“Material and Substrates”

Substrates

Coated Carbon Steel Hot Dipped Galvanized

G-90 Galvalume

AZ50 AZ55

Aluminum Alloy 3003, 3004, 3105, 5052 Temper, H14, H24, H34

Steel Material Thickness

Example Tolerances:26 Gauge = .016” to .020”24 Gauge = .021” to .027”22 Gauge = .027” to .033”

Material thickness of steel is referred to as Gauge (GA).

Gauge is the two digit number that relates to the thickness of the steel sheet in decimal inches. The larger the Gauge number, the thinner the sheet.

Steel Material Thickness

Material thickness of steel is referred to as Gauge (GA).

Gauge is the two digit number that relates to the thickness of the steel sheet in decimal inches. The larger the Gauge number, the thinner the sheet.

Purchased Thickness:26 Gauge = .018”24 Gauge = .023”22 Gauge = .0296”

Steel Grades

Material grade is determined by “Yield Strength” (Hardness)

Examples: Panel Steel Grade Yield26 Gauge = 50 50KSI26 Gauge = 80 80KSI24 Gauge = 50 50KSI

Trim Steel Grade Yield26 Gauge = 50 50KSI24 Gauge = 50 50KSI

Note: 1,000 PSI = 1 KSI

Hot Dipped Galvanized Defined: Galvanized is 100% melted Zinc applied to steel coil.

“G” stands for Galvanized and last digits stand for the amount of Zinc that is applied to both sides of the steel coil.

Example: G-90 is 0.90 ounces of Zinc per square foot, total both sides.

• Meets ASTM A653-96.• Great Sacrificial Advantages• Hot Dipped Galvanized offers a desirable characteristic with

respect to corrosion by sacrificing itself to protect slit edges and scratches.

• No applicable corrosion warranty• Generally has a smoother surface for paint application

purposes.• Superior Formability.

Galvalume Defined: Galvalume is a combination of 20% melted Zinc and

80% Aluminum that is applied to the steel coil. “AZ” stands for Aluminum and Zinc. The last two digits stand for the coating weight of both sides in ounces per square foot.

Examples: AZ55 is 0.55 oz./sq.ft. (Bare ACG) AZ50 is 0.50 oz./sq.ft. (To Be Painted)

• Aluminum/Zinc Coated Carbon steel sheet that meets ASTM A792-96.

• By volume consists of a minimum thickness of .50 oz per Sq Ft of AL/Zn for both sides of the steel sheet.

• 20 year 6 month warranty against substrate corrosion• 25 year warranty for AZ55 ACG• Great Corrosion Properties• Good Sacrificial Advantages

Galvalume vs. Galvanized

Acrylic Coated Galvalume

Galvanized

Galvalume vs. Galvanized

Hot Dipped Galvanized After 18 years, G-90

Galvanized exhibits red rust

Galvalume Galvalume after 23 years –

No major sign of red rust.

Moderate Marine / Rural

Salt Spray Corrosion Resistance

With cut edges protected, the coating on Galvalume AZ50 lasts 5 to 10 times longer than the coating on G90 Hot Dipped Galvanized.

Salt spray tests conducted with bare cut edges exposed, the corrosion resistance of Galvalume AZ50 is typically three to four times that of G90 HD Galvanized.

Galvalume vs. Galvanized

Salt Spray test concerning the amount of hours to first significant rust

Galvalume

H.D. Galvanized

Unprotected edges Protected edges

3000

2000

2500

1500

1000

500

0

Total # of Hours

Galvalume vs. Galvanized

Corrosion Losses of Substrates

Corrosion Loss (Mils)

Galvalume vs. Galvanized

H. D. Galvanized

Galvanized

0 0.2 0.4 0.6 0.8 1

Dissimilar Metals

Copper Iron Graphite Lead

Direct contact of steel to these metals will cause corrosion damage and deterioration of the steel. Even water run off from these metal will cause corrosion of the steel.

Aluminum

• Conforms to ASTM B209-96.

• Either: − From ingot.− From recycled scrap content.

• Advantages: − Light in weight.− Highly resistant to corrosion.− Excellent reflector of light and heat.− Highly workable and easy to form.

Aluminum

• Two Types of Alloys: Cast and Wrought− Cast have low melting points and tensile strength. Wrought have

high tensile strengths and are 85% of aluminum usage.

• Standard Alloys for Roofing and Cladding; − 3003,3004 alloy corrosion resistance and formability are

excellent.− 3105 alloy is an essentially 98% pure aluminum− 5052 alloy is excellent and in the annealed condition it offers

higher strengths than 3003/3004/3105 alloys.

Aluminum

The International Alloy Designation System is the most widely accepted naming scheme for wrought alloys. Each alloy is given a four-digit number, where the first digit indicates the major alloying elements.−1000 series are essentially pure aluminum.−2000 series are alloyed with copper.−3000 series are alloyed with manganese, and can be work-hardened.−4000 series are alloyed with silicon. −5000 series are alloyed with magnesium.−6000 series are alloyed with magnesium and silicon.−7000 series are alloyed with zinc, and can be precipitation hardened to the highest strengths of any aluminum alloy.−8000 series is a category used for lithium alloys.

Aluminum

• Thickness;− .032” , .040” , or .050”

• Tempers;− H 14, H 24, or H 34 for roofing product.

• H1 Strain hardened without thermal treatment.• H2 Strain hardened and partially annealed.• H3 Strain hardened by low temperature heating.

• A second digit denotes the degree of hardness.− HX2 = 1/4 hard− HX4 = 1/2 hard− HX6 = 3/4 hard− HX8 = full hard− HX9 = extra hard