Molten salt quench CPM-3V Pictures

[shqxk]

Would like to share my process of heat treating CPM-3V,

This was done at the knife shop of my friend. I lets the worker perform because molten nitrate salt is quit dangerous to who's inexperienced.

Let the picture speak for itself

Here is my process.

Stainless foil wrapped
Stress relief at 1125F soak 2hour, furnace cool overnight
Austenitizing 1960F
Quench in 500F molten nitrate salt, equalize for 2 minute
Air cool
Remove foil and straight to L2N, soak overnight
2 x Temper at 400F each

















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[nguyenquan]

Hello !

Im interesting about your HT, so many new way. Could you share something more ? Ex : Result, testing.....

Thanks you !

 

[jdm61]

Gotta love the Soviet era Bulgarian motorcycle helmet.

 

[shqxk]

We have been successful using molten nitrate salt for quenching low alloy carbon steel for a while.

Steel like 52100, 5160 and O1 seems to got a good result with it. But we use digital control gas oven for that type of steel. The marquenching method itself has been proven to be a great way to quenching most steel.

For this small batch of CPM-3V its seems like the accuracy of thermocouple on this electric kiln is off (we did this at my friend shop and the guy who perform th HT is his employee) and we got much lower hardness compare to what I got with Evenheat kiln.

 

[KnuckleDownKnives]

Gotta love the Soviet era Bulgarian motorcycle helmet.

That actually looks like an old sandblasting helmet. Typically they would have an apron that comes down over your neck shoulders and chest. They have an air supply line coming in from the back that lets out over the top of your head to help keep you cool and give you fresh filtered air. I used to wear a modified nova 2000 blast helmet when I was doing thermal arc spraying on bridges. We'd have to take the clear lenses out and make dark lenses out of #5 tinted face shields to protect are eyes from the arc. The one above actually has head gear in it much like a hard hat. The nova's we used to use had foam pads in them like a motorcycle helmet. They were much more comfortable when you had to wear them for 12hr shifts.