Weathering steel poles - Transmission lines

[demsha]

Hello there,

Is that possible transmission tower line poles fabricated with weathering steel to be corroded?
I have pictures but I don't know how to insert here. I understand that Cu and Cr added into regular steel to make weathering steel.
These poles have large isolated marking on the surface which appears washed away paint.

If this corrosion what are the causes it happens? a quick response would be greatly appreciated.

 

[cloa]

Of course its possible. Weathering steel is first dependant on controlled initial corrosion to setup a protective layer and that layer is not perfect- it can be affected by salt or pooled water. Ctrl+P to insert a picture.

http://en.wikipedia.org/wiki/Weathering_steel

 

[demsha]

Thanks for you quick response Cloa. I would prefer more informtion on this issue. Presently these transmission tower poles are standing vertically in the field. Therer is very slim chance that salt is coming to contact with the pole surface. Crl + P does not work for inserting pictures, it just go to print preference.

 

[cloa]

Click on the picture symbol- its next the little chain in just above your your Reply to This Thread window.

 

[EdStainless]

What happens with these steels is that they must be clean and allowed to start corroding evenly in order to form the protective film.
If these had been mishandled in fabrication, transport, or erection the result could be accelerated localized corrosion.

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Plymouth Tube

 

[metengr]

Most steel towers for electrical transmission and distribution at least in the US are designed and fabricated using a national code or standard. Included in this standard are materials of construction and corrosion protection (if applicable). Most steel towers are either painted or galvanized for corrosion protection, again based on a national standard.

 

[TomDOT]

Please post some photos if you would like more help.

As the esteemed members have mentioned - typical problems are salt or ponded water.

 

[stevenal]

Correction. Using the picture button or ctrl-p does not post your picture, it posts a link to your picture. This works great if your picture is already posted on a publicly accessible site. If this is not the case, use the ...or upload your file to ENGINEERING.com link near the bottom of the page.