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The Folding Knife (& Switchblade) Forum The materials, techniques and the designing of folding knives. |
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#1
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first slip joint
I would like to try and make my first slip joint. steel will be 440c or ats 34 I have heat treat information for the blade but I don't have anything for the spring. any help will be appreciated.
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#2
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Here is what I have for spring tempering 440C and ATS-34.
440C S.S. Springs & Rockers 43 to 45 RC 1100?F 1 hr. 1 time ATS-34 S.S. Springs & Rockers 43 to 45 RC 1200?F 2 hrs. 2 times Seems to work well for me. Bill |
#3
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thanks Bill, what do you quench the ats 34 with?
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#4
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I air cool it in front of a fan.
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#5
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Quote:
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#6
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Also for future reference you may want to book mark this link. I like my springs to be a little harder than the hardness given here but they are a good guide to figure out what works for you.
http://www.evenheat-kiln.com/technic.../heattreat.htm |
#7
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thanks Kirby, I was reading a old thread that also suggested 1160 for one hour one time. would 60 degrees make much of a difference?
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#8
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22H2, Yes a 60 degree difference will change the Rockwell hardness. Assuming you have a hardness tester, the best advice I can give you is to start at the low end, may be as low as 1050 degrees. Then step up in 25 degree increments until you reach the desired hardness. I like my springs to Rockwell around 48-50.
The thing about using any printed heat treating specs is that there not using your equipment to get there specs so you must do a little testing to get things figured out. Happy Heat Treating!!!!! |
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blade, knife |
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