During the production process of the paper industry, various corrosive media are involved, including chlorine-containing bleaching agents, acidic and alkaline chemical agents, high-temperature steam, and wet environments. The requirements for the corrosion resistance of equipment materials are extremely high. The 2205 duplex stainless steel plate, with its excellent resistance to chloride ion corrosion and high strength, has become the ideal material choice for key equipment in the paper industry.
The steaming and pulping system is a typical application scenario for 2205 duplex steel. In continuous steaming vessels and batch steaming pots, the equipment is in prolonged contact with high-temperature alkaline solutions and sulfide media. The inner cylinder and heating elements made of 2205 duplex stainless steel can effectively resist alkaline corrosion and stress corrosion cracking, significantly extending the equipment's maintenance cycle. A large pulp mill replaced the 304 stainless steel with 2205 duplex steel for the steaming vessels, increasing the equipment's service life from 3 years to over 10 years.
The bleaching process has particularly strict requirements for the corrosion resistance of materials. The bleaching agents used in this process, such as chlorine dioxide, hypochlorite, and hydrogen peroxide, are highly oxidizing and often contain chloride ions. 2205 duplex steel, due to its high chromium and molybdenum content, possesses excellent resistance to pitting and crevice corrosion, and is widely used in bleaching towers, scrubbers, and chlorine dioxide mixers. Compared with ordinary austenitic stainless steel, the corrosion rate of 2205 duplex steel in chlorine-containing bleaching media is reduced by approximately 50%.
The pulp transportation and storage system also requires corrosion-resistant materials. The pulp pipelines, storage tanks and agitators made of 2205 duplex stainless steel plates can withstand both the chemical corrosion of the medium and the abrasion caused by the pulp flow. Their high yield strength allows for thinner wall thickness designs, reducing the weight and manufacturing cost of the equipment.
In terms of the black liquor recovery system, 2205 duplex steel is used for equipment such as black liquor evaporators and alkali recovery furnaces, effectively resisting the combined corrosion of sulfides and chlorides in the black liquor, ensuring the long-term stable operation of the recovery system.
Jiangsu Cunrui Metal Products Co., Ltd. We specialize in supplying 2205 duplex stainless steel plates for the paper industry. Our products come in a wide range of specifications and we can provide technical selection support as well as material certification.
If you need any assistance, please feel free to contact our company at any time. We will be more than happy to serve you.