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Ed Caffrey's Workshop Talk to Ed Caffrey ... The Montana Bladesmith! Tips, tricks and more from an ABS Mastersmith.

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Old 03-26-2003, 06:08 PM
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Nathan Taylor Nathan Taylor is offline
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A-2 Heat Treat

First things first-I am glad to hear Ed is back safe, and I intend to keep you and all of our service men and women in my prayers.
I have stumbled across a large bar of A-2 and was wondering if it is possible to sub-zero quinch? (If it is Suggestions please) I have always used oil harding steel and do not have the capability to air harden. Or would it be best for me to swallow my pride and send it out to be done professionally? Thanks
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Old 03-26-2003, 06:15 PM
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Ed Caffrey Ed Caffrey is offline
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A-2......

Hi Nathan!
Thanks for the kind words, and for remembering all of those who are still over "There".

On the A-2, you can oil quench it, but I would suggest experimenting a bit to find out if you get the results you desire. I can't personally speak to ever having sub-zero quenched any A-2, however, looking at the chemistry (5.2% Cr.) I would think that it would react favorably. If your going to make a blade that you plan to sell, I would highly encourage that you either take the time to work out a heat treatment in your shop, or send it to a professional heat treater. Your reputation is not worth guessing at something that will be out there in the public!


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Old 03-27-2003, 05:14 PM
Jason Cutter Jason Cutter is offline
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What they tell me ...

My HT-ers tell me that the sub-zero quench cycle and multiple tempering cycles will assist maximal conversion of any retained austenite to martensite. This works best in higher-alloyed steels like stainless steels but even low-alloy / plain carbon steels like 1084/1095 will derive SOME benefit. Basically, sub-zero is good for any martensitic high-carbon steel - and thats what we use to make knives.

A-2 has chrome and molybdenum in it and technically it is up there with the "high-alloys" and responds best to an air quench and it should do well with the sub-zero. That's all theory to me but it may be worth doing if you're already doing that with other steels and then doing some basic testing including a Rockwell test.

Heehee, I'm kinda hoping you'll check it out and let us know what you find...

Cheers. Jason.


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