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Stainless steel, with its comprehensive advantages of corrosion resistance, strength, toughness and ease of machining, has become an essential material for three major industries: mechanical manufacturing and equipment, petrochemicals and chemicals, and food and pharmaceuticals. Given the vastly differing operating conditions across these sectors, the performance requirements and material selection for stainless steel vary significantly, with its value being fully realised through precise adaptation.
一.Mechanical Manufacturing and Equipment Industry: Fortifying the Foundation of Equipment through ‘Strength + Machinability’
The machinery manufacturing and equipment sector must address load friction and precision machining, where stainless steel's combination of strength and workability proves pivotal. Type 304 stainless steel excels in machinability, making it suitable for general-purpose components such as pump and valve housings and construction machinery brackets. Type 316L stainless steel offers superior resistance to pitting corrosion, rendering it ideal for marine equipment contact parts. 410 martensitic stainless steel, after heat treatment, exhibits excellent wear resistance and durability, making it the preferred choice for shafts and gears. 2205 duplex steel doubles in strength, suitable for demanding conditions like high-pressure valves, extending equipment lifespan by over 30%.The petrochemical industry confronts sulphur- and chlorine-containing media alongside high temperatures and pressures, where corrosion resistance is paramount. Grade 304 stainless steel suits neutral applications like crude oil storage; Grade 316L stainless steel forms a protective molybdenum-based film, resisting hydrogen sulphide corrosion and finding widespread use in refinery heat exchangers and reactors. Under extreme conditions, Grade 2205 duplex steel and Grade 904L super austenitic stainless steel withstand concentrated acids and deep-sea environments, extending equipment lifespans from 1-2 years to 5-8 years while reducing leakage risks.
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Petrochemical and Chemical Industries: Withstanding Extreme Conditions Through Corrosion ResistanceThe petrochemical and chemical industries face prolonged exposure to corrosive sulphur- and chlorine-containing media alongside high temperatures and pressures. The corrosion resistance and high-temperature/high-pressure performance of stainless steel thus become critical to ensuring operational safety. The 300 series austenitic stainless steels form the foundational backbone. Type 304 stainless steel is suitable for neutral media applications such as crude oil storage and diesel transportation, offering cost-effectiveness and ease of machining. Type 316L stainless steel, owing to the passivation film formed by its molybdenum content, resists pitting and crevice corrosion induced by hydrogen sulphide and chloride ions. It is extensively employed in heat exchangers, reactors, and sulphur-containing crude oil processing equipment within refining and petrochemical plants.In extreme corrosion environments, 2205 and 2507 duplex steels combine high strength with exceptional corrosion resistance through their dual austenitic-ferritic microstructure, making them suitable for deep-sea oil extraction and flue gas desulphurisation/denitrification systems. 904L super austenitic stainless steel withstands concentrated acid environments, making it suitable for acid treatment equipment. These stainless steels operate within a temperature range of -20°C to 450°C and pressures from atmospheric to 10MPa. Through precise material selection, they significantly reduce equipment leakage risks, extending the service life from 1-2 years for traditional carbon steel equipment to 5-8 years, thereby fortifying safety defences in chemical production.
The petrochemical and chemical industries face prolonged exposure to corrosive sulphur- and chlorine-containing media alongside high temperatures and pressures. The corrosion resistance and high-temperature/high-pressure performance of stainless steel thus become critical to ensuring operational safety. The 300 series austenitic stainless steels form the foundational backbone. Type 304 stainless steel is suitable for neutral media applications such as crude oil storage and diesel transportation, offering cost-effectiveness and ease of machining. Type 316L stainless steel, owing to the passivation film formed by its molybdenum content, resists pitting and crevice corrosion induced by hydrogen sulphide and chloride ions. It is extensively employed in heat exchangers, reactors, and sulphur-containing crude oil processing equipment within refining and petrochemical plants.In extreme corrosion environments, 2205 and 2507 duplex steels combine high strength with exceptional corrosion resistance through their dual austenitic-ferritic microstructure, making them suitable for deep-sea oil extraction and flue gas desulphurisation/denitrification systems. 904L super austenitic stainless steel withstands concentrated acid environments, making it suitable for acid treatment equipment. These stainless steels operate within a temperature range of -20°C to 450°C and pressures from atmospheric to 10MPa. Through precise material selection, they significantly reduce equipment leakage risks, extending the service life from 1-2 years for traditional carbon steel equipment to 5-8 years, thereby fortifying safety defences in chemical production.