304 American standard stainless steel pipe manufacturing industry should be healthy and flourishing

304 American Standard Stainless Steel Pipe Manufacturing Industry Should Be Healthy and Flourishing At present, with the rapid development of China's economic construction, the consumption of stainless steel pipes is increasing, and the demand for stainless steel pipes is also expanding day by day, and the market prospect is promising. However, at present, domestic stainless steel pipes have a certain gap with market demand in terms of variety, specifications, quantity and quality. In terms of varieties, domestic stainless steel seamless steel pipes are still dominated by 1Gr18Ni9Ti which is eliminated abroad. The quality of domestically produced urea grade and high precision stainless steel is difficult to guarantee; the heat exchanger tubes of power station boilers and urea pipes for fertilizer plants mainly rely on imports; Duplex stainless steel pipes with good corrosion resistance are rarely produced domestically. In terms of product specifications, large-diameter, high-demand stainless steel pipes and ultra-long pipes have large gaps; the production capacity of general-purpose small and medium-diameter stainless steel pipes is greater than market demand. In terms of product quantity, higher standard industrial welded pipes, especially high-demand industrial pipes, are basically blank. The output of ordinary stainless steel pipes is balanced with the overall market demand. The production capacity of ordinary seamless pipes is excessive, and the medium and low grades are standard. The supply of stainless steel decorative welded pipe market exceeds demand.
In the past ten years, with the rapid expansion of the application field, the demand for stainless steel pipes of different materials, different specifications, different varieties and different uses has soared in China; coupled with the high added value of stainless steel pipes, the enterprises producing stainless steel pipes have been in the 1980s. At that time, more than a dozen of them have grown to more than 400, and the comprehensive production and processing capacity has exceeded 1 million tons. The actual production has increased from 50,000 tons in 1989 to 390,000 tons in 1999; there are few enterprises with a production level of 5,000 tons. Most are small factories with an annual output of less than 1,000 tons. Steel grades develop from a single austenite to martensitic and ferritic duplex steels and high alloy steels; the product varieties include seamless steel tubes, cold drawn tubes, cold rolled tubes, hot extruded tubes, centrifugally cast tubes, and spirals. Pressure pipe; welded pipe includes: plasma welding, argon arc welding, submerged arc welding, light speed welding and high frequency welding and other welded pipes. The stainless steel pipes that can be produced basically cover the specifications of various countries in the world, the specifications of stainless steel shaped pipes, There are more than one hundred varieties, and the products are used in many fields such as industrial and civil. The output of stainless steel welded pipes in some developed countries in the world accounts for 65% to 75% of the total output of stainless steel pipes. The production capacity of stainless steel welded pipes in China is not compatible with the domestic market demand. It is predicted that the annual demand for stainless steel welded pipes in the domestic market will be at least 60,000 tons in the 21st century.

Domestic stainless steel welded pipe production is mainly produced by continuous forming unit and UOE method. The welding methods are all inert gas shielded welding and continuous forming units. In the process of producing thin-walled steel pipes, single-gun welding is generally used. The industrial pipe production with a wall thickness of 2-3.2 mm also has 3-4 gun welding. One shot of plasma plus three guns argon arc welding and other welding methods. Due to the high-energy plasma, the deep-melting ability is strong. In steel pipes with a wall thickness of less than 6 mm, plasma welding and single-sided welding have been used for double-sided molding. The UOE method mainly produces large diameter pipes and thick-walled stainless steel pipes, and generally adopts plasma welding ten-argon arc welding. At present, domestic high-quality stainless steel welded pipes and weld bead on the inner and outer surfaces of steel pipes can be produced in China for smoothing. The weld has the same properties as the base material. In order to ensure the quality of industrial pipes, advanced welding seam tracking, post-weld finishing and other advanced technologies have been adopted. At present, domestically produced stainless steel pipes are generally still treated by off-line treatment. Most of the heat treatment furnaces for heat treatment of stainless steel pipes are gas-fired, continuous roller hearth furnaces, in addition to an electric heating continuous roller hearth furnace, three fuel continuous roller hearth furnaces, and two box furnaces. At present, advanced online heat treatment has also been applied, and five continuous production lines have been used in China. The muffle tube type brightening furnace and the roller bottom type protective atmosphere bright heat treatment furnace were also adopted. At present, the tube blanks of domestic seamless steel pipes are mainly produced in the factories of Shanggang No. 5, Taigang, Daye, Fushun, Xining, Nantong, Fengye, etc. In some areas, the production of tube blanks is backed by the intermediate frequency furnace to produce scrap steel. .

The main producing areas of domestic industrial welded steel pipes are Taigang, Zhangjiagang Pohang, Ningbo Baoxin and Shanggang No. 3, and some imported raw materials are also used. The landscape materials for building decoration include imported thin strip steel as raw material for production, raw materials produced by cold rolling of cold-rolled narrow belts, slabs produced by medium frequency furnace, narrow hot strips by forging and rolling, and narrow strips produced by cold rolling. . At present, the quality of domestically produced stainless steel seamless pipes is uneven.

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