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<DIV dir=ltr align=left><SPAN class=687201214-27032007>Mild steel starts to go
plastic at around 56000 lbs/sq inch, 500 cwt/sq inch.</SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=687201214-27032007>Stainless is available in
a lot of different grades, and each grade is available between annealed and full
hard.</SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=687201214-27032007>301 stainless is about
30000 annealed to 140000 full hard</SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=687201214-27032007>It would appear that the
normal for an I section beam is grade 304 annealed normally at a yield of 31200
lbs/sq inch.</SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=687201214-27032007>That is only a little
over half the strength of MS. Young's modulus is also down similarly, so
deflection for a given load will increase. Stainless also has a higher expansion
coefficient than MS, which matches stone or concrete well.</SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=687201214-27032007>Not the ideal material
and a bit expensive.</SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=687201214-27032007></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=687201214-27032007><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=687201214-27032007>Information on buried
pipe work suggests that there is little difference in corrosion rates of the
various ferrous materials in a wet corrosive soil, so if the tower is a very wet
one, perhaps stainless wall cleats with steel RSJ's may be worth a look,
stainless and steel fairly close on the electro chemical table, (0.25V) so the
corrosion problem at the interface is not excessive, but should be
protected.</SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=687201214-27032007></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=687201214-27032007></SPAN> </DIV>
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<FONT face=Tahoma size=2><B>From:</B> bellhistorians@yahoogroups.com
[mailto:bellhistorians@yahoogroups.com] <B>On Behalf Of </B>Andrew
Aspland<BR><B>Sent:</B> 27 March 2007 14:46<BR><B>To:</B>
bellhistorians@yahoogroups.com<BR><B>Subject:</B> Re: [Bell Historians] A bell
frame problem<BR></FONT><BR></DIV>
<DIV></DIV>
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<P>Is stainless steel suitable - is it as strong as mild<BR>steel?<BR>Sounds to
me like the lowest set of beams could be<BR>rolling to and fro as the beams
above push and pull. <BR>Rather than try to replace the single bolts how
about<BR>some system of anchoring all the intersections of<BR>beams so that the
rolling is reduced - possible<BR>anchoring the ends of the lowest beams into the
walls.<BR>Resting on corbels does not prevent the
rolling!<BR>Andrew<BR><BR><BR><BR><BR>____________<WBR>_________<WBR>_________<WBR>_________<WBR>_________<WBR>_________<WBR>_
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