[TheForge] Now cold shuts - 304 stainless

[David E. Smucker]

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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