SS304L Stainless Steel Clad Steel Plate

The thin gauge SS304L Stainless Steel Clad Steel Plate below 3mm are mainly produced by direct cold-rolled composite rolling or cold-rolled composite billets, which are mainly used in elevators, transportation, buildings, bridge decoration, etc. This kind of products were originally made of pure stainless steel, such as 304 (L) and 316 (L), which consumed too much stainless steel resources and cost too much. The use of composite plates can save stainless steel resources and material costs to a certain extent.

3.1.1 Elevator industry

The inner plate of elevator car, car door, hall door, door pocket, skirt plate and inner and outer cover plate of escalator can use stainless steel composite cold-rolled coil to replace the original pure stainless steel cold-rolled coil, which can save 30%~60% of the cost, which will bring great benefits to the development of elevator industry. With the gradual promotion of the elevator installation plan for old residential buildings in Beijing, Shanghai and other first-tier cities and the commencement of high-rise buildings and public facilities, the development of the elevator industry will be further accelerated. As shown in Figure 2, elevators in China in 2000.

The output was 37500 sets, and then showed a steady growth trend. By 2010, the output of elevators in China had increased to 36500 sets, and then increased rapidly at an average annual rate of 15.9%. In 2015, the output reached 760000 sets, calculated according to the average 810kg stainless steel composite plate for each elevator (20 floors for each elevator), The elevator industry needs 620000 tons of stainless steel composite plates every year. It is estimated that by 2020, the output of elevators in China will reach 1.08 million, and the demand for stainless steel composite plates for elevators will reach 870000 tons. 3.1.2 The stainless steel panel and cover plate of smoke exhauster are clean and beautiful, easy to maintain, and are increasingly popular in the market. Stainless steel composite plate.

It has great advantages in cost and material processing, and has huge market space in the industry. As shown in Figure 3, the number of cigarette smoke exhausters in China was 10.899 million in 2006, and then increased rapidly to 21.067 million in 2012 at an average annual rate of 12%. From 2014 to 2016, the growth rate of cigarette smoke exhausters slowed down due to the impact of real estate regulation, and the average annual output reached about 29.10 million, based on 14 kg stainless steel composite plates for each cigarette smoke exhauster, The estimated annual demand is 400000 tons. With the promotion of China's urbanization construction and the continuous growth of the urbanization population, the market demand for range hoods will also continue to grow, which will certainly drive the large demand for stainless steel composite plates Increase by.

3.1.3 Building decoration

In high-grade buildings, the requirements for the functionality, decoration and craftsmanship of door and window materials are high. Cold rolled SS304L Stainless Steel Clad Steel Plate will be the preferred materials for high-rise buildings and coastal buildings in the future. Stainless steel doors and windows have higher wind load strength, thermal insulation and corrosion resistance than aluminum alloy doors and windows, but the elastic modulus of stainless steel is higher, the residual deformation is large in the rolling process, and the dimensional accuracy is difficult to control. Because of the ingenious design of carbon steel base plate and composite material, the stainless composite steel plate has good deep processing performance. It is the most promising new high-grade door and window material, and has been favored by material selectors in the construction industry. It is estimated that the demand will be more than 500000 tons in 2020.

Figure 3 Annual output of smoke exhausters in China

In addition, the curtain wall in high-rise and high-grade buildings is the key to improve the external decoration of buildings and enrich the urban landscape. The composite stainless steel has excellent decorative effect through surface wire drawing and engraving. It is elegant, bright, eye-catching, safe and reliable. It is incomparable to aluminum alloy plate, galvanized plate and color coated plate, and has become the trend of architectural decoration in China. The 220000m2 roof of Qingdao New Airport Terminal newly built in 2017 is all assembled with stainless steel, which not only has strong corrosion resistance, but also has a great impact on the coastal high salt and humidity environment

It has strong adaptability, its service life is far longer than that of aluminum alloy roof and aluminum zinc plated steel plate roof, and its maintenance cost is low and its comprehensive cost performance is high. At present, the installation of curtain wall in China will reach more than 6 million m2 every year, and the annual demand will reach more than 70000 t if the stainless steel composite plate is 12 kg per square meter. With the gradual promotion of the application of metal curtain wall, this demand will grow steadily.

3.1.4 Carriage structure

Stainless steel is used more and more in railway trains, subways, buses and other vehicles, mainly due to its corrosion resistance, fatigue strength, high-temperature resistance and fire resistance, and lightweight and safety performance compared with aluminum alloy and carbon.

Steel has obvious advantages, and the coating process is omitted in the manufacturing process, which basically saves the subsequent maintenance costs. It is a relatively economical car body material at present. In 2016, the operating mileage of China's high-speed railway reached 22000 km, the operating mileage of urban subway was 2764 km, and the number of train vehicles reached about 51000, while the number of pure stainless steel vehicles accounted for only about 3.4%, and the stainless steel steel consumption was about 16000 tons. Considering the factors such as the upgrading of new railways, urban subways, and ordinary passenger trains, stainless steel composite plates are in the market.

The stainless steel composite plate has obvious advantages. The thin gauge stainless steel composite plate of less than 3mm can basically replace the existing application field of pure stainless steel. In 2016, China's total stainless steel production capacity has exceeded 40 million tons.

It accounts for 61% of the total stainless steel production capacity in the world. The actual output of crude steel has reached 24.938 million tons (of which, the proportion of plates accounts for more than 90% and that of long products is less than 10%), the apparent consumption has reached 18.835 million tons, and the import volume has reached 730000 tons (mainly stainless steel cold-rolled sheet and strip, hot rolled medium thick and wide sheet and strip, respectively 182000 tons and 178000 tons). Based on the analysis of 20 major stainless steel manufacturers in China, such as TISCO, Baosteel, Qingshan, and Jiuquan Iron and Steel Co., Ltd. (their total stainless steel production capacity reached 76% of the national total in 2016), as shown in Figure 5, the output of various stainless steel products in China has shown an increasing trend, among which the output of hot rolled products has increased rapidly. In 2016, the output of hot rolled stainless steel reached 13.74 million tons, accounting for 72% of the total output, 2.6 times of the output of cold rolling products; The output of 300 series stainless steel products has always maintained a high level with a rapid growth rate. In 2016, the output of 300 series stainless steel reached 10 million tons, accounting for 52.6% of the total output.