[TheForge] Heat treating

[dann at wctatel.net]

When you first wrote about hardening, & the confrontational guy telling
you that spring steel would tend to return to its original shape: I
thought of an example that would be quite at odds to his desciption...  
flint strikers forged from commercial garage door coil springs.   When
quenced from red hot into cold water, the newly made striker can be so
brittle - hard, that if dropped on concrete, it will shatter like glass.

If I can keep my smile and think on my feet, I can disarm the agressor...
but  the "Shields UP" mostly hits me when a confrontational  person  hits
one of  my pre-programmed buttons.  When something like that happens, I
tend to have an example ready for "next time".

Dann


> Good point. It's not the first time that I've had someone in the crowd
> like that. I often end up learning something as I later do research so I
> can add to my base of knowledge, and hence the question...
>
> Like I said, I could have handled it a little better, but it's hard to
> be passive when someone simply states "No it doesn't, He's wrong." Then
> it was "shields up" and I got caught up in the debate, and _my_ wife
> wasn't there to remind me to behave :-)
>
> **paul
>
> On 12/6/11 8:20 AM, Bob Ehrenberger wrote:
>> Paul,
>>
>> Most people tend to use the term "tempering" to represent the whole heat
>> treating process, and don't understand that tempering is just one part
>> of
>> the process.
>>
>> I had someone try to tell me that if I used a spring to make tools that
>> it
>> would return to it's curved shape at a later time. I tried to tell him
>> that
>> when I heated it up, it reset it's shape never to return. In the end we
>> had
>> to agree to disagree. You have to decide what you want to fight about,
>> once
>> there is an impass figure out a way to change the subject. It doesn't do
>> your demonstration any good to argue with the customers.
>>
>> Robert Ehrenberger
>> Shelbyville, Mo.
>> eforge at centurytel.net
>>
>> On Mon, Dec 5, 2011 at 9:59 PM, Paul Novorolsky<crosspein at sbcglobal.net>
>> wrote:
>>> During a public demonstration last weekend, I was explaining to someone
>>> about hardening and tempering in pretty general terms. When I said that
>>> tempering sacrifices some hardness for toughness, a spectator told me I
>>> was wrong. He pretty much said "No it doesn't, tempering makes it
>>> harder".
>>>
>>> I disagreed assuming he had hardness and toughness confused, stating
>>> that the heat treating charts for common steels show a reduction in
>>> hardness at various tempering levels. He continued to tell me I was
>>> wrong, because he had bought 100's of tons of "full hard stainless
>>> steel" and asked how I explain that material. I told him I had no
>>> knowledge of it, but tool steels will lose some hardness during
>>> tempering. He repeated that I was wrong. At that point I was agitated,
>>> and told him to do some research and he'll see that tempering does
>>> result in loss of hardness, at which time his wife seemed annoyed with
>>> him and dragged him out of our shop. (amusing in itself, as he was a
>>> big
>>> man)
>>
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