Petrochemical industry stainless steel pipe application demand and development trend

The first stage of the development of the petrochemical industry is the founding of New China to the reform and opening up, the basic formation of China's petroleum and chemical industries of the basic system. The second stage is the reform and opening up to the end of the last century or the beginning of this century, China's petrochemical industry developed into a supporting industrial system. The third stage is the 20 years since the new century, opening a new journey of high-quality development of the petrochemical industry. 2019 China's petrochemical industry accounts for about 40% of the world total, and China's contribution will be further increased to 50% in 2030. The petroleum and chemical industry is generally divided into industrial chains based on raw materials, which are usually referred to as coal chemical, salt chemical, petrochemical, biochemical, and phosphorus chemical. The petrochemical industry chain is usually the production of oil products, basic organic chemicals, fine chemicals, synthetic materials with oil and natural gas as raw materials. Petrochemical industry demand for the use of stainless steel can be roughly divided into four areas, which are corrosion resistance, low temperature resistance, high temperature resistance, high strength.

General corrosive environment and clean requirements of the environment commonly used for 304, 316 materials; pitting and crevice corrosion environment commonly used 2205, 2507 materials; low temperature environment commonly used materials 304, 304L; high temperature environment commonly used materials 304H; alkali stress corrosion environment commonly used 316 materials; carbon dioxide corrosion environment commonly used 304L, 316L materials; high temperature hydrogen and hydrogen sulfide environment commonly used 321H, 347H materials are mainly. In addition, respectively, the LNG plant, ethylene plant, PDH plant, coal gasification plant and oil refinery stainless steel material application environment was briefly sorted out. Finally from the petrochemical stainless steel pipe demand situation, compared to the poor corrosion resistance of martensitic stainless steel and ferrite stainless steel brittle too large lack of electricity, austenitic stainless steel has better corrosion resistance, welding properties, low temperature performance, and non-magnetic, and thus become the most widely used stainless steel for petrochemical. Due to the composition control, heat treatment and welding restrictions, ferritic stainless steel pipe is currently used less in the petrochemical industry, but with the application of smelting and heat treatment equipment technology will gradually increase. With the gradual implementation of the carbon peak requirements, the amount of stainless steel in the coal chemical industry will still show an increasing trend, especially the subsequent environmental protection devices, the amount of duplex steel in the sewage treatment unit is also larger.

Low-alloy stainless steel such as 2102, can be used for some clean requirements of low corrosion conditions, some design institutes have begun to design, for some of the heavier corrosion environment, such as oil and gas fields, marine environment, etc., the success of the development of 2707HD will also partially replace nickel-based alloys. The amount of high alloy for poor quality crude oil, flue gas desulfurization, high chlorine crude oil oxygen pipeline network is still on the trend of increasing. Give attention to the electrolytic chlorine production, liquid hydrogen preparation and storage and transportation, hydrogenation and other industries, the overall amount of stainless steel is not much, but the device will blow up in the future, and the material requirements are high, will certainly occupy the center of the upstream energy pattern. Stainless steel pipe in the petrochemical and other process industries is a very wide range of application prospects. But at the same time, the majority of stainless steel products production and processing, application areas put forward numerous new and more in-depth requirements. So this is also the main task of China's stainless steel industry in the new phase.

The stainless steel industry should be shifted from solving the problem of availability to user-oriented production refinement, deep processing, variety research and development and manufacturing production process as well as application research in parallel with the new stage. In addition, should also pay attention to the material circulation link to communicate the role of the bridge between production and application. In this regard, the current steel production enterprises and users directly occur in the order of supply and marketing model should be studied in depth, in order to adapt to the future user more segmented, small quantities, varieties, special requirements of the new market requirements.