Steel Doors & Frames - Fleming Door Products

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STEEL DOOR FRAMES
For galvanneal and galvanized steel, the cold-rolled coil is processed through a
Galvanizing Mill. It is uncoiled, degreased and run into a continuous hot-dip zinc coating
bath. For galvanized steel the free zinc is removed by a series of mechanical wipers. For
galvanneal, the excess molten zinc is removed using air knives. The galvanneal coil enters
an annealing furnace and heat converts the zinc coating to a zinc-iron alloy. Next the
galvanneal goes through a passivation wash to retard storage stain. Finally both
galvanized and galvanneal steels are recoiled or slit into sheet stock.
DECOILER
ASTM A1008
Cold Rolled Steel
DEGREASER
CLEANER
ANNEALING
FURNACE
HOT DIP ZINC BATH
(Zinc, Nickle, Chromium &
Copper)
COOLING TOWER
PASSIVATION TANK
Figure 3 : Galvanizing Mill Process
OILER
(Shut Off)
OILER
(Shut Off)
RECOILER
ASTM A924/A653
Galvanneal Steel
To
Steel Service Center
A relative comparison of the coatings and protection provided by them can be easily see in
Figure 4, below.
ASTM STANDARDS FOR STEEL
Figure 4 : CRS vs Galvanneal vs Galvanized Steel
The process of steel making is a highly sophisticated one, relying on leading edge
technology and is covered by a multitude of ASTM Standards. ASTM Standards for steel
have evolved drastically over the past few years. The changes reflect the availability of
steels with improved base metal characteristics, as well as terminology revisions that are
intended to provide a better understanding of steel sheet formability for hot-dip products.
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2
Date
Mar ‘05