Application and development trend of stainless steel tube in China shared by Carbon Steel close nipple supplier.
At present, the domestic duplex stainless steel tube with the annual growth rate of 10%, in the petroleum, urea and other industries also have a great future. The outstanding performance of duplex stainless steel tube is high yield strength and stress corrosion resistance, with good welding, welding cold crack and hot crack sensitivity is small. In Japan, austenitic and ferritic stainless steel pipes account for 54% of the pipeline system market share in the petrochemical industry. But our country stainless steel welded pipe mainly applies in the decoration domain, the corrosion resistance welded pipe which USES in the petrochemical domain basically still belongs to the blank.
Domestic stainless steel in varieties, specifications, quantity, quality and other aspects, no matter from meet the market demand, or with advanced industrial countries on the technical level, there is a certain gap. Concrete embodiment: in terms of quantity of products, the output of general purpose stainless steel has been in balance with the overall market demand. And the higher requirements of materials, production capacity is insufficient, especially the high requirements of industrial materials, such as high pressure stainless steel boiler tube and other basic blank; In terms of product specifications, general use of small and medium-sized diameter stainless steel pipe production capacity is greater than market demand, large diameter, high requirements of the stainless steel pipe, market demand, gap is larger, such as with 219mm above the large diameter stainless steel pipe also need to rely on imports to make up for the shortage. For the super-long customers (over 15m), there is little domestic production and they basically rely on imports. In terms of variety, compared with the advanced industrial countries, less varieties of stainless steel in our country, high technology content variety is almost blank, such as dual phase steel, such as hardox alloy, some technical difficulty is big, high quality requirements of special stainless steel tube, such as power plant boiler tubes for heat exchanger tubes, with urea in chemical fertilizer plants, still mainly rely on imports, some have good corrosion resistance of duplex stainless steel tube, domestic production, and rarely basic dependent on imports. To adapt to the wide application of duplex stainless steel, it is necessary to strengthen the popularization of duplex stainless steel welding technology and the research and development of welding materials.
China's stainless steel seamless tube started earlier, producing l0 high-standard pipe enterprises, with an average output of 8,000 tons/year. China's stainless steel welded pipe started late, the development of fast, stainless steel welded pipe production line more than 400.
Stainless steel tube is divided into seamless tube and welded tube. China's stainless steel seamless tube started earlier, so far, the production of stainless steel seamless tube enterprises about more than 1,000, comprehensive production capacity of more than 300,000 tons, but the production of high standard pipe enterprises l0, the average output of 8,000 tons/year. Stainless steel welded pipe China starts relatively late, development faster, so far, more than 400 stainless steel welded pipe production line, estimate the production capacity of around 720000 t/a, including the introduction of production line has more than 100, ten thousand tons of production capacity of 8 to l0, but can produce high-standard industrial pipe production capacity is very small, less production, most of the unit production of civil pipe and low standards for industrial use. Because stainless steel welded pipe is a secondary processing products, production enterprises more, and scattered, the output and consumption of the statistical discrepancy between the larger aspects. According to the analysis of various statistical data, the current production and consumption of stainless steel welded pipe in China are about 720,000 tons /a, and the consumption and production are basically balanced.
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