Stress corrosion fracture is a common failure form of flange forgings in petrochemical ring parts. This form of failure usually occurs when the material is subjected to a combination of tensile stress and corrosive media. Stress corrosion fracture can cause equipment damage and even lead to safety accidents, so the prevention of stress corrosion fracture is of great significance to ensure the stable operation of equipment. This paper discusses the stress corrosion fracture prevention of flange forgings of petrochemical ring parts.
Stress corrosion fracture refers to the brittle fracture that occurs when the material is subjected to the joint action of tensile stress and corrosive medium. This kind of fracture usually occurs in the stress concentration area of the material, such as cracks, inclusions, etc. When the material is subjected to tensile stress, the area around the crack or inclusion will undergo local plastic deformation, resulting in stress concentration. At the same time, corrosive media will invade these stress concentration areas, accelerating the corrosion and fracture process of the material.
Preventive measures of stress corrosion fracture
Choosing the right material: Choosing the material with excellent stress corrosion resistance is an important measure to prevent stress corrosion fracture. Commonly used materials include high strength alloy steel, stainless steel and so on. These materials have good corrosion resistance and stress corrosion resistance, which can effectively reduce the risk of stress corrosion fracture.
Optimization of manufacturing processes: By optimizing manufacturing processes such as casting, forging, and heat treatment, defects and stress concentration areas within the material can be reduced, thereby reducing the risk of stress corrosion fracture. At the same time, reasonable manufacturing process can also improve the density and corrosion resistance of the material, and further reduce the risk of stress corrosion fracture.
Control working environment: Try to avoid the use of petrochemical ring flange forgings in the environment of high temperature, high pressure and corrosive media. If it cannot be avoided, the corrosion of the corrosive medium on the material and the formation of the stress concentration area can be reduced by controlling the temperature, pressure and concentration of the corrosive medium in the working environment.
Regular inspection and maintenance: Regular inspection and maintenance of petrochemical ring flange forgings, timely detection and treatment of potential cracks and defects. At the same time, regular maintenance and maintenance of the equipment to ensure the normal operation and service life of the equipment.
This paper discusses the stress corrosion fracture prevention of flange forgings of petrochemical ring parts. By selecting the right materials, optimizing the manufacturing process, controlling the working environment and regular inspection and maintenance measures, the risk of stress corrosion fracture can be effectively reduced to ensure the stable operation and service life of the equipment. This is of great significance to ensure the safety of the petrochemical industry.
