The following specifications apply to all our steel products presented in this catalogue unless otherwise indicated.

 

Steel Specifications

All United Metal Sections’ profiles conform to the finest steel standards accepted by the ASTM.

 

United Metal Sections steel profiles have minimum yield strength of 230 Mpa (33,000 psi) according

to ASTM A446-83, Grade A steel.

 

The actual steel thickness used in United Metal Sections’ profiles may differ from the thickness specified

in this catalogue by a maximum of 0.05 mm.

 

Most of United Metal Sections products can be manufactured in any gauge, as required by the customer.

However common gauges are:

 

Thickness

   (mm)          (inch)

Nearest U.S. Gauge Number

0.45

0.020

26

0.50

0.024

25

0.60

0.028

23

1.0

0.039

19

1.2

0.047

18

 

Corrosion Resistance

According to the ASTM standards the minimum zinc coating requirements for load-bearing steel profiles is G60 / Z180.

 

However, at United Metal Sections we are proud to exceed these requirements since we insist on making our profiles from G90 / Z275. This results in more durable quality products. The following table shows the United Metal Sections advantage:

  

Coating

Code

Mass

g/ m2

Zinc Thickness

Notes

G60 Z180

180

12.7 (microns)

Recommended by  ASTM

G90 Z275

275

19.4

(microns)

Used by United Metal Sections

 

Durability

With the adoption of heavier zinc coatings on galvanized steel, United Metal Sections products provide superior durability. This is particularly important in aggressive environments such as humid coastal regions. This makes United Metal Sections the preferred supplier of steel framing products in the Gulf region.

 

You may refer to “Improving the Durability of Steel Framing” section in this catalogue for additional information on this topic. 

Fire Resistance

Building codes require steel framing to have a fire resistance rating based on ASTM standard E119. Since United Metal Sections follows the ASTM standards for materials, coatings and manufacturing, we can confirm that our products meet the E119 standard when used, as recommended in the applications notes sections of this catalogue.

 

Standards

Our profiles meet the following standards:

ASTM C645-00, ASTM A924M-95, ASTM A 653M-95, BS 2989: 1982 and BS 2994: 1976.