Steel doors and windows are divided into two categories: ordinary steel doors and windows and painted galvanized steel doors and windows.
(A) ordinary steel doors and windows
Ordinary steel doors and windows, referred to as "steel doors and windows", are also divided into solid steel doors and windows and fasting steel doors and windows.
(1) Solid steel doors and windows. Real steel doors and windows are made of low-carbon steel hot-rolled into a variety of profiles, and then made by the process of cutting, punching, welding and assembly with accessories. The exposed metal surface of solid steel doors and windows is easy to paint (paint), so the corrosion resistance is good, but the amount of steel used is heavy, heavy and uneconomical. Solid-bellied steel doors and windows are generally suitable for general industrial buildings, auxiliary production buildings and residential residential buildings.
(2) Fast steel doors and windows. Fasting steel doors and windows are cold-rolled strip steel welded by high-frequency welded pipe units into various profiles, and then made by cutting, milling, welding, drilling, assembly and other processes. The material of empty steel doors and windows is hollow core material, and the surface of the core space is not easy to paint (paint), so the corrosion resistance is not as good as that of solid steel doors and windows, but the amount of steel is small, light weight, and high rigidity.
It should be pointed out that one of the disadvantages of ordinary steel doors and windows is poor corrosion resistance. In recent years, the popularization and application of powder electrostatic spray process technology has opened up an effective way for the rust and corrosion protection of steel doors and windows. At the same time, it should also be pointed out that steel doors and windows have poor airtightness and watertightness, thermal conductivity is relatively large, and heat loss during use is high. Therefore, ordinary steel doors and windows can only be used for general buildings, but are rarely used on higher-grade buildings, especially buildings with air-conditioning equipment.
(B) Color galvanized steel doors and windows
Painted galvanized steel doors and windows, also known as "color plate steel doors and windows", "galvanized color plate doors and windows", is a new type of metal doors and windows. It is an assembled metal door and window created by Italian company Seco in the 1970s. It is now widely used in more than 30 countries and regions in the world. Some manufacturers in China have introduced this kind of door and window production line from 1986 to 1987. Since 1988, they have started to put on the market. At present, more and more applications have been obtained.
Painted galvanized steel doors and windows are painted galvanized steel and 4mm thick flat glass or double hollow glass as the main material, made by mechanical processing, colors are red, green, white, brown, blue and so on. The four corners of the door and window are plugged with connectors, the gap between the glass and the door and window, and the gap between the door and window frame and the fan are all sealed with rubber sealing strips and sealant.
Painted galvanized steel doors and windows of the production process completely abandon the high energy consumption of the welding process, all using plug-assembly angle self-tapping screw connection. The coating of doors and windows has good anti-corrosion performance and solves the problem that ordinary steel doors and windows have not solved good anti-corrosion problems for a long time; door and window glass is made of 4mm thick flat glass, especially made of insulating glass, and has good thermal insulation and sound insulation properties. Outdoor -40 °C, indoor glass is still not frost. In addition, the decorative galvanized steel doors and windows have good decorativeness, airtightness, waterproofness, and durability.
In summary, galvanized steel doors and windows with light weight, high strength, large lighting area, dust, waterproof, sound insulation, thermal insulation, sealing performance, beautiful shape, bright colors, uniform texture, soft, decorative, and resistant Corrosion and other features. No maintenance is needed during use, which solves the problems of common steel doors and windows that consume much material, are easy to corrode, have sound insulation, sealing, and poor insulation properties.
Painted galvanized steel doors and windows are suitable for doors, windows, and doors in shops, supermarkets, laboratories, school buildings, high-grade hotel hostels, various theatre theaters, and residential high-rise buildings.
According to the different structures, the galvanized steel doors and windows are divided into two types: sub-frames and sub-frames. With sub-frame painting galvanized steel doors and windows apply to the outer wall of marble, glass mosaic, ceramic tile, all kinds of tiles and other materials, or doors and windows and interior wall surface need to be flush with the building; without sub-box painting galvanized steel doors and windows Applicable to buildings that are normally painted outdoors, doors and windows are directly connected to the wall, but the shape of the plaster must be accurately measured.
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