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In China, for the selection of color coated steel plate, users are relatively less concerned about steel grades. Because most of the domestic color coated steel plate production There are few kinds of steel in the plant, most of which are dc51 (because the hot rolled plate or hard rolled coil they purchased is basically a steel type). Some color coated steel plants with hot-dip galvanizing production line produce all hard steel (S550) or high-strength steel (S350, etc.) through hot-dip galvanizing annealing, but it is very difficult because they have no control over the quality and chemical composition of the substrate. Therefore, the quality stability is poor, which leads to large fluctuation of performance, resulting in poor pressure plate.
For buildings, the bearing weight (wind load, snow load, construction personnel and machinery), the span of buildings, the design of purlin distance, etc. all depend on the strength of steel plates. For the color coated and aluminum zinc plated plates for building maintenance structures, there are corresponding standards abroad. For example, astm653 and astm792 in the United States, jisg3302 and jisg3321 in Japan, en10215 and en10147 in Europe, etc. It can be divided into CQ (general commercial grade), DQ (general stamping), HSS (high strength structural steel) and FH (all hard steel) according to the steel categories.
CQ general commercial grade
Nonferrous metal smelters (copper, zinc, aluminum, lead, etc.) are the most challenging for the service life of color coated steel plates. However, reasonable selection of materials, design and environmental protection investment can ensure or improve the service life of color coated steel plate. 10 years of replacement or maintenance should be possible.
DQ for general stamping
Generally, the color plates used in construction are roll forming or composite sandwich, so the stamping performance of materials is not high, so they are rarely used in the construction field (except for some door and window color plates).
HSS high strength structural steel
According to the European standard, HSS can be divided into 4-5 kinds of steel with different strength. However, because the common CQ grade material has been able to replace the low strength HSS steel, the steel with yield strength of 280mpa and 345mpa is widely used in the market. Tste28 and ts350gd produced by Baosteel are the two kinds of steel.
Compared with common CQ, HSS steel has several advantages: (1) because of its low yield strength, it has good fire resistance and seismic resistance. (2) For thicker steel plates, it can be used to make large-span arch plates. (3) For general exterior wall and roof panel type, it can be properly thinner than CQ material, thus saving material consumption.
It is a kind of steel that improves the yield strength of steel plate by controlling annealing temperature. According to the international general standard, the yield strength is ≥ 550MPa, and the tensile strength is ≥ 570Mpa. This kind of material has high strength and low elongation, which is suitable for forming steel plate with shallow plate shape, and can greatly save materials when used. Therefore, countries are competing for the first research and development of this kind of steel. In foreign standards, materials with high strength and good elongation are also described. For example, HSLA (low alloy and high strength) is used to add strengthening alloy elements in steel-making. However, due to the high strength and the limitation of increasing reduction rate when rolling in iron and steel works, HSLA steel is rarely used as thin color coated plate for maintenance structure (another disadvantage is high cost).
According to Baosteel's many years of experience in using steel grades, the guarantee of the final product shape of color coated steel plates is closely related to the strength grade of steel plates, the shape of profiled steel plates and processing machines.
Generally speaking, the more processing passes, the better the shape of the board, the slower the processing speed and the better the shape of the board. For profiled steel plate, the shape of shallow wave plate is better than that of high wave plate. For the strength of steel plate, the trend of shape deterioration after strength processing is more obvious. Another reason for the relatively poor shape of high-strength steel is that many color coating plants only rely on reducing the annealing temperature of hot-dip galvanizing to improve the yield strength of materials, which will lead to the imbalance of mechanical properties in the width direction of steel plate. This imbalance is caused by the uneven temperature of the strip in the whole width direction. The temperature drop may cause the temperature of some parts to be lower than the annealing temperature of the recrystallization of the steel plate.
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