| Properties of the Base Steel |
U. S. Steel ACRYLUME® steel sheet is available in the same steel
designations as GALVALUME® steel sheet.
- Commercial Steel
(CS)
- Forming Steel
(FS)
- Drawing Steel
(DS)
- High Temperature
Steel (HTS)
- Structural Steel
(SS)
|
ASTM References
These designations
are defined in ASTM Specification A792. The following two tables
provide details about the strength levels and formability
attributes for these designations as presented in ASTM
A792.
|
Typical Ranges of
Mechanical Properties*
|
| |
Yield
Strength
|
Elongation
|
R
|
N
|
|
Designation
|
|
in 2 in,
%
|
Value
|
Value
|
|
CS Type B
|
|
>/= 20
|
A
|
A
|
|
FS
|
|
>/= 24
|
1.0/1.4
|
0.16/0.20
|
|
DS
|
|
>/= 30
|
1.3/1.7
|
0.18/0.22
|
|
HTS
|
|
>/= 15
|
A
|
A
|
|
|
*The typical mechanical
property values presented in this table are nonmandatory. They are
intended to provide the purchaser with as much information as
possible to make an informed decision on the steel to be specified.
Values outside of these ranges may occur.
A - No
typical properties have been established.
|
Structural Steel
Mechanical
Property Requirements
|
|
Grade
|
Yield
Strength
Minimum, ksi
|
Tensile
Strength
Minimum, ksi
|
Elongation
in 2 inches, min.
|
|
33
|
33
|
45
|
20
|
|
37
|
37
|
52
|
18
|
|
40
|
40
|
55
|
16
|
|
50 Class 1
|
50
|
65
|
12
|
|
50 Class 2
|
50
|
.....
|
12
|
|
80 A
|
80B
|
82
|
.....
|
|
|
Where an ellipsis
(....) appears in the table, there is no
requirement.
A - For sheet thicknesses of 0.028 and thinner,
no tension test is required if the hardness result is Rockwell B 85
or greater.
B - As there is no discontinuous yield curve, the yield strength
should be taken as the stress at 0.5% elongation under load or 0.2%
offset.
Coating Thickness
The coating weight categories for the metallic coating
are the same as those for the GALVALUME® steel sheet. The use of AZ55
or AZ50 should be decided on the same basis for regular GALVALUME® Steel sheet.
Surface Finish
The surface
finish of ACRYLUME® steel sheet is basically unchanged from the typical appearance of the
GALVALUME® coating since the acrylic film is clear. If anything, the
appearance is somewhat satiny (less metallic gloss) especially when
viewed at an oblique angle. The GALVALUME® steel sheet is typically not temper rolled prior to
applying the acrylic film; thus, the normal small-spangle finish of
GALVALUME® steel sheet is visible.
Surface Treatment
The acrylic coating on ACRYLUME® steel sheet does not require the use of
any other surface treatment. The acrylic film offers the combined
benefit of high resistance to storage staining and the lubricating
effect of oil. The product is specifically not intended to be oiled
when used for roofing, siding and decking. The absence of an oil provides improved worker safety.
ACRYLUME® steel sheet is only available with no additional surface
treatments.
Corrosion Performance
The results of accelerated-corrosion tests show the superiority
of ACRYLUME® steel sheet when compared with today's conventional
chemically-treated GALVALUME®.
|
Wet Stack
Test
- Designed to simulate storage of
sheets in either a coil form or as a stacked bundle at the
jobsite.
- Test samples stacked tightly in
a bundle. Wetted between the individual panels every 2 days with
deionized water.
- Tested at 100°F for 750 hours.
|
|
Hours in
Test
|
ACRYLUME®
|
CT
1*
|
CT
2*
|
|
250
|
Light haze
|
Light surface spots
|
Dark black spots &
edges
|
|
500
|
Light haze
|
Light surface patches
|
Heavy black patches
|
|
750
|
Light haze
|
Uniform surface
darkening
|
Heavy, dark black
patches
|
|
|
|
|
Water Immersion
Test
- Designed to stimulate ponding
of water on a low slope roof
- Samples immersed in deionized
water.
- Water temperature --
100oF.
|
|
Hours in
Test
|
ACRYLUME®
|
CT
1*
|
CT
2*
|
|
500
|
Slight dulling
|
Initial dark spots
|
Dark patches
|
|
1000
|
White patches with dark
edges
|
Dark & light
stains
|
Completely blackened
|
|
2000
|
White surface, dark
edges
|
Dark stains
|
Completely blackened
|
|
|
|
|
Salt Spray
Test
- Tested per ASTM
B117.
- 5% salt solution.
- 30-day test duration.
|
|
Time in
Test
|
ACRYLUME®
|
CT
1*
|
CT
2*
|
|
250 Hours
|
No activity
|
White haze with small black
spots
|
White haze with small black
spots
|
|
500 Hours
|
Tiny spots, evidence of initial
activity
|
White haze with black
streaks
|
Uniform haze with black
streaks
|
|
720 Hours
|
Small spots with local light
streaks
|
Light haze with dark
spots
|
Dark haze with dark
spots
|
|
|
|
|
*CT 1 and CT 2 are two different conventional
chemical treatments.
ACRYLUME® is a registered trademark of United
States Steel.
GALVALUME® is a registered trademark of BIEC International,
Inc.
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