Stainless steel welded pipe is mainly used in heat exchange pipe, fluid pipe, pressure pipe, mechanical structure pipe, city landscape and other industries. The demand for stainless steel welded pipe for industrial use is large, and the production process is mature.
From the point of view of domestic stainless steel pipe products, austenitic steel is the main steel type; product varieties include: seamless steel pipe including cold-drawn pipe, cold-rolled pipe, hot-extruded pipe, centrifugal casting pipe, spinning pipe and so on.
Welded pipes include plasma welding, argon arc welding, submerged arc welding, light speed welding and high frequency welding. The production of stainless steel pipe basically covers the international standard varieties of specifications.
There are more than 100 kinds of specification varieties of stainless steel profiled pipes. The products are used in many fields such as industry and civil use.
The processing range and application environment of stainless steel tube of different materials are different. For example, 304 stainless steel tube can be used in heat exchangers, condensers, pressure vessels and other equipment industry, 409/436 tube can be used in the field of automotive exhaust systems.
Why stainless steel tube can be used in these fields?
1, 201 stainless steel tube corrosion resistance is general, mostly decorative tubes, such as stainless steel guardrail, stainless steel handrail, stainless steel security windows, etc. are basically 201 material.
2, 304 stainless steel pipe has strong corrosion resistance, heat resistance and low temperature resistance. They are mainly used for decorative and mechanical piping. 304 stainless steel pipe is used as handrails, guardrails, security windows and other decorative pipes in some coastal areas because of its strong corrosion resistance, and its heat resistance also shapes its deep processing performance, such as punching, bending round, etc., and is also basically selected 304 stainless steel pipe.
3, 316 stainless steel pipe corrosion resistance is better than 304, high temperature resistance is better than 304, generally used in mechanical piping, such as some boilers, high-temperature processing machinery fittings, aviation, bearings, chemical industry and so on.
Stainless steel pipe in petrochemical applications
Petrochemical industry, including the fertilizer industry, the demand for stainless steel pipe is extremely high, the industry mainly uses stainless steel seamless pipe, specifications: 304, 321, 316, 316L, 347, 317L, etc., the outer diameter of ￠18- ￠610 or so, the wall thickness of 6mm-50mm or so (generally use φ159mm or more specifications for low and medium-pressure pipeline), the specific areas of application are: furnace tube Specific application areas are: furnace pipe, material conveying pipe, heat exchanger pipe, and so on.
For example, heat-resistant stainless steel pipe is mainly used for heat exchange and fluid transport. Duplex stainless steel pipe with high strength, stress resistance, corrosion resistance, economy, etc., mainly used in chemical industry, fertiliser heat exchanger and fluid pipe market. Stainless steel bushings, stainless steel non-magnetic drill collars for oilfield drilling production, high resistance to CO, CO2 and Cl- corrosion super ferritic stainless steel Cr13, Cr25 and other oil casing.
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