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Facilities and equipment
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Application Type
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Environmental requirements (temperature, pressure, medium)
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Recommended model/material
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Expected service life (years)
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Material selection considerations
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Offshore platform structures
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Structural support, piping system
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120°C,high pressure ,highCl⁻Seawater, high humidity, salt spray
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316L, 2205, 2507, 904L
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15-25+
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Excellent resistance to pitting and crevice corrosion is required; duplex steel has high strength and can reduce weight
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Oil Well Tubular Goods/Non-magnetic drill collar
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Wellbore interior, drill collar
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Formation temperature and pressure, H₂S, CO₂, Cl⁻Media environment ,formation water
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Non-magnetic drill collar :highMnAustenitic steel ;Oil Well Tubular Goods: 13Cr, 22Cr, 25CrSuper martensite
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10-20 (depending on the degree of corrosion)
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Non-magnetic drill collars need to be paramagnetic; oil well pipes must be resistant to CO₂ and H₂S corrosion
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Oil and gas pipelines
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Onshore/submarine long-distance pipelines
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100°C+,high pressure, H₂S, CO₂, Cl⁻Media environment ,Multiphase flow
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X80Grade martensite (13Cr),Duplex steel2205, 2507
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20-30
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HIC/SCC resistant; newly developed low-carbon martensitic steel has good weldability and can replace some duplex steels
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Atmospheric and vacuum distillation unit
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Tower body, internal components, heat exchanger
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500°C,Pressure changes, S, cyclohexane acid,H₂S、H₂、HCl+H₂S+H₂OMedia environment
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304, 321, 316L, 317L
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15-25
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High temperature sulfur and cyclohexane acid corrosion; the top condensation area needs to be resistant to wet HCl corrosion, and 321 is commonly used
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Catalytic cracking unit
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Reactor, regenerator, hot air duct
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500°Cabove even 700°C,Catalyst particle abrasion ,High temperature oxidation and sulfurization
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304H, 321, 310S
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15-20
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Heat resistance, high temperature oxidation resistance, erosion wear resistance
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Hydrocracking/Refining device
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Reactors, high-pressure heat exchangers, pipelines
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300-500°C,high pressure(~15MPa), H₂, H₂S, NH₄Cl, NH₄HSMedia environment
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321, 347, 316L, Duplex Steel 2205, Alloy 825
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20-25
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Resistant to high temperature hydrogen corrosion and H₂S corrosion; NH₄Cl/NH₄HS is prone to cause under-deposit corrosion and stress corrosion cracking, so attention should be paid to material selection and process
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Ethylene cracking furnace
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Furnace tubes, heat exchangers
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Exceed800°CEven reaching 1100°C,coking ,carburization ,High temperature oxidation
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310S, HPSeries heat-resistant alloys
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10-15 (furnace tube)
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Excellent resistance to high temperature oxidation and carburization
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Chemical reactors
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Reactors, crystallizers, agitators
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200°C,Corrosion by organic acids such as acetic acid, bromide ions, and formic acid
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316L, 317L, 904L, Duplex Steel 2205
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20+
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Resistant to localized corrosion from organic acids and halogen ions
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LNGStorage tanks and pipelines
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Inner tank wall, low-pressure transmission pipeline
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Ultra-low temperature (-162°C), normal temperature, variable pressure
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304L, 304N, 316L, 9%Ni steel
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30+
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Ensure ultra-low temperature toughness and prevent low temperature brittle fracture
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Crude oil and processed product storage tanks
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Tank body and internal components
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Normal temperature ,Normal pressure ,Acidic water andH₂S, Cl⁻, H₂OMedia environment
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304, 316L (for highly corrosive products or acidic water environments)
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20-30
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Select according to the corrosiveness of the stored product; pay attention to the corrosion of the gas phase space when using the internal floating roof
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Flue gas desulfurization equipment
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Absorption tower, flue, heat exchanger
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Acidic environment(pH 2-5), 60-80°C, Cl⁻, F⁻Medium environment,Particle wear
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317L, 904L, 2205,254SMO
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15-20
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Resistant to dilute acid corrosion, pitting corrosion, crevice corrosion, and wear
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Water treatment system (heat exchanger)
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Tube sheet, tube bundle
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100°Cabove ,Pressure changes ,cooling water(Cl⁻Ingredients, microorganisms, and sediment)
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304, 316L, 2205,Titanium
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15-25 (depending on water quality)
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Resistant to Cl⁻ pitting corrosion, crevice corrosion, and biological corrosion; higher grade materials are used when water quality is poor
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