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Market development of thin wall stainless steel water pipe

Author:     Date: March 13, 2019    Source:    Focus on:


        The problem of drinking water quality has been trapped in people's hearts. In addition to the protection and control of water quality resources, the second is the continuous improvement of the quality requirements of water transportation equipment. Since China's reform and opening up, water conveying equipment has experienced several generations of development from iron pipe, galvanized pipe, plastic pipe and copper pipe, but it still fails to meet the requirements of relevant standards for water sanitation. Drinking water health is related to the national economy and people's livelihood. Several generations of leaders, experts and scholars have discussed and studied the problem of drinking water pollution for many times. Urban water distribution network is responsible for solving the daily life water of tens of millions of people. How to thoroughly solve the secondary pollution problem of drinking water pipe network has a great relationship with the quality of pipe materials. In recent years, with the continuous development of social economy, people's living environment has been further improved, and the increase of income has made people's health standards and construction material selection requirements of healthy residences constantly improved. The health and environmental protection of pipelines has always been the most concerned problem of the people. We know that in the city's water pipe network, the water flowing in the big pipe is relatively clean, but the water entering the small branch pipe of the family becomes stagnant water. For example, the water discharged from the tap every morning is actually left in the pipe the night before. After a night of stillness, bacteria will grow, and the red water, yellow water, black water and stinky water will flow out. The reason is self-evident. The problem mainly comes from the pollution of galvanized iron pipe and plastic pipe. Because of the material of the pipe itself, after a long time of water infiltration, harmful substances are easy to enter the water body. In some economically developed countries, this kind of problem has been recognized for a long time, and has taken the lead in reforming domestic water pipelines, and stainless steel pipes and fittings have been used in many pipeline materials.
      Stainless steel pipe has a long history in the world, the early mainly thick wall screw connection and welding connection. Due to the high cost and high cost of thick wall stainless steel pipe, although it has excellent health and performance, it does not fully conform to the concept of social development of energy saving. Therefore, some experts started to study the technology of stainless steel "thin-wall" connection. Finally, the earliest connection technology of thin-walled stainless steel pipe was produced in Sweden in 1959. Because of the good application effect of the product, it was quickly popularized, and then developed to Germany, Germany, Germany and other countries Britain, China and Taiwan. The continuous development of thin-walled stainless steel pipe connection technology ensures the technical performance required by water supply and drainage design, and overcomes the high price of thick wall stainless steel pipe and the instability of threaded connection. With the natural development of market demand, it is inevitable to promote the popularization and application of thin-walled stainless steel pipe.  
        The stability of stainless steel pipe can effectively prevent the pollution caused by material. The stainless steel pipe has high strength, can withstand strong vibration and impact, has the characteristics of water leakage, non burst, fire prevention, earthquake resistance, and is widely used. Besides disinfection and sterilization, it does not need to control the water quality. At the same time, there is no corrosive and turbid exudate. If water stays in the pipeline for a long time, it will not affect the water quality and put an end to secondary pollution. Obviously, this is a health barrier.
Domestic thin-walled stainless steel pipe is a new type of pipe which came out in the late 1990s. Due to its characteristics of safety and health, corrosion resistance, durability, long service life, maintenance free and beautiful appearance, stainless steel water pipe has a strong development momentum and has been widely used in building water supply, direct drinking water and solar energy system pipes. At first, some projects designed copper tubes, and finally changed to thin-walled stainless steel tubes. Now, copper pipe has gradually withdrawn from the market. In addition to the civil home decoration market, hotels, guildhalls, buildings, hospitals and schools have basically popularized the design and application of thin-walled stainless steel water pipes.
        At present, the mainstream connection of thin-walled stainless steel in the market can be divided into two categories: compression type and welding type. Although the domestic standard parameter of compression type pipe fittings is DN 15-dn 100, at present, the domestic enterprises are not very mature in the connection technology of large diameter pipe, including clamping tools. Therefore, the application of compression type pipe fittings is suitable for the diameter of less than 50 mm, In addition, the small diameter pipe is connected by clamping pressure, which is convenient for construction and saves construction cost. The strength and compressive strength of the thin-walled stainless steel pipe with diameter larger than 50 mm is relatively weak, so it is not suitable to be popularized at present.
        In addition to mechanical connection, thin-walled stainless steel water pipe is also connected by argon arc welding. The traditional and mature welding methods are generally divided into butt welding type and socket type argon arc welding type. The butt welding construction requires the inner wall to be protected by gas, and its process is suitable for the connection of stainless steel pipes of all sizes and diameters. The connection technology is the most reliable one for metal pipeline connection at present. However, because the stainless steel pipe butt welding needs gas in the construction, it is inconvenient for the construction. For the socket type thin-walled stainless steel pipe fittings, the new connection process does not need to fill with welding wire, and if the welding pool is not penetrated according to the industry standard, there is no need to pass through the inner wall gas protection, which solves the inconvenience of gas protection in site construction, but the wall thickness of water pipe is required to be more than 0.8mm. Socket type argon arc welding connection, especially large diameter water pipe connection, is more popular with users. For example, key projects such as Xianggelila Hotel, Beijing Olympic Water Cube, Olympic Basketball Stadium, Guangzhou Asian Games Village, Hong Kong Hutchison Whampoa real estate and other key projects all use welded connection. In a word, the two types of thin-walled stainless steel water pipes have their own advantages, and the clamping connection is more suitable for the home decoration market; Welded connection is more suitable for engineering project market, safe and energy-saving.
