[TheForge] Now cold shuts - 304 stainless

[Peter Fels & Phoebe Palmer]

Good...i'll pay more attention.
Thanks Dave

David E. Smucker wrote:
> 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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