Duplex Stainless Steel Pipe Used in Many Areas
Chemical and petrochemical processing industry
This area involves a wide range of conditions, complex conditions, a variety of media, but also the use of duplex stainless steel pipe earlier and more areas. At present, 200,000, large and more sets of 100,000 tons of small and medium-sized methanol synthesis reactor catalyst tube are made of duplex stainless steel, large and medium-sized devices using 2205 steel pipe, the use of imported pipe more small devices used 18- 5Mo-type domestic steel pipe.
Oil and gas industry
This is one of the main areas of foreign applications of duplex stainless steel, the current laying of oil and gas pipelines have been 1000km. Only a small amount of domestic use of the South China Sea oil field, all imports. In addition, the West-East Gas Pipeline Project in the Tarim Basin to consider the use of two-phase stainless steel pipe, the domestic conditions of production and manufacturing. Refining industry is the first use of domestic duplex stainless steel sector, in Nanjing, Zhenhai, Tianjin, Jinan and other refining companies and more concentrated in the atmospheric distillation column tower (or composite board), tower components, air coolers and Water cooler, etc., the longest has been used for 20 years.The production of small-size duplex stainless steel seamless pipe, the domestic has been more mature, the current urgent need to solve the larger specifications of the seamless pipe and pipe production, production process to be developed. In addition, how to double the price of stainless steel products down, but also related to the development of domestic duplex stainless steel. Although the expansion of production, production is very important to the marketable products, can not be ignored is to adopt new technology and new technology, the use of molybdenum oxide instead of metal molybdenum, nickel oxide instead of metal nickel, reduce the cost of smelting to promote the use of duplex stainless steel continuous casting technology, Improve the yield and so on.
Fertilizer industry using domestic 0Cr25Ni6Mo3CuN aging enhanced duplex stainless steel, the use of its wear and corrosion resistance, for the main process of urea plant pipeline specifications of the high pressure cut-off valve of the pieces, the effect is good. At present, the production of urea CO2 and NH3 gas extraction method are mostly high alloy austenitic stainless steel, and even titanium, the domestic has begun in the large urea plant on the ammonium pump pump body using high-chromium duplex stainless steel instead 316L (urea grade) steel.