
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Plymouth Tube
RE: Hardest Stainless Steel Gades
Interesting stuff Kolsterising.
is it similar to carbo-nitriding?
are you working with it now.
having a hard surface with a tough core would do the trick?
mfgenggear
RE: Hardest Stainless Steel Gades
Mail id is mario.ciampini@bodycote.com
RE: Hardest Stainless Steel Gades
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Plymouth Tube
RE: Hardest Stainless Steel Gades
RE: Hardest Stainless Steel Gades
ATI S240 in the H950 will give you a hardness of 48-50HRc and a YS of about 230ksi. The advantage it has over 440C is that it is a high-strength PH grade (similar to 17-4ph)so it maintains toughness (10% elongation).
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Non-magnetic...
718 to the AMS 5663 specification will give you the highest stregnth - but you are paying the price of nickel.
Another idea is an alloy such as Datalloy 2 ESR. It is a high-strength austenitic stainless steel. It comes with a minimum yield strength of 140ksi. The nice thing is that it is Mn stabalized, so it helps with the cost.
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RE: Hardest Stainless Steel Gades
why not have a precipitation harden steel core harden
for strength then case harden the surface for wear.
Mfgenggear
RE: Hardest Stainless Steel Gades
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Plymouth Tube
RE: Hardest Stainless Steel Gades
Michael McGuire
http://stainlesssteelforengineers.blogspot.com/
RE: Hardest Stainless Steel Gades
I ask, because the magnetic properties of the steel change drastically with strain state, and it can be hard to get consist product magnetically, especially when your desired permeability is 1.
If you need it to be nonmagnetic, you should really consider a nonferrous alloy - inconel, titanium, aluminum, or bronze. I would likely recommend a very strong aluminum, like a well-tempered 7475, since aluminums tend to be cheaper and easier to work with that the others named above.
RE: Hardest Stainless Steel Gades
Ed - The probes are repeatedly inserted into the ground, hence the need for a harder material. The nitronic non-mag tips can wear very quickly, I believe the nitronic has a hardness of 95HRb.
ATI S240 looks an improvement on 17/4ph, Custom 465 seems to have very similar characteristics too.
Datalloy also looks good.
Magnetdave - This is interesting, I remember being told of an older magnetometer system we previously used that had bronze tips, I had wondered why they chose that material.
I have tried loading a nitronic tip in a 200kN press, and simpply tested the material with a magnet, I think I may have to load the entire probe and look for a change in o/p.
RE: Hardest Stainless Steel Gades
If the tip and body need to be non-magnetic, and it is a fairly small part, then there are a few other alloys that come to mind.
I would seriously consider a tip cast in Tantung. This a non-magnetic and rather hard.
As for your shell, if you having wear issues some as-cold-drawn (not annealed) Nitronic (any of them) will be quite suitable.
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Plymouth Tube
RE: Hardest Stainless Steel Gades
Yeah, S240 is similar to 465 - except it does not need a deep freeze during processing. I have seen prints that have them both as options.
I know of Datalloy 2 ESR as a drill collar material. However, drill collars are relatively large diameter so if you if you are looking for small diameter stuff you may out of luck.