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Question for Steve(the Alloy guy)

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Walt

08-16-2000 15:05:52




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When you heat metal with a torch for the purpose of bending it, does it retain most of its original strength by letting it cool naturally?
Thanks in advance.




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Steve U.S. Alloys

08-17-2000 06:41:29




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 Re: Question for Steve(the Alloy guy) in reply to Walt, 08-16-2000 15:05:52  
Hi Walt,
That's a pretty broad question. Any time you heat a piece of metal you are going to change the molecular structure to some degree. Some materials are effected to a lesser degree than others. The amount of heat that was applied is also going to make a difference. Generally speaking, low carbon steel is less likely to be adversely effected by heating and bending than let's say 316 stainless would be. Carbon content of steels plays a large roll also as carbides migrate to the heat effected zone and tend to concentrate there. Hardened steel will be greatly effected by heating to critical temps. Typically, the critical temperature of heat treated materials is between 1330�F and 1440�F. Staying below that range would be beneficial if heat treated properties are to be maintained in those type of metals. Cooling steels at ambient temperature will have a totally different effect than quenching.
Steve

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Walt

08-18-2000 04:35:31




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 Re: Re: Question for Steve(the Alloy guy) in reply to Steve U.S. Alloys, 08-17-2000 06:41:29  
Thanks, I meant something like mild steel. So does ambient cooling or quenching retain most of the original strength? Logically it seems that quenching would make the metal significantly weaker.



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Steve U.S. Alloys

08-18-2000 05:34:26




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 Re: Re: Re: Question for Steve(the Alloy guy) in reply to Walt, 08-18-2000 04:35:31  
Hi Walt,
Quenching stops the metal transformation between grain phases. (In their tracks if you will.) The end result is often a harder material. This will effectively make some metals brittle. You can even heat a stick in a campfire and quench it in water to harden the end. Metal properties go beyond tensile strength alone. Slight changes in tensile strength may not be as important as a change in certain other properties such as elongation, yield strength or compressive strength.

Low carbon steel is not considered to be a hardenable metal. You will still draw carbides out and quenching can make a slightly harder shell on the outside. Heating just enough to bend w/o cracking will not effect it as much as the rate of cooling. The low carbon steel you have now was air cooled to ambient temps at the mill where it was manufactured. When you go to the drawing mills, you may see wires go thru a heating process to predetermined temps to allow for drawing and the wire can be annealed or designed for specific hardness depending on the end use. The speed of the line is timed so that the wire is in the heat for the desired length of time. When our #2 stainless wire is manufactured in 1/8", it's spec for the arc gun is .125+/- .001 dia. and 1 hole hard tensile spec AISI and bright grease drawn clean at finish. Chemistry is held to exacting specs as well. Some wires are drawn from annealed coils and others are cold drawn. Steve

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walt

08-18-2000 12:24:44




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 Re: Re: Re: Re: Question for Steve(the Alloy guy) in reply to Steve U.S. Alloys, 08-18-2000 05:34:26  
Thanks for the explanation. Helps alot!



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