[TheForge] Re: TheForge digest, Vol 4 #221 - 8 msgs

Wed Apr 2 03:03:01 2003

Jim, Frosty;
The stuff caltrans ( state) gets here is usually " Astralloy" I think 
and is not so much hard as abraision resistant and tough...something to 
do with large aggregates of iron carbides I read somewhere. But these 
are for scraping the constant rock falls off the asphalt here on Hwy 1. 
They seem to be different than the the heavy plates that come off the 
D8s and the like, which are harder.

Jerry Frost wrote:

>----- Original Message -----
>From: "jim wallbridge" <[email protected]>
>To: <[email protected]>
>Sent: Monday, March 31, 2003 7:08 AM
>Subject: [TheForge] Re: TheForge digest, Vol 4 #221 - 8 msgs
>
>
>  
>
>>--
>>I would suspect that 1" grader edge would be made from one of the
>>51xx or 61xx alloys I mentioned as these are economical grades that
>>will provide high hardness (and therefore good wear resistance).
>>Some alloy content will be necessary to get a thick hardened layer.
>>I am surprised by your "it doesn't seem to anneal as this would
>>indicate to me a very expensive alloy. If so I would agree that heat
>>treating would not be needed. If it can be softened by a subcritical
>>anneal (e.g. 1300F for one hr.), I suspect that it will be
>>significant damaged (ivergeated in the heat treating termenology)by
>>the time that the anvil and the steel have been heated by makeshift
>>ways to get a reasonable cu based braze.  This is the reason for my
>>suggestion of a seperate heat treatment.
>>    
>>
>
>
>  
>
>>(James ME Wallbridge P. Eng.) Libertarian, Metallurgist, Wood & Metal
>>Worker, Fly Fisher,  Resident of Calgary,  Canada's new head office
>>location of choice.   Permission is hereby given to use any or all
>>information herein, as an attributed quote, unless the body of the
>>message states otherwise.
>>_______________________________________________
>>    
>>
>
>I've tried a number of times to anneal the stuff, including over a weekend
>in an electronically controlled ramping electric muffle furnace (kiln) to no
>avail. I took it to non-magnetic and let the muffle furnace have it for
>three days.
>
>I just wanted to drill some holes in a piece. It eats carbide and lesser
>bits like candy and I'm not so serious as to buy a diamond bit. Also, the
>existing "blade bolt" holes appear to be hot punched and drifted/forged to
>shape. (Blade or runner bolts are similar to carriage bolts except they have
>a counter sunk head and hole with a square shoulder so they finish flush
>with a runner, blade, etc.)
>
>I've asked the factory rep for a data sheet and all I get is that, "I'm not
>telling you diddly," smile. I can say for sure it's a fairly expensive
>alloy, a 1" x 12" x  48" section costs $80 +/- and the state buys in
>quantity.
>
>When we get around to attempting forge brazing the stuff I'll keep a real
>close eye out for degradation.
>
>Thanks,
>
>Frosty
>------------------------
>If it ain't forged
>it ain't real.
>Wrought iron is.
>The FrostWorks
>
>Meadow Lakes, AK.
>
>
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