cpm cru wear heat treat recipe

[Knife420Guy]

I recently got a lot of cpm cru wear. And was wondering if anyone had a good step by step on how to heat treat it. Any help would be appreciated

 

[Hashishiin]

Let us know what you do with it when it's done! I love Cruwear.

 

[Seedy Lot]

Foil wrap. Place in heated oven, I prefer 1955-1980 f. Soak for 30 minutes. Quench between aluminum plates for a couple minutes then remove foil and into cryo for at least 30 minutes. Temper between 300-400 f depending on your desired hardenss.

My current EDC knife I ran an 1980 oven and tempered at 300 f for 2 hours 2 times. Knife is 64.5 Rc and has held up amazingly well for my use over the last couple months.

 

[HSC ///]

Foil wrap blades
2000F furnace temp
Place foil pouch in furnace
Timer 45 mins.
Aluminum plate quench
Liquid nitrogen soak
Temper 1000F for two hours x2
Yields 63 rc

 

[Seedy Lot]

To each their own but from what I understand cryo soak is used to lower RA. With a high temper, around 950F and above, the RA is converted into secondary carbides so if one is using high temper then cryo is not needed.

 

[TheEdge01]

To each their own but from what I understand cryo soak is used to lower RA. With a high temper, around 950F and above, the RA is converted into secondary carbides so if one is using high temper then cryo is not needed.

Actually, cryo converts retained austenite into martensite which increases the hrc. The temper cycles relieve stressors in the steel which lowers the hrc but increases toughness.

 

[Seedy Lot]

Would not converting RA to martensite lower the RA level in the steel?

Does not the formation of secondary carbides within the steel give a hardenss bump?

Actually, cryo converts retained austenite into martensite which increases the hrc. The temper cycles relieve stressors in the steel which lowers the hrc but increases toughness.