Regarding questions about the material of coke towers, please ask experts to answer

The second option is generally chosen. . . :lol

410S is also 0Cr13:lol

Why do I feel it’s a bit messy? 1.25Cr0.5MoR is equivalent to 14Cr1MoR (in China). The 410S type is a stainless steel composite sheet that is used in environments with high sulfur content. When selecting materials for coke towers, the following considerations are generally applied: the lower part of the tower wall usually has a protective layer formed by coke, which acts as a barrier against corrosive substances. When general corrosion is not significant, carbon steel is often used as the material. Above the foam zone in the upper section of the coke tower, high-temperature sulfur corrosion and low-temperature dew point corrosion occur during reuse of this part of the tower; therefore, carbon steel + 0Cr13 AL composite steel or chromium-molybdenum steel + 0Cr13 AL composite steel is used for constructing this section. Due to the enlargement of coke towers, thick carbon steel is used, which tends to undergo graphitization. 1.25Cr0.5MoR (domestic grade 14Cr1MoR) for the upper section, 14Cr1MoR for the lower section – this was the standard specification for Maoming Petrochemical’s 1 million-ton capacity coke tower with a diameter of 8600 millimeters in 2004

Oh. . . I understand now. . . Regarding the lining plates, are you considering using imported 0Cr13 (referred to as 410S abroad) or opting for domestically produced 0Cr13 (under the new standard as 08Cr13)? The main body of the equipment is made of heat-resistant steel SA387 in accordance with ASME standards, which is equivalent to 14Cr1MoR in China. . . I recommend that both the equipment body and the lining composite panel can be made from domestic products. . . Of course, if the organization has the funds, it can import everything. . . :lol

Are there differences between SA387Gr.11CL1 and SA387Gr.11CL2 materials?

Which TX leader has the technical data for SA387Gr.11CL1 and SA387Gr.11CL2? Thank you all first! This post was last edited by chengkang on 2009-2-22 14:02.]

What is the difference between SA387Gr.11CL1 and SA387Gr.11CL2 materials used in coking towers?????????????

According to research, almost all coke towers abroad are manufactured using stainless steel composite panels. Based on our country’s experience, since there is a layer of coke providing protection in the middle and lower parts of the coke tower, corrosion is minimal, so composite panels are not necessary. In accordance with the provisions of SH/T 3096–2001 \"Guidelines for Design and Material Selection of Key Equipment in Units Processing High-Sulfur Crude Oil\", stainless steel clad plates should be used from the top down to 200 mm below the foam layer, with the cladding material being 0Cr13A1 or 0Cr13. For the double-layer structure, 0Cr13A1 (i.e., 405 steel) and 0Cr13 (i.e., 410S) are used – which one is better? According to API surveys, the United States primarily used 405 steel before 1969, and 410S steel after 1970, as shown in Figures 6–8. According to available information, the use of type 405 stainless steel should be limited to temperatures below 343°C; when exposed to temperatures between 371° and 538°C for an extended period, this type of material becomes brittle. Above 343°C (650°F), only 410S stainless steel can be used for internal components. At present, many stainless steel clad plates in China use type 405 (i.e., 0Cr13A1) as the cladding layer, and there have been no reports of brittleness associated with 0Cr13A1. However, since the cladding layer of coke tower shells is exposed to temperatures between 427 and 495°C for extended periods, it is considered safer to use 0Cr13 (i.e., 410S). Practice has shown that cracks can also occur in the welds of coke tower claddings; to reduce the occurrence of such cracks, some experts suggest using INCONEL625 instead of the commonly used 405 or 410S as the cladding material. Its advantages include not only better corrosion resistance but, more importantly, less thermal stress generated due to differences in thermal expansion between the coating layer and the base layer, which reduces the likelihood of cracks forming. Based on a finite element analysis of a coke tower with an inner diameter of φ6840 mm, manufactured from C-1/2Mo steel, the base layer has a thickness of 20 mm, while the cladding layers are made of 405 or 410S with thicknesses of 1.6 mm or 3.2 mm respectively. The analysis was conducted with the composite plate at 482°C. The analysis shows that the stress strength of 405 or 410S is 13 times that of INCONEL625. Table 6-3: Stress strength analysis for coke tower linings. Layer and thickness Stress strength (psi): 405 or 410S, 1.6 mm – 31,784; 405 or 410S, 3.2 mm – 30,564; INCONEL625, 1.6 mm – 2,460; INCONEL625, 3.2 mm – 2,380. Statistically, using INCONEL625 with a thickness of 1.6 mm for the lining results in a 30% increase in the cost of the coke tower ； When INCONEL625 with a thickness of 3.2 mm is used, the cost increases by 40–50%. When INCONEL625 is used partially, for example in the vertical welds of the lower section of the tower and in other areas prone to bulging deformation and welding cracks, with a thickness of 1.6 mm, the cost increase will not exceed 15–20%.