As we all know, the steel structure of light steel villas has high strength, is lightweight, good seismic performance, low foundation cost, large building use area, high building quality, suitable for industrialized and standardized production, dry green construction, and suitable for different climatic conditions, not affected by the construction season, low overall cost, etc. At the same time, the steel structure can also reduce the pollution of construction waste to the environment and can be recycled in the whole life cycle, so it is called the main representative of green buildings. The economic development director of my country’s energy saving and emission reduction.

 

The designer especially emphasizes that the light steel structure house will guide natural light into the whole building, which can also save a lot of electricity costs for future lighting, and use a large number of floor-to-ceiling doors and windows. When winter comes, bright and mild sunlight enters, allowing you to I feel that the interior of the house is very bright and warm; when summer comes, open the doors and windows to reduce the use of air conditioning through natural ventilation. In this way, your living expenses will be reduced a lot. At the same time, visually, because of the penetrating space planning, the light steel villa introduces the beautiful scenery outside, so that people in the light steel structure house can feel the open space and feel happy. .

 

Q235-B steel or Q345-B steel is generally used, and Q345-A steel is also used, with a thickness of t≤2mm and a galvanized layer of z180 low-rise cold-formed thin-walled steel for residential buildings. ,

The Australian standard mostly uses LQ550 steel strip (G550 steel) for cold bending forming, thickness 0.6<t≤1.5mm, galvanized AZ150

The American standard mostly adopts Q235 grade, Q345 steel strip cold-formed, thickness 0.8＜t≤2mm, galvanized layer Z275

 

Galvalume/GL is currently the steel plate with the best metal coating ratio for corrosion resistance. The aluminum-zinc alloy structure of the galvanized steel plate is composed of 55% aluminum, 43.4% zinc and 1.6% silicon solidified at a high temperature of 600 ° C. The entire structure is composed of aluminum-iron-silicon-zinc to form a dense quaternary crystal. Thus forming a strong and effective barrier to prevent the penetration of corrosive factors.

The common mechanical properties and physical parameters of LQ550 galvanized coating are as follows

name

Yield Strength

Elastic Modulus

Density

Thermal expansion coefficient

LQ550

550Mpa

2.06X105 N/mm2

7.85g/cm3

1.2×10-5℃

 

The corrosion resistance of “55% Al-Zn-plated steel coil” comes from the barrier protection function of aluminum and the sacrificial protection function of zinc. While zinc sacrificially protects cut edges, scratches, and scratches on the coating, aluminum forms an insoluble oxide layer that acts as a protective barrier. Al-Zn alloy steel coils have been subjected to more than 20 years of outdoor exposure tests in various atmospheric environments, and it has been confirmed that the edge protection function of 55% Al-Zn-coated steel sheets is better than that of galvanized steel sheets and 5% Al-Zn-coated steel sheets. good.

The hot-dip galvanized steel sheet is a pre-coated steel sheet obtained by hot-dip a layer of Al-Zn coating on both sides of the cold-rolled steel sheet with various strengths and thickness specifications. The mass percentage of the coating composition is about 55% Al, 43.5% zinc, 1.5% Si, combining the physical protection and high durability of Al and the electrochemical protection characteristics of Zn, the material has the strength and plasticity of the substrate steel, and the corrosion resistance of the coating, which can protect the metal matrix from corrosion. Corroded again, in addition, the surface has a highly decorative bright silver-gray luster and regular patterns, and has a sense of embossment.

Product use and selection:

DC51D+AZ150

S300GD+AZ150

S350GD+AZ150

S550GD+AZ150

G550+AZ150

 

Performance introduction:

Heat resistance:

The heat resistance of the 55% aluminum-zinc alloy plated steel plate is better than that of the galvanized steel plate, and is similar to the high temperature oxidation resistance of the aluminum plated steel plate. Aluminum-zinc alloy steel plate can be used in high temperature environment up to 315 degrees.

Reflexivity:

55% galvalume plated steel is highly reflective, making it a barrier against heat; galvalume is almost twice as reflective as galvanized steel and therefore acts as a roof and inlay when unpainted. The board can also achieve energy saving effect.

 

Paintability:

Due to the excellent adhesion between the zinc layer of the galvanized steel sheet and the paint, it can be painted without pretreatment and weathering treatment when it is used as a sign board for general purposes; while the galvanized steel sheet needs weathering treatment and pretreatment .

The comparative test of coated steel plates carried out in the industrial area of Bethlehem, Pennsylvania, USA, the following results can be obtained:

After 20 years, the 55% Al-Zn alloy plated steel plate has no rust marks, but the corresponding galvanized steel plate has about 10 years, 4% Al-Zn plated steel plate for 10 years, and 7% Al-Zn plated steel plate for about 9 years.

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

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

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 stipulated by EPA Energy Star (Energy Star of the US Environmental Protection Agency). It is an ideal energy-saving building material.

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 galvanized sheets can be used at 315°C for a long time without discoloration. Baosteel’s heat-resistant passivation-treated galvanized steel plate has a smaller color change than that of aluminum plate and aluminum-plated steel plate at 300°C for 120 hours.

Galvalume Quality Commitment:

1: According to relevant ASTM standards, the degree of pulverization of galvanized steel sheets (strips) will not exceed grade 6 within 10 years.

2: There will be no cracks visible to the naked eye within 5 years of processing.

3: Corrosion and perforation will not occur within 20 years