With the rapid development of the chemical industry in China, the use of stainless steel pipes is becoming increasingly widespread, and domestic stainless steel pipes grow at a rate of over 10% annually. At the same time, industries such as oil, natural gas, and geothermal refining have also performed well. Although there is currently a lot of pressure to short crude oil prices, the future rebound is bound to be more intense, and its recovery will drive further "awakening" of industries such as oil and geothermal refining.

In terms of use, the outstanding performance of stainless steel seamless pipes is mainly reflected in their high yield strength and resistance to stress corrosion. They have excellent weldability and are less sensitive to welding cold and hot cracks. In Japan, austenitic and ferritic stainless steel welded pipes account for 54% of the pipeline system in petrochemical work. However, stainless steel welded pipes in China are still primarily used in the decorative field, and the corrosion resistant welded pipes used in the petrochemical field are still relatively weak. Domestic stainless steel has a certain distance in terms of variety, standard, quantity, quality, and other aspects, whether in meeting market demand or comparing national industrial skill levels.

The details are as follows: in terms of quantity, the production of conventional stainless steel welded pipes has far exceeded the overall market demand, exacerbating the supply-demand contradiction. However, there is a lack of domestic output for materials with high demand, especially for industrial materials with high demand, such as high-pressure stainless steel boiler tubes, which are particularly weak; From the specific specifications, the output of conventional small and medium-sized stainless steel welded pipes is too large, and the supply of large diameter and high demand stainless steel pipes is far from meeting market demand, resulting in a large gap φ Extra large diameter stainless steel welded pipes above 530mm still rely on imports to compensate for domestic demand. For example, ultra long pipes (greater than 15m) are rarely produced domestically and are fundamentally dependent on imports; In terms of types, compared with advanced industrial countries, China has fewer types of stainless steel pipes, and there is almost no type of high skill content, such as dual phase steel, Hastelloy alloy, etc. Some specialized stainless steel pipes with high skill difficulty and quality requirements, such as heat exchanger pipes for power plant boilers and urea pipes for chemical fertilizer equipment, mainly rely on imports. Some stainless steel pipes with super corrosion resistance function are also rarely produced in China, The main focus is still on imports. In the petroleum and natural gas industries, stainless steel pipes are also one of the primary categories for using duplex stainless steel. However, currently, only a few domestic stainless steel pipes are used in the South China Sea oil field, and almost all rely on imports.

In addition, the stainless steel pipes used in LNG pipelines have basically been domestically produced, and the production capacity can basically meet domestic demand. In the refining industry, it is one of the earliest to use domestically produced duplex stainless steel. In refining companies such as Nanjing, Zhenjiang, Tianjin, Jinan, etc., it is widely used in the top fabric (or composite plate), internal components, air coolers, and water coolers of atmospheric and vacuum distillation towers. The longest one has been used for over 20 years. In terms of the production of small standard duplex stainless steel seamless pipes, the proportion of domestically produced pipes is increasing year by year. What is urgently needed is the production of larger standard seamless and welded pipes, and the production technology needs to be developed. However, the stainless 700mm production line has entered the debugging stage and can fill the gap in the seamless pipe market in the future.

In addition, how to reduce the cost of stainless steel pipe products is also related to the promotion of domestic dual phase stainless steel production technology. Of course, expanding output value and producing marketable goods on the right path are important, but in the context of the overall chaotic industrial structure in China and the reduced risk resistance of enterprises, it is obvious that reducing costs is more likely to help enterprises grow. At present, choosing molybdenum oxide balls to replace metal molybdenum and nickel oxide to replace metal nickel is the mainstream method to reduce production costs, promote the use of stainless steel pipe continuous casting skills, and improve yield.

If China can vigorously pioneer the industry of duplex stainless steel and promote potential market opportunities for both military and civilian use (such as construction - steel bars for construction, bridges, and concrete; manufacturing operations - containers, storage tanks, chemical transport ships, fast boats, and tank cars; and household equipment - high-level water tanks, electric water heaters, residential water and steam piping, etc.), and research and development, trial use Some new types of stainless steel pipes that are suitable for China's national conditions (such as low nickel and low chromium) and promote foreign development, such as low nickel and economical stainless steel pipes, believe that China's stainless steel pipes have a very broad application prospect.