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Comparison table of common materials for metal outer protective tubes – Domestic vs. foreign materials. Sequence number, domestic material grade, foreign material grade, maximum operating temperature, and application of the material: 100Cr18Ni9, 0Cr18Ni10Ti, 304, 321; 930°C – austenitic stainless acid-resistant steel (heat-resistant, oxidation-resistant). 200Cr17Ni14Mo2, 1Cr18Ni12Mo2Ti, 316L, 316; 980°C – austenitic stainless acid-resistant steel (heat-resistant, resistant to inorganic and organic acids, alkalis, as well as corrosion in marine atmospheres). 30Cr25Ni20, 310S; 1100°C – ferritic high-chromium stainless steel (heat-resistant, with good intergranular corrosion resistance at 800°C when cooled in air, and good oxidation resistance at 1000°C and 1100°C). ) 4GH3030 Incone16001100℃ – a nickel-based high-temperature resistant and corrosion-resistant alloy with high strength at high temperatures; it boasts excellent corrosion resistance, as well as oxidation resistance, and offers high resistance to various exhaust gases, alkaline solutions, and most organic acids and compounds. ) 5 Incoloy800: a nickel-based high-temperature resistant and corrosion-resistant alloy with high strength at high temperatures, as well as excellent resistance to oxidation and carburization. Resistant to sulfur erosion, internal P oxidation, and phosphorus flaking under various atmospheres. ) 6GH3039: A nickel-based superalloy suitable for use at temperatures of 1200℃; it possesses excellent corrosion and oxidation resistance, as well as high thermal strength, maintaining good oxidation resistance even at 1200℃. ) 7GH747 is a nickel-based superalloy suitable for operation at 1300℃; in addition to its excellent corrosion resistance, it also boasts good high-temperature oxidation resistance and strength. ）