| The Shop > Metal Stuff |
| What caused this? |
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| jonesie:
HI ADAM.i have done a lot of heat treating in moldwork and where i now work, and i never wrap anything that i am going to oil or water quench,it is to hard to get out of the foil and , into the oil or water,the quicker into the oil or water the better. i am sure some will disagree.you can get the foil from msc or travers.it comes in two thicknesses but get the thinner as it is easier to tear to get parts out. we always leave a little on the over all to remove the decarb.on the o1 or 4140. we seldom ever use w1, like said before using wood i use a piece of paper.be careful as the foil is like a new razor, wear gloves.doing another test piece is the best idea to see if it does again, your steel might have been miss marked or is not w1. just the way i do it and i am not a metallurgist, good luck jonesie |
| awemawson:
I fold up a parcel of the foil in such a shape I can hold one one with pliers and cut the other end off with snips. So the action is - withdraw from kiln onto firebrick surface, grab one end with pliers, snip off the other end, pick up brick, tilt over oil vat still holding one end with pliers. Item slips out into vat. Not so easy for big items, but works a treat for lathe tool sized things. |
| adamriley:
Thanks for the responses. I tried heating some more silver steel offcuts (from bar that I KNOW DIDN'T DO THIS BEFORE), and it's happened again, albeit to a lesser extent this time. Also, it doesn't seem to be as hard. It's definitely not hard enough to worry the file. As an aside, what is the best way to minimise/prevent scaling? The parts I'm making are for 'fancy' woodwork tools and they need a polished surface. I'll try to get a picture of the failed attempt. Adam. |
| adamriley:
Just to update this thread. I ordered more ss, and remachined the parts. This time they hardened properly, with no changes. Must have been a duff batch. Thanks for all the help. Adam. |
| vtsteam:
--- Quote from: adamriley on March 02, 2013, 03:00:39 PM ---Thanks for the responses. I tried heating some more silver steel offcuts (from bar that I KNOW DIDN'T DO THIS BEFORE), and it's happened again, albeit to a lesser extent this time. Also, it doesn't seem to be as hard. It's definitely not hard enough to worry the file. Adam. --- End quote --- Doesn't explain the above. Another explanation which would include the above would be kiln contamination that gradually burned off after a few heating cycles. |
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