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03-08-2012, 10:02 AM | #3 | ||||||
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No. Not at all. Each type of part is packed into the case hardening crucible separately. What I have learned is that the crucibles containing the various parts are not subjected to the same furnance time.
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The Following 3 Users Say Thank You to Bruce Day For Your Post: |
03-08-2012, 10:04 AM | #4 | ||||||
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Deleted. I asked the same question and got my answer. Thanks.
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03-08-2012, 10:12 PM | #5 | ||||||
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Are you certain of that? I received regular orders from Colt, in West Hartford for these "crucible". In the case of Colt, they were a 5x5x10" box, cast in a martensitic alloy (called CA6-NM, for those that care) I have been in the heat treating department at Colts many times, and, at least in their case, the boxes aren't unclamped until back to room temperature.
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The Following User Says Thank You to edgarspencer For Your Post: |
03-08-2012, 10:20 PM | #6 | ||||||
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The parts were strategically placed in the crucibles with bone, shards of hide and various other biologic 'packing' around the parts. The frame was not placed in the crucibles as an assembled unit.
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03-08-2012, 10:36 PM | #7 | ||||||
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After my last post, I decided Bruce is right, in that the parts, after the normalizing cycle at 1650-1700 degrees, get a temper/stress relieving cycle, at under 1125 degrees, in a controlled atmosphere furnace, and not in the boxes they are normalized in.
Dean is correct. They are individually heat treated. The secret to the color is in the packing, and composition of carbon bearing packing material. I never hear anyone mention it today, but one of the old materials was horse manure. No $hit ! |
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The Following 4 Users Say Thank You to edgarspencer For Your Post: |
03-08-2012, 10:51 PM | #8 | ||||||
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Most any carbon bearing material can produce the desired results.
My neice, an aspiring artist, fired this pretty piece of pottery packed predominantly in salt-marsh straw. So here we have a new twist on color heat treating. . |
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The Following 2 Users Say Thank You to Dean Romig For Your Post: |
03-09-2012, 04:14 AM | #9 | ||||||
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edger: your temperatures regarding hardening and tempering are most interesting and specific. are they specific to colt's process only?
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03-09-2012, 04:21 AM | #10 | ||||||
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bruce: your comments regarding the differences in how frames and trigger plates are processed is interesting and new to me. perhaps all parts are hardened to the same spec, but then tempered to different specs, depending on the amount of elasticity desired?
i am no expert either, but do find the subject of factory shotgun receiver hardening and coloring to be fascinating. |
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