[TheForge] Re: Steel question OT

[David E. Smucker]

Andy,  I don't know the effect of the increased Carbon on corrosion -- I 
just became aware of the use of case hardened wrought iron for large machine 
bolts (in late 1800's) when finding information about the company that made 
a shaper that I purchased.  My shaper is from WWII but I found company 
information dating back to the 1800's.

What would be interesting would be to have some samples of your wrought iron 
checked to see what really is the carbon content and what else might be 
present.  Different wrought irons from different ores had various content. 
I know that some wrought irons from Germany had high Manganese content 
because the ore was high in Manganese.  This resulted in a wrought iron that 
could be "hardened".  (This bit of information from a German Mill builder I 
worked with in the 80's and 90's).

Dave
----- Original Message ----- 
From: "Andrew Vida" <osan at netlabs.net>
To: "Sponsored by ABANA" <theforge at mailman.qth.net>
Sent: Monday, January 01, 2007 6:28 PM
Subject: Re: [TheForge] Re: Steel question OT


>
>
> David E. Smucker wrote:
>>
>> ----- Original Message ----- From: "Andrew Vida" <osan at netlabs.net>
>> To: <artgawk at thegrid.net>; "Sponsored by ABANA" 
>> <theforge at mailman.qth.net>
>> Sent: Monday, January 01, 2007 10:04 AM
>> Subject: Re: [TheForge] Re: Steel question OT
>>
>> Andy, what form or section is this "wrought iron"?
>
> Many different forms, but the largest are 12" channels.  There's plenty of 
> welded-seam pipe and boiler plate, about 3/8" gage.  All manner of bolts 
> and 2" and 4" bar.  Unfortunately a lot of the nice stuff went to the 
> melter
>
> > In the late 1800's
>> some wrought iron was case hardened.  This was especially true of large 
>> nuts and bolts and some rod forms.  I am not aware that this was done 
>> with structural forms.  Some manufactures of equipment would state the 
>> higher quialty of their machines by saying that "hardware is case 
>> hardened wrought iron".
>
> Any idea how the introduction of the C affected the corrosion resistance? 
> Would it lower it or does the presence of silicates retain the resistant 
> properties?
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