90 to 100 KSI yield brittle material

[waterlilly]

Hello,
I am looking for a material with a yield strength from 90 to 100 ksi. And I want a brittle material so that it can shear at the right torque instead of smear the shear pin.
Can anyone please help me.
we were using some low alloy or Carbon steel, with a yield strength from 48ksi to 70ksi. but then, the shear pin can not take the torque we want to apply. And to make things worse, instead of shear at the torque, it begins to smear first, then it will be so messed up, and has to be grinded out.
Then we were thinking to use StressProof material, it has a yield of 120 Ksi. It is really a brittle material as we wanted. And the pins always shears properly. but the breaking torque is too high.
I want to find some material in between the Alloy and the StressProof, with a yield of 90 to 100 ksi, and with the brittleness of stressproof material. and not much more expensive than the current alloy pin, which is 4.00 dollars for a 0.25" size.
thanks very much for reading my thread. and please give me some information.

 

[BillPSU]

The reason Stressproof shears is because of the sulphur in the base material. Sulphur is the reason the material acts brittle. Instead of changing material why don't you try reducing the strength level of your base material. The material can be drawn down in hardness by putting in an oven at 350-450 degrees and get your desired hardness/strength.

 

[waterlilly]

Thanks, BillPSU.
but from my limited knowledge about Stressproof material is that once you start to use oven to reduce the strength level, it will loose all its strength and becomes a very low yield stress material. we don't know a heating process can allow the stressproof material to drop from 120K to 90K. after apply heat, it just drops too much.
That is why i am looking for another material, maybe bronze or something... but bronze is too low yield for my application.
Any other suggestions?

 

[TVP]

waterlilly,

Another grade of steel would be appropriate for a yield strength of ~ 90 ksi. A standard SAE 1045 with ~ 20% reduction in area during cold drawing will strain harden to ~ 90 ksi yield strength. There are any number of cold drawn steel bar suppliers capable of producing this, including Niagara-LaSalle (makers of Stressproof®).

 

[waterlilly]

Thank you so much, TVP.
I think SAE 1045 is the material I am looking for.
talk to you next time.