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Galvanized Steel Ducts

MasterFormat 23 31 00 HVAC Ducts and Casings; 23 31 13 Metal Ducts

This information reflects our best understanding of product composition in 2015.

Galvanized steel ducts are the most frequently used duct material for heating, ventilation, and air conditioning (HVAC) systems in commercial and institutional buildings. Galvanized steel ducts may come in round, rectangular, or oval shapes of...

More about Galvanized Steel Ducts

Galvanized steel ducts are the most frequently used duct material for heating, ventilation, and air conditioning (HVAC) systems in commercial and institutional buildings. Galvanized steel ducts may come in round, rectangular, or oval shapes of varying sizes depending upon the application. Galvanized coatings are applied to steel sheets through a hot dip in a 99% pure zinc bath, which reacts with the steel sheet surface to form a coating which protects the steel from corrosion. The HVAC Duct Construction Standards for metal and flexible state that duct work will conform to ASTM A653 and ASTM924 standards for G-60 coated galvanized steel of lockforming grade (also known as commercial steel (CS)), unless otherwise specified. When a CS type is not specified, ASTM A653 recommends furnishing to CS type B. The G in G60 refers to the galvanized (zinc) coating, while the number refers to the weight of zinc on the surface of the steel in inch-pound units. The most commonly used galvanized duct work conforms to G60 or G90. G60 is used commonly for dry indoor ducts while G90 is the minimum requirement for use in any outdoor exposure or wet indoor application. Therefore, most specifications refer to galvanized steel conforming to G90 standards. Ductwork is typically available in 18-28 gauge sizes, but gauges 22-28, especially 26, appear to be the most commonly used. Therefore, this CP describes a 26 gauge G90 galvanzied steel duct conforming to ASTM A653.

Name % Weight Whole Function GREENSCREEN® Sources
Iron, elemental
7439-89-6
92.25% base metal Subscribe to view
Manganese
7439-96-5
0.56% alloying element Subscribe to view
Copper
7440-50-8
0.23% alloying element Subscribe to view
Nickel
7440-02-0
0.19% alloying element Subscribe to view
Chromium
7440-47-3
0.14% alloying element Subscribe to view
Carbon
7440-44-0
0.08% alloying element Subscribe to view
MOLYBDENUM
7439-98-7
0.06% alloying element Subscribe to view
Sulfur, precipitated
7704-34-9
0.03% alloying element Subscribe to view
Titanium
7440-32-6
0.02% alloying element Subscribe to view
PHOSPHORUS
7723-14-0
0.03% alloying element Subscribe to view
Vanadium, elemental
7440-62-2
0.01% alloying element Subscribe to view
Niobium
7440-03-1
0.01% alloying element Subscribe to view
Zinc, elemental
7440-66-6
6.38% coating element Subscribe to view
Aluminum
7429-90-5
0.01% adhesion promotion Subscribe to view
Name % Weight Part % Weight Whole Function GREENSCREEN® Sources
ASTM A653 CS Type B Steel
93.61% 93.61% base steel Subscribe to view
Iron, elemental
7439-89-6
(Nested within ASTM A653 CS Type B Steel)
98.55% 92.25% base metal Subscribe to view
Manganese
7439-96-5
(Nested within ASTM A653 CS Type B Steel)
0.60% 0.56% alloying element Subscribe to view
Copper
7440-50-8
(Nested within ASTM A653 CS Type B Steel)
0.25% 0.23% alloying element Subscribe to view
Nickel
7440-02-0
(Nested within ASTM A653 CS Type B Steel)
0.20% 0.19% alloying element Subscribe to view
Chromium
7440-47-3
(Nested within ASTM A653 CS Type B Steel)
0.15% 0.14% alloying element Subscribe to view
Carbon
7440-44-0
(Nested within ASTM A653 CS Type B Steel)
0.09% 0.08% alloying element Subscribe to view
MOLYBDENUM
7439-98-7
(Nested within ASTM A653 CS Type B Steel)
0.06% 0.06% alloying element Subscribe to view
Sulfur, precipitated
7704-34-9
(Nested within ASTM A653 CS Type B Steel)
0.04% 0.03% alloying element Subscribe to view
Titanium
7440-32-6
(Nested within ASTM A653 CS Type B Steel)
0.03% 0.02% alloying element Subscribe to view
PHOSPHORUS
7723-14-0
(Nested within ASTM A653 CS Type B Steel)
0.03% 0.03% alloying element Subscribe to view
Vanadium, elemental
7440-62-2
(Nested within ASTM A653 CS Type B Steel)
0.01% 0.01% alloying element Subscribe to view
Niobium
7440-03-1
(Nested within ASTM A653 CS Type B Steel)
0.01% 0.01% alloying element Subscribe to view
Galvanized Coating (G90)
6.39% 6.39% coating Subscribe to view
Zinc, elemental
7440-66-6
(Nested within Galvanized Coating (G90))
99.85% 6.38% coating element Subscribe to view
Aluminum
7429-90-5
(Nested within Galvanized Coating (G90))
0.15% 0.01% adhesion promotion Subscribe to view

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CASRN NAME GREENSCREEN® TYPE FREQUENCY % Weight Chemical % Weight Product SOURCE
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Sources

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Source Uploaded Document Linked Document
AKSteel
ArcelorMittal MSDS
ASTM A653
Ductmate
Steel Dynamics MSDS
Versus