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Re: CHINESE STEEL[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: Rhkratzse(--nospam--at)aol.com
- Subject: Re: CHINESE STEEL
- From: "Gerard Madden, SE" <gmse4603(--nospam--at)gmail.com>
- Date: Wed, 1 Apr 2009 15:39:16 -0700
- Cc: dfisher(--nospam--at)fpse.com, seaint(--nospam--at)seaint.org, dmorris(--nospam--at)bbfm.com
Soil nails and tieback walls use very long thin diameter horizontal drilled shafts to lock in tall retaining walls. With water being present in the soil, you wouldn't want to risk catostrophic wall failure by having corroded steel. We specify double corrosion protection (similar to double secret probation) on shoring systems we design. This system is used on retaining walls taller than 15 feet generally. I have used them on walls as tall as 60 feet.
Wow, what a great List this is! I've been wondering about that purple Korean rebar off and on for 40 years and now I know. Or at least I think I do. But why would someone (presumably) pay extra for corrosion-protected rebar in central Washington (state)?
In a message dated 4/1/09 1:54:52 PM, gmse4603(--nospam--at)gmail.com writes:
Purple rebar is used for tiebacks in shoring. The purple coating is corrosion protection.
On Wed, Apr 1, 2009 at 1:21 PM, David Fisher <dfisher(--nospam--at)fpse.com> wrote:
I was in Santa Barbara last week and I saw CalTrans doing some work on SB 101 Freeway…
All the rebar was purple…!
Whats the deal with that?
Epoxy coating…in the Central Coast?
Great wine, though…
David L. Fisher SE PE
Fisher and Partners - Cayman
372 West Ontario Chicago 60610
75 Fort Street Georgetown Grand Cayman BWI
319 A Street Boston 02210
From: Rhkratzse(--nospam--at)aol.com [mailto:Rhkratzse(--nospam--at)aol.com]
Sent: Wednesday, April 01, 2009 2:15 PM
To: gmse4603(--nospam--at)gmail.com; seaint(--nospam--at)seaint.org
Subject: Re: CHINESE STEEL
You mean like epoxy-coating or galvanizing, or ___?
Not that I recall.
In a message dated 4/1/09 1:13:46 PM, gmse4603(--nospam--at)gmail.com writes:
Did it have corrosion protection?
On Wed, Apr 1, 2009 at 11:58 AM, <Rhkratzse(--nospam--at)aol.com> wrote:
The main thing I remember about Korean steel -- actually rebar -- a long time ago, was that it was distinctly purple.
In a message dated 4/1/09 11:54:16 AM, dmorris(--nospam--at)bbfm.com writes:
I was involved with a similar situation using Korean steel. We were
given the main section parameters (Ix, Sx, Zx, etc) . We weren't given
J and Cw so we had to use the conservative equation for calculating Lr
for calculating the moment capacity under lateral-torsional buckling.
When we were mostly done, we found out that the promised steel strength
of 50 ksi was actually 46 ksi. The other item I remember that there
wasn't the wide suite of sections that you get in North America.
Gary L. Hodgson and Assoc. wrote:
> One of my customers insisted on buying Chinese steel so I had to use
> it. The yield strength is only 34 ksi (for the steel he was using) so
> the savings may not be as good as it looks to the guy just buying on
> price alone. Their W shapes are not the same as North American
> shapes (or European also) so you can't compare them on price per pound
> basis either. The publications (that were given to me) on their steel
> are not as informative as ours, i.e. no J, Z, Cw, just area, mom of
> inertia, section modulus, depth, width and thicknesses.
> Personally, I wouldn't buy any of their stuff based on personal
> experience - too many junky products. Back in the 70's, Hodgson
> Custom Rolling (my brother's company) had a big job rolling a lot of W
> shapes. Every so often one these beams would snap and you could hear
> it in the office 75 ft away. The steel came from Canada, the USA,
> Japan and occasionally Europe - no Chinese steel then. The fewest
> number of breakages were Canadian, then American, then European and
> Japanese. I am sure everybody has improved their steel since then,
> but I suspect that the Chinese steel today would be at end of the
> list. And Canada has stopped making wide flanges.
> Hope this is helpful.
> bill(--nospam--at)polhemus.cc wrote:
>> We've got an overseas job (so "Buy American" isn't an issue) where
>> they're contemplating using structural steel from the Peoples'
>> Republic of China.
>> I'd like to know if anyone has any direct or indirect experience with
>> use of Chinese-made steel. And please, I'm not looking for hearsay
>> (heck, I could contribute that myself), but actual anecdotal evidence
>> of problems (or sucesses) with its use. Specific details would be a
>> I know that a lot of foreign-made steel was problematic in the past,
>> and I also know that the PRC hasn't got the best rep regarding
>> quality control for a wide range of manufactured goods in the very
>> recent past.
>> But what I'm looking for is solid information.
>> Thanks in advance.
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