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RE: Bronze (One-legged Support) Horse Structure

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The last time I got relative prices on stainless steels:
A36 Carbon steel - 1
304 Stainless - x3
316 Stainless - x8
Carpenter 20 - x20 (I don't know if this is how they named it or not)

The above ratios are for unfabricated stock steel.  As you can see if you
assume a range of $0.25 to $0.35 per pound for carbon steel, Carp 20 will
run $5.00 to $7.00 per pound.  This info is about 5 year old.  

Carpenter does have a web site, but I don't know it off hand.

Harold Sprague
The Neenan Company
harold.sprague(--nospam--at)neenan.com


-----Original Message-----
From: Horning, Dick/CVO [mailto:dhorning(--nospam--at)CH2M.com]
Sent: Tuesday, November 17, 1998 4:26 PM
To: 'seaint(--nospam--at)seaint.org'
Subject: RE: Bronze (One-legged Support) Horse Structure


For John Schwarz' benefit, our copy of Carpenter shows a 20Cb-3 alloy, Fy =
48 ksi, Fu = 91 ksi, 45% elongation, 200 ft-lbs Charpy.  Originally
developed for resistance to sulfuric acid, so it should be OK for his
application.  
No, Harold, I haven't a clue as to cost.  Aren't the "normal" grades of
stainless (304 and 316) about 10 x carbon steel?  Best info would come from
a steel distributor.

	-----Original Message-----
	From:	Harold Sprague [SMTP:harold.sprague(--nospam--at)neenan.com]
	Sent:	Tuesday, November 17, 1998 2:36 PM
	To:	'seaint(--nospam--at)seaint.org'
	Subject:	RE: Bronze (One-legged Support) Horse Structure

	Dick,

	Carpenter 20 is a very good choice.  Do you have a ball park idea on
cost.
	The last I knew, it was VERY expensive.

	Regards,
	Harold Sprague
	The Neenan Company
	harold.sprague(--nospam--at)neenan.com


	-----Original Message-----
	From: Horning, Dick/CVO [mailto:dhorning(--nospam--at)CH2M.com]
	Sent: Tuesday, November 17, 1998 3:29 PM
	To: 'seaint(--nospam--at)seaint.org'
	Subject: RE: Bronze (One-legged Support) Horse Structure


	From "Selecting Carpenter Stainless Steels" Copyright 1983 by
Carpenter
	Technology Corp.:

	Type 630 (17 Cr - 4 Ni) is a martensitic stainless w/ good corrosion
	resistance (approaches that of Type 304 for most environments).
Yield
	strength varies from 87 ksi for temper H 1150-M to 183 ksi for H
900.
	Ultimate tensile strength 123 ksi to 198 ksi.  Elongation 22% to 15%
for the
	same respective tempers.  Charpy V-notch toughness 100 to 16 ft-lbs.

		

		-----Original Message-----
		From: John Schwarz [mailto:jschwarz(--nospam--at)theschneidercorp.com]
		Sent: Tuesday, November 17, 1998 1:43 PM
		To: seaint(--nospam--at)seaint.org
		Subject: Re: Bronze (One-legged Support) Horse Structure


		Well, 'tis been an interesting research project.. still in
progress.
	What
		I've learned so far is that stainless steel is the material
of
	choice for
		the support structure.  Neglecting the bronze shell, I need
a 2"
	diameter
		bar to extend through the bent legs into the foundation
(using 304L
		stainless steel.. Fy=35 ksi).

		I've been researching higher strength materials because it
would be
	"nice"
		to get a 1 1/4" diameter bar to work, as it would fit
through the
	leg joints
		without modifying the structure.  Anyone know anything about
AISI
	No. 630
		(commonly called 17-4) precipitation hardened stainless
steel?
	Looks to
		have much higher strength.   It is bendable, weldable,
ductile..  I
	haven't
		been able to locate a good source of this info.

		I appreciate all the responses so far.  You all are quite a
valuable
		resource.


		John Schwarz, P.E.
		The Schneider Corporation
		jschwarz(--nospam--at)theschneidercorp.com