Lightweight Steel Roof Frame

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Mild steel is high quality steel that is light and thin, but its strength is not inferior to conventional steel. There are several types of mild steel which are grouped based on tensile strength values. The ability of tensile stress is generally based on the final function of the mild steel.

For example for structural products such as lightweight steel roof truss with high tensile stress (G550). However, for a variety of home appliances products, light steel with lower tensile stress (G300, G250) is needed which is more flexible and soft so that it is more easily formed as desired.

In general, the mild steel raw material is high quality steel with a high tensile strength standard of 550 Mpa (5500 kg / cm2). This strength is the basic element for the mild tensile strength of steel today. With a minimum strength of G550, the mild steel has a minimum melting strength of 550 Mpa. It is proven in laboratory tests that it is not permissible to break when pulled at 500 Mpa. In addition, the steel also has a sliding modulus of 80,000 Mpa and an elastic modulus of 200,000 Mpa.

Although it is lighter and thinner than conventional steel, with a tensile strength of 550 Mpa mild steel can be used as a mainstay to support the load structure of the building. For non-structural functions such as roof cover, G300 quality mild steel is used.

What about the thickness of mild steel? In the general market the thickness ranges from 0.20 - 2.00 mm. This variation in thickness is determined by the function, how much the load is supported and the size of the steel span itself. Smaller thickness compared to conventional steel aims to reduce the burden of building structures.

Mild steel horses have thicknesses between 0.45 - 1.00 mm. Unlike the columns that will support a larger load, the thickness is between 1.00 - 2.00 mm (profile C). Whereas for metal tile the thickness is 0.20 mm because it can be said that it does not carry the load, with that thickness is sufficient.

Steel is composed of iron and carbon (Fe and C). If the element mixes with water and the air will emerge a reaction that encourages rust. So mild steel needs to be coated with stainless steel. The application of anti-rust coating is very important to keep the material durable and durable.

To protect high quality steel material from corrosion, adequate coatings must be provided. Various methods for providing a protective coating to prevent corrosion of high quality steel have been developed.

The type of coating on lightweight steel frames that is circulating in the market is Galvanized, Galvalume, or often also referred to as zincalume and a producer of mild steel products issued by adding magnesium which came to be known as ZAM, developed since 1985, using a protective layer consisting of: 96% zinc , 6% aluminum, and 3% magnesium. Coating thickness in mild steel in the market varies depending on each manufacturer.