Galvanizing high strength steel bars and rods
Galvanizing high strength steel bars and rods
(OP)
How can one determine whether high strength steel bars and rods can be galvanized without significantly altering the mechanical properties of the steel? Specifically, I'm talking about materials typically used in the prestressing industry with very high tensile strengths (i.e. ASTM A722 bars, Ft=150ksi). I realize that galvanizing is especially difficult when working with quenched and tempered steel, but what about steel that isn’t quenched and tempered? Are there specific guidelines or rules-of-thumb that should be followed when contemplating galvanization for these materials?
Thanks,
Tim
Thanks,
Tim






RE: Galvanizing high strength steel bars and rods
RE: Galvanizing high strength steel bars and rods
I would definately discuss this with a galvanizer. I think, somewhere, AISC says that A325 and A449 material can be hot dipped galvanized, but that A490 material cannot be. I hope I am not mistaken on that. I am not sure about A722.
I might be possible to mechanically galvanize this material istead of hot-dip galvanizing.
Consult with a galvanizer is unsure.
RE: Galvanizing high strength steel bars and rods
RE: Galvanizing high strength steel bars and rods
A good place to start your investigation is:
http://www.galvanizeit.org/
csd
RE: Galvanizing high strength steel bars and rods
ASTM A143/A143M-03
Standard Practice for Safeguarding Against Embrittlement of Hot-Dip Galvanized Structural Steel Products and Procedure for Detecting Embrittlement
RE: Galvanizing high strength steel bars and rods
h
Essentially if you have Fy equal to 150ksi or above (as you do), then galvanizing is not a good option due to hydrogen embrittlement.
Also see Q/A No. 10 on AISC's site:
http://