新澳彩

The petrochemical industry operates under demanding conditions, requiring materials capable of withstanding sulphur- and chlorine-containing media, high temperatures and pressures, and highly corrosive environments. The stainless steel employed must possess core properties of corrosion resistance, high-temperature and high-pressure tolerance, and resistance to stress cracking, serving as a critical material for ensuring stable plant operation.The primary materials are based on 300 series austenitic stainless steels. Grade 304 stainless steel, containing 18% chromium and 8% nickel, offers resistance to general neutral media corrosion at an economical cost. It is suitable for crude oil storage, diesel transfer pipelines, and atmospheric pressure equipment. Grade 316L stainless steel incorporates 2-3% molybdenum, significantly enhancing resistance to pitting and crevice corrosion. It withstands hydrogen sulphide, chloride ions, and dilute acids/alkalis, finding extensive application in refinery heat exchangers, reactors, and sulphur-containing crude oil processing equipment. 2205 and 2507 duplex steels combine the structural advantages of austenitic and ferritic grades, offering twice the strength of standard stainless steels with outstanding resistance to stress corrosion cracking. They are suited for extreme corrosion environments such as deep-sea oil extraction and flue gas desulphurisation/denitrification.These stainless steels withstand temperatures from -20°C to 450°C and pressures from atmospheric to 10MPa. Certain special grades (e.g., 904L super austenitic stainless steel) enable long-term service in strong acidic environments. Their excellent weldability and formability meet the fabrication demands of complex equipment like large storage tanks, long-distance pipelines, and high-pressure vessels.Beyond base materials, advanced stainless steels like Hastelloy and Inconel alloys are employed for extreme conditions such as ultra-high-temperature hydrocracking and concentrated acid processing, further enhancing corrosion and high-temperature resistance. These materials significantly reduce equipment leakage and corrosion failure risks, extending service life by 3-5 times, thereby providing core support for efficient, safe, and environmentally sustainable production within the petrochemical industry.