[TheForge] Now cold shuts - 304 stainless

[Peter Fels & Phoebe Palmer]

Thank you all gentlemen ,, I have  been a chronic dinker and a sucker 
for those last few cold blows...I will try to mend my ways...pf

Grant Marcoux wrote:
> I have forged ATS-34 blades by hand as well as 304 and 304L.  I have found
> that these steels are very poor conductors of heat  compared to simpler
> steels and they must be worked very hot.  Forging color for these is in the
> yellow range and you must experiment with the steel in question for best
> results.  These alloys are absolutely unforgiving of being worked too cold
> (or hot) and will crack or crumble if worked at the wrong temperature.
> 
> ATS blades must only be worked at full heat, so you are forging small
> sections at a time.  To forge a 10" slicer blade takes me all morning.
> 
> Also, these alloys do not like to be struck on a narrow rectangle section if
> they are the least bit cold...a sure fire recipe for a longitudinal crack.
> Eeeek!
> 
> Grant
> 
> -----Original Message-----
> From: theforge-bounces at mailman.qth.net
> [mailto:theforge-bounces at mailman.qth.net]On Behalf Of David E. Smucker
> Sent: Tuesday, May 27, 2008 3:43 PM
> To: Blacksmithing List Sponsored by ABANA
> Subject: Re: [TheForge] Now cold shuts - 304 stainless
> 
> 
> Try forging at a higher temperature and quit as it cools.  I don't know if
> 304 has problems with going hot short but it might, if it breaks up at the
> high temperatures -- it is going hot short.  You are now too HOT.
> 
> But the core problem with high strength materials such as 304 or tools
> steels is that at colder temperatures you are only forging on the surface --
> the reduction work is not going very deep and this can lead to cold shuts --
> and making cracks once started move quickly along the path between the
> "forged area" and the unmoving center.
> 
> Get it HOT and hit it HARD, no cold dinking allowed.
> 
> Dave
> 
> 
> 
> --------------------------------------------------
> From: "Peter Fels & Phoebe Palmer" <artgawk at thegrid.net>
> Sent: Tuesday, May 27, 2008 6:06 PM
> To: "Blacksmithing List Sponsored by ABANA" <theforge at mailman.qth.net>
> Subject: Re: [TheForge] Safety -- Turning Things Off topic
> 
>> Good sirs;
>> I like machinery too,and the first few exchanges were interesting...but.
>>
>> BS then.
>> I've been forging 304(?) scrap stainless recently and the cold shuts and
>> their propagating cracks are getting frustrating. Same with some bronzes
>> and tool steels.
>> Especially true when extensive upsetting is called for.
>> I end up spending time grinding out the surface flaws, flaps, nicks and so
>> on, isn't all that much fun.
>> Help, hints or expositions please......pete f
>>
>> Andrew Vida wrote:
>>>
>>> Peter Hirst wrote:
>>>> This is not my field, but I just did a little reading and its pretty
>>>> simple. A lot of right aileron, AND just a little right rudder.
>>>> Apparently all that right aeleron increases drag asymmetrically, and a
>>>> LITTLE right rudder is needed to balance it.
>>>
>>>
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