Detailed introduction of G550 steel for light steel villa construction

In order to let everyone popularize knowledge and learn more, today I will introduce the performance of G550 galvanized steel in all aspects.

The specific meaning of S550GD+AZ150:

S550GD+AZ150 is referred to as G550, which is a complete grade of aluminum-zinc plating. A stands for aluminum, Z stands for zinc, together it is galvanized, the latter 150 represents the thickness of the zinc layer per square, and 150 is 150 grams per square.

Light steel villa material: C-shaped light steel structure building is mainly formed by cold bending of light steel sheet through equipment, and the skeleton of the house is composed of light steel structure building, which is referred to as light steel structure house or light steel villa for short. The strength of steel refers to the hardness of the steel. The higher the value, the stronger the strength. The strength is also referred to as the yield strength. Sometimes, the higher the strength, the better. , high-strength steel will be an exception!

The steel is G235G345G550 steel, and the international standard is mostly G550 steel. Light steel coating is divided into two types: galvanized and galvanized:

Galvanized: The content depends mainly on the value. Light steel villas generally use 275 grams and 300 grams of zinc. The value is the content of one square of zinc. The higher the content, the thicker the zinc layer.

Physical changes of galvanizing: galvanizing will react with oxygen in the air when exposed all the year round, and the surface will turn black.

Aluminum-zinc plating: referred to as AZ150, aluminum-zinc plating is 2-6 times more anti-corrosion than galvanizing, and the long-term exposed surface of aluminum-zinc keel has no color change. The external chemical substances are separated from the keel to protect the main material of the keel and prevent rust.

The common mechanical properties and physical parameters of G550 galvanized zinc are as follows:

Name Yield Strength Elastic Modulus Bulk Density Thermal Expansion Coefficient

G550 550Mpa 2.06X105 N/mm 2 7.85g/cm 3 1.2×10-5℃

The corrosion resistance of 'galvanized steel coil' comes from the barrier protection function of aluminum and the sacrificial protection function of zinc. When zinc acts as a sacrificial protection on the cut edges, scratches and coating scratches, aluminum forms an insoluble oxide layer and plays a protective role as a barrier. Aluminum-zinc alloy steel coils have been exposed to outdoor exposure tests for more than 20 years in various atmospheric environments, and it has been confirmed that the edge protection function of aluminum-zinc-coated steel sheets is much better than that of galvanized steel sheets.

The hot-dip galvanized steel sheet is a pre-coated steel sheet obtained by hot-dipping a layer of Al-Zn coating on both sides of a cold-rolled steel sheet with various strength and thickness specifications as the base material. The mass percentage of the coating composition is about 55% Al ( Aluminum), 43.5% Zn (zinc), 1.5% Si (silicon), which combines the physical protection and high durability of Al and the electrochemical protection characteristics of Zn. The material has the strength and plasticity of substrate steel and the corrosion resistance of coating. It can protect the inside of the metal matrix from being corroded. In addition, it has a highly decorative bright silver-gray color and regular patterns on the surface, and has a sense of embossing.

G550+AZ150 performance introduction:

1. Heat resistance:

The heat resistance of galvanized steel sheet is better than that of galvanized steel sheet, and it is resistant to high temperature oxidation.

2. Reflectivity:

Galvalume has a high degree of reflectivity, making it a heat-resistant barrier; it is almost twice as reflective as galvanized, making it energy efficient to use as the main structure of a house under normal conditions.

Galvanized steel plate test:

Coated Steel Plate Comparative Tests in Industrial Area of ​​Pennsylvania, USA:

The galvanized steel plate has no rust after 30 years. The low-rise cold-formed thin-walled steel building has the main steel structure sealed in the wall, so the main structure can be used for more than 100 years.

quality assurance:

1. Processability: meet the processing requirements of rolling, stamping, bending and other forms.

2. Corrosion resistance (compared with hot-dip galvanizing): hot-dip galvanized steel has excellent corrosion resistance, and its service life is 2-6 times that of ordinary galvanized steel with the same coating thickness.

3. Reflectivity: The ability to reflect heat and light is twice that of hot-dip galvanized steel, and the reflectivity is greater than 0.70, which is better than 0.65 specified by EPA Energy Star (US Environmental Protection Agency Energy Star), and is an ideal energy-saving building material.

4. Heat resistance: ordinary hot-dip galvanized products are usually used at a temperature not exceeding 230 °C, and will change color at 250 °C, while the galvanized sheet can be used for a long time at 315 °C without changing color. Baosteel's heat-resistant passivation-treated galvanized steel sheet has less color change than that of aluminum sheet and aluminized sheet at 300°C for 120 hours.