Thread Content
The onset temperature for high-temperature sulfur corrosion is 230°C, which is the key threshold distinguishing low-temperature sulfur corrosion from high-temperature sulfur corrosion. When the temperature exceeds 230°C, the corrosion reaction between sulfur-containing media and metals is defined as high-temperature sulfur corrosion. In actual industrial environments, high-temperature sulfur corrosion occurs primarily in sulfur-containing media at temperatures above 240°C. At such temperatures, the organic sulfides present in crude oil begin to decompose, producing highly corrosive forms of sulfur such as H₂S and elemental sulfur, which then react with metal equipment, leading to uniform thinning-type corrosion. 230°C: The high-temperature sulfur corrosion onset temperature threshold according to authoritative definitions. Above 240°C: The actual temperature range in which significant corrosion occurs, commonly found in high-temperature areas of refining units such as atmospheric and vacuum distillation, catalytic cracking, and delayed coking. 420–430℃: The range with the fastest corrosion rate; severe corrosion is more likely to occur, especially in carbon steel materials under high fluid flow rates. Furthermore, the material composition has a significant impact on the corrosion rate; for example, in carbon steel, a silicon content below 0.10% significantly accelerates the corrosion process.