After the advent of stainless steel water supply pipeline, stainless steel drainage pipe and pipe fittings have gradually developed and matured in China, especially in siphon drainage, sewage treatment, medical and food factory drainage system, we can experience the excellence of stainless steel pipe, but it is only suitable for butt and socket type argon arc welding connection.
        The development of thin-walled stainless steel pipe industry is bound to be the leading role in the future pipeline stage, but the biggest problem at present is the market ideology. China's construction industry generally agrees with the advantages of thin-walled stainless steel pipe, but it has some reservation on the price. Generally speaking, stainless steel pipe is more expensive. Today, the buildings in our country are close to the advanced level in the world, and some of them have occupied the leading position in the world. Thin wall stainless steel pipe has excellent quality and the necessity of market demand. Once the common people accept its market positioning in consciousness, its market will develop by leaps and bounds. Thin wall stainless steel pipe is the concept of modern scientific development. Compared with other types of pipeline, it has the characteristics of environmental protection, health, safety and durability, which is the embodiment of the progress of the times.
      From an economic point of view, the quality of modern buildings is the most important. The investment of several thousand yuan per household in pipe network is insignificant compared with that of one million yuan of real estate. Moreover, the damage caused by pipeline leakage is incalculable. According to the relevant provisions for individual residence in China, the service life of the residence is 70 years. According to the theoretical data, the service life of the stainless steel water pipe is 120 years, that is to say, the stainless steel water pipe can ensure that there is no need to repair and replace during use. After ten years of use, even if the house is decorated, it only needs to replace and repair the civil decoration part. If we want to dismantle and replace the concealed pipeline, it will cost a lot. What's more, when the ordinary pipeline is not in need of maintenance, the water pipe will have serious pollution and leakage. Instead of destroying the integrity of the decoration in the repair and repair, one-time investment, long-term benefits, the use of stainless steel pipes to save maintenance and prolong the service life of the pipe network, although the current price of stainless steel pipes is higher than ordinary materials, but from a long-term perspective, it is still very economic to save the investment in repair and replacement, and the customer property loss is almost zero.
        From the health point of view, stainless steel pipe network can provide clean water, improve the living standard of users, and improve the safety degree of pipe network. When the ordinary water pipe out of a strange smell or black and yellow water, we drink with fear, always aware of the threat to health. When the stainless steel pipe pours out pure water, it seems to see the dew of Tianshan Mountain, and the pulse of health pulsates strongly in the flow. Compared with other pipes, this is an incomparable advantage, and it is precisely this advantage that the stainless steel pipe will enter thousands of households.
        Therefore, with the development of national economy and the improvement of people's living standards, thin-walled stainless steel water pipes and stainless steel pipe fittings are indispensable parts of future buildings. It has become a new trend in the development of domestic water supply pipeline system.
The development history of national standards and specifications for domestic stainless steel water pipe is as follows
On August 24, 2001, the Ministry of Construction issued the industry standards of CJ / 151 thin wall stainless steel water pipe and cj152 stainless steel compression pipe fittings.
In 2001, the China technology market management promotion center of the Ministry of science and technology of the people's Republic of China issued a notice on the promotion and application of "high diameter to wall ratio and high-precision stainless steel medium and high-pressure water supply pipes, supporting pipe fittings and special technology", which fully affirmed the thin-walled stainless steel pipes, and believed that the popularization and application of the technology and products would improve the level of modern buildings, It is of great significance to improve and guarantee the quality of water supply.
In February 2003, China Building Standard Design Institute issued the national technical measures for civil building engineering design, which proposed that thin-walled stainless steel pipe should be preferred for pipe material.
On July 10, 2003, the General Administration of quality supervision, inspection and Quarantine of the people's Republic of China issued a series of standards (GB / t19228.1, GB / t19228.2 and GB / t19228.3) to promote the stainless steel compression pipe system.
No. [2003] 194 document of Beijing water supply company forbids the use of galvanized water pipe, and advocates the use of stainless steel pipe.
On July 12, 2004, the Ministry of Construction approved the installation of building water supply metal pipe - thin wall stainless steel pipe (04s407-2) edited by the architectural design and Research Institute of Tongji University as the national building standard design, which was implemented from August 15, 2004.
On July 12, 2006, the Ministry of construction of the people's Republic of China and the General Administration of quality supervision, inspection and Quarantine of the people's Republic of China issued the requirements in the design plan for urban filling gas (GB 50028-2006). It is proposed that when stainless steel pipe is selected for indoor gas pipeline, the socket type pipe fittings of thin-wall stainless steel pipe shall be selected and connected by argon arc welding.
In 2009, Yb / T ×××《 Welded stainless steel pipe for water supply, cjjxxx-200x technical specification for metal pipe engineering of building water supply, CECS   Xxx-200x "technical specification for connection of thin wall stainless steel pipe for building water supply and drainage" and GB / t19228.2-200 □ "thin wall stainless steel pipe for food and water supply industry" have been submitted for approval.
        Today, China's thin-walled stainless steel water pipe industry is gradually standardized. The connection technology of the manufacturers is various, and each has its own advantages. At present, China's thin-walled stainless steel water pipe connection mode can be called the world's most. Because of this characteristic in China, many enterprises and experts have made careful research and development, vigorously developed and put into the thin-wall stainless steel pipe market, which has promoted the development trend of stainless steel pipe. In the future, this trend will create a healthy, environmental protection and sanitary condition for national domestic water, At the same time, it will make stainless steel pipe enterprises win more market.

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