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Joined: Jan 2002
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Sidelock
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Sidelock
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Mark, at least in theory, annealing is a reset to "original" properties of hardness for the alloy used.
DDA The hardness on annealing may have a similarity to the original part, but shouldn't the case, by definition, be a different steel than the original? If the original alloy for the part is low carbon steel (likely), then there is no hardening from heat treat and no softening from annealing. The case has higher carbon content than low as it does harden. If it will harden, then it will anneal (excepting some exotic alloys). So, if we anneal a part, the case is made softer and the core is unchanged. It is possible/probable that the case will get higher in carbon and deeper with repeat cycles. However, if the anneal is done properly there should be no reason for the case to become brittle. Maybe, the original question had to do with each case color cycle adding some bit more carbon and increasing the resulting depth of the case? Likely. Are we thinking that annealing removes the carbon that created the original or a subsequent case? No. DDA
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Sidelock
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Sidelock
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[quote=Rocketman]Mark, at least in theory, annealing is a reset to "original" properties of hardness for the alloy used.
DDA ....It is possible/probable that the case will get higher in carbon and deeper with repeat cycles. However, if the anneal is done properly there should be no reason for the case to become brittle.... ....DDA I appreciate the clarifying, as I was thinking it would be unlikely to back the carbon out of a part. I understand that is not what you're saying. Regardless of the care taken in annealing, likely brittleness would come on quenching, as the original thought was to create colors/hardness? But, could a thicker case result in more, for example, tang cracks at screw holes, or warping due to the higher stress an increased percentage of high carbon steel can put on a part when it's hardened? A curiousity is that gun part annealing, thought to be critically important, is regularly said to be done in a charcoal pack.
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Joined: Feb 2002
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Sidelock
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Sidelock
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Please show me a shotgun on that website. They don't like them or they have never worked on one.
Last edited by eightbore; 06/05/18 05:03 PM.
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Sidelock
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Sidelock
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let us awl remember dat re case coloring is not the same as re case hardening, which may, or may not result in re case coloring as a by product of the re case hardening process...
Last edited by ed good; 06/06/18 08:28 PM.
keep it simple and keep it safe...
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Joined: Jan 2002
Posts: 5,954 Likes: 12
Sidelock
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Sidelock
Joined: Jan 2002
Posts: 5,954 Likes: 12 |
Regardless of the care taken in annealing, likely brittleness would come on quenching, as the original thought was to create colors/hardness?
Issues of hardness vs brittleness are taken care of by tempering.
But, could a thicker case result in more, for example, tang cracks at screw holes, or warping due to the higher stress an increased percentage of high carbon steel can put on a part when it's hardened?
See above.
A curiousity is that gun part annealing, thought to be critically important, is regularly said to be done in a charcoal pack.
A charcoal pack will easily reach annealing temperature , even for high carbon steels. Hardening temperature is usually a bit higher than annealing. Ergo, the part is annealed prior reaching hardening temperature more or less automatically.
DDA
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Joined: Feb 2008
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Sidelock
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Sidelock
Joined: Feb 2008
Posts: 11,788 Likes: 673 |
let us awl remember dat re case coloring is not the same as re case hardening, which may, or may not result in re case coloring as a by product of the re case hardening process... An awl is a sharp tool, similar to the the one that was used during your lobotomy Ed. Case coloring is another term for case hardening where the hard surface also has a distinctive coloration. The word case describes the thin carburized skin where carbon content is increased to provide a very hard and wear resistant surface while maintaining a tough lower carbon core. It is typically only a few thousandths of an inch deep, but case depths of up to .3" are possible, though not utilized for gun parts. This is far different than your ghastly psychedelic acetylene torch colors which you used to fool uneducated gun buyers. All those are is localized overheating of the steel to produce short lived tempering colors which have very little durability, and zero visual appeal to anybody but a complete idiot... which explains your affinity for them. Your torch colors also in no way appeared similar to original bone charcoal case or cyanide case colors as applied by gun makers, despite your sales pitches describing them as such. I still recall the ugly Parker with obvious torch bullseyes that you claimed was likely done by DelGrego. You would make a good used car salesman. In my opinion, you were being intentionally deceptive. But in all fairness, your dishonesty and disgusting torch colors aren't nearly as bad as your frequent anti-gun trolling. Anti-Gun Posts by Ed Good
Voting for anti-gun Democrats is dumber than giving treats to a dog that shits on a Persian Rug
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Joined: Jan 2002
Posts: 10,137 Likes: 125
Sidelock
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Sidelock
Joined: Jan 2002
Posts: 10,137 Likes: 125 |
ah yes, above we have a typical skitzo post...
some of what we see here is by the sane and knowledgeable keith...
and some of what we see here is by the wacko and ignorant keet...
keep it simple and keep it safe...
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