Hard material or hardenable material

[jlarocque]

I have a need to heat treat a metal to 70 HRC I now use 4140 and its too soft and not enough hardenable and need to add carbide tips to compensate. I need to change the material and no heat is involved only wear and hardness.

still looking for the right machinable and hardenable material
JL

JL

 

[EdStainless]

Your use of carbide inserts may be the best option.
If you look at tool steels you might try CPM15V or CPM REX121. I don't think that you will hit 70Rc, but you can get close.

= = = = = = = = = = = = = = = = = = = =
Rust never sleeps
Neither should your protection

http://www.trent-tube.com/contact/Tech_Assist.cfm

 

[jlarocque]

I can get close yes! about 65

JL

 

[arunmrao]

If you are comfortable with RC65,then you could try the 15Cr3Mo high chrome iron along with 6%Va!!.Machine it in the annealed condition and then harden it. Ofcourse the Va additions improve life remarkably. But you are not near 70RC.

 

[tripleZ]

I've never managed to get more than 65 HRc out of CPM-15V. That was with oil quenching mind you, so your dimensional stability will be comprimised.

CPM-121 will get you damn close to 70 (68 has been my highest requirement thus far). That being said, if you've never machined it, it's much worse (in the unhardened state) than 15V. Small hole drilling the stuff is a pain, and it will blow through turning inserts as well.

CPM-T15, or most grades of T15 for that matter, will harden to 67 HRc. I don't know if you're grinding the tips or not, but I'd suggest going with the P/M grade CPM steels to take advantage of the smaller carbides. Grinding wrought T15 often leads to surface cracking if you're not careful.

 

[sreid]

Would case hardining possibly be a solution to your problem?

 

[JohnNabors]

If superficial hardness is okay for your application you can have 316SS Kolsterised to about 1100 Vickers which would be the equivalent of between 70 and 71 Rc.

 

[NickE]

Carbide, but its only grindable, though a pre-form could be made that gets you near net shape then all you'd need to do is grind the fine details out.

That will get you wear resistance and some toughness, though not too much of the latter.

Nick
I love materials science!