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S-H₂S-RSH falls under the category of active sulfide corrosion in high-temperature heavy oil environments in the oil refining industry. It is widely recognized that using corrosion-resistant steel materials is the most effective and stable protection method, and it represents the primary means of controlling such corrosion scenarios. The core reason is that this corrosion occurs at high temperatures of 350–400°C. Conventional corrosion inhibitors, coatings, and alkali washing for desulfurization either cannot function stably over long periods at such high temperatures or can affect the operation of subsequent oil refining processes; their protective effects and durability are far inferior to those of corrosion-resistant materials. As proven through long-term industrial use, the use of corrosion-resistant steel materials such as Cr5Mo, Cr9Mo, 1Cr18Ni9Ti stainless steels, or 20R+0Cr13 composite sheets allows the corrosion rate to be kept within the allowable range of 0.5 mm/a specified by the former Ministry of Petroleum Industry. This ensures the safe operation of equipment over the long term, and these materials are the standard choice for areas subject to high-temperature sulfur corrosion in refineries. Limitations of other auxiliary protection methods: Corrosion inhibitors and H₂S scavengers can only reduce the corrosivity of the medium under medium and low temperature conditions; they are ineffective in dealing with sulfur corrosion at high temperatures above 300°C ； Ordinary anti-corrosion coatings tend to crack and peel off at high temperatures, and are unable to provide long-term protection against S-H₂S-RSH media ； Electrochemical protection is only applicable to low-temperature water environments and is completely unsuitable for high-temperature heavy oil systems. In practical engineering, selecting corrosion-resistant materials is usually the key; combined with auxiliary measures such as process optimization and desulfurization of the medium, the best overall protection effect can be achieved.