In our daily lives, whether it is on the tiny tableware plates, the stainless steel products that are still used in the design, decoration, and environment are basically more and more extensive. Therefore, what must be paid special attention to in the processing of stainless steel products?
Stainless steel products are processed into alloy products, and there are various different crystal phases. When the working temperature changes, the crystal phase changes correspondingly. Therefore, in the processing of stainless steel products (such as mechanical parts processing, precision casting, welding and laser cutting, etc.), one is that the locality is directly affected by the working temperature and it is easy to precipitate new phases (local phase transition), and the intergranularity The chemical and physical state of the substance is different from the crystal grain itself, and the corrosion rate at the grain boundary is obviously higher than that of the crystal grain itself (intergranular corrosion). The precipitation of these new phases will definitely result in the lack of certain elements. Whether the precipitated new phases resist corrosion or are not corrosion resistant, it will cause the imbalance of the corrosion rate-pitting corrosion or pitting corrosion.
Under normal circumstances, special attention should be paid to the processing of stainless steel products: internal stress is prone to be directly affected by the processing working temperature, and a large number of chloride ions deepens the stress corrosion. In the plasma cutting process, the local working temperature is too high to cause the austenitic stainless steel grains to become larger, and even local melting occurs, the internal stress is too large, and the stress corrosion is particularly prominent. In the indoor temperature polishing process, even if the corrosion phenomenon can be reduced by adjusting the polishing liquid formulation method, there is no way to completely avoid stress corrosion and intergranular corrosion. To effectively control intergranular corrosion and stress corrosion, we must start with the processing technology of stainless steel equipment and strictly control the process technical parameters, including welding technical parameters, laser cutting methods, heat treatment process temperature, etc., to avoid crystallization and internal stress concentration