Coke tower material and thickness

Reply 1# yz-w: The operating temperature of the coke tower is approximately 485–500°C, and the operating pressure is about 0.1–0.27 MPa (gauge)； The coke oven used for producing needle coke can operate at a higher pressure. Periodic operations subject the coke tower to harsh working conditions such as rapid cooling and heating, as well as high-pressure water impacts, resulting in tower corrosion, deformation, bulging, and even weld cracks and tower tilting. The deformation of the tower is related to the material of the coke tower; in coke towers made of carbon steel, the diameter at the bulged area can increase by 200–250 mm. Coke towers made of carbon-molybdenum or chromium-molybdenum steel exhibit less bulging and radial expansion. The service life of the chromomolybdenum steel coke tower is 12 years ； The carbon-molybdenum steel coke tower has a lifespan of 8 years ； The carbon steel coke tower is only 7 years old. In the past, grade 20 steel was commonly used for the materials of coke towers in China, with wall thicknesses of 24–28 mm; after being in use for a certain period of time, bulging and deformation of these towers occurred as mentioned above. Abroad, chromium-molybdenum steel (1Cr-1/2Mo or 11/4Cr-1/2Mo) has been used since the 1970s to manufacture tower bodies, lined with 410-type stainless steel. ?