Summary for best steel for galvanizing Discussion
Best steel type for galvanizing depends on the mechanical properties you need, not just the coating target. In the thread, S.R. Ameen asks what steel composition should be used to achieve a 127-micron hot-dip galvanized coating on 4 mm hot-rolled steel sheets, with a zinc kettle operating at 445 °C and a bath of special high-grade zinc with about 0.005% aluminum added. The reply from Ted Mooney, P.E. says the key question is what mechanical properties the steel must have, because that will determine the steel type required. In other words, the coating thickness and bath conditions alone are not enough to specify the steel composition. The discussion points readers toward selecting the base steel based on performance requirements first, then matching it to the galvanizing process.
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Q. Dear sir ,
I want to attain a coating of 127 microns on hot rolled steel sheets of 4 mm thickness. Suggest please the steel composition (operating temperature of the zinc kettle- 445 °C, and bath is prepared from special high grade zinc, and aluminium is added up to .005 percent).
S.R. Ameen
Bangalore, Karnataka, India
2002
A. What mechanical properties do you want the steel to have? That will determine the type of steel you need.
Bill Reynolds [deceased]
consultant metallurgist – Ballarat, Victoria, Australia
We sadly relate the news that Bill passed away on Jan. 29, 2010.
“Hot Dip Galvanizing of Steel Structures”
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A. Hi, S.R. Bill is of course right that the purpose of the galvanizing is to add corrosion resistance to the steel — so the tail is sort of wagging the dog if you try to tailor the steel to the needs of the galvanizing process.
But high silicon content is known to reduce galvanizing thickness, so if you want high thickness, you want low silicon steel (see thread 776). You may also wish to see threads 18653, and
48734. Good luck.
Regards,
Ted Mooney, P.E.
Striving to live Aloha
finishing.com – Pine Beach, New Jersey
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