Alloy sheet and color coated sheet
Hundreds of years ago, metal sheets were used for roofing materials. Since the 1960s, the world’s metallurgical industry has developed rapidly.
Many roof materials are metal. It can produce a variety of metal plates and meet quality requirements and reduce costs.
Metal roofing materials not only include common galvanized steel, stainless steel, aluminum alloy, copper, etc., but also zinc-copper-titanium plywood and pure titanium.
Comparison of aluminum-magnesium-manganese alloy roofing panels and color steel plates：
Aluminum-magnesium-manganese alloy can form an aluminum oxide film with the atmosphere to prevent further corrosion.
The design life of the building is more than 50 years; Colored steel plates are prone to corrosion and rust.
Al-Mg-Mn alloy is light (density is 2730 kg / m2); the color steel plate is heavier (density is 7850 kg / m2).
C.The contrast of strength and rigidity
The aluminum alloy of aluminum-magnesium-manganese alloy contains magnesium and manganese, so it has a certain strength and rigidity.
However, the internal stress, hardening, and strength of aluminum alloy plates have no obvious yield points, which is not as good as that of colored steel;
the strength and stiffness of colored steel plates are relatively good, and they are not easy to deform.
There are two types of aluminum-magnesium-manganese alloy plates: non-painted and painted.
Color steel plates are also available in non-painted and painted.
E.Safety fire protection
The melting point of Al-Mg-Mn alloy is low. Therefore, the high-temperature resistance is poor, and the strength will gradually weaken above 150 degrees.
Because in case of a fire, the fire spreads outward, rather than inwardly and laterally, which helps firefighters stick out the fire hose from the top. And the melting point of the color steel plate is high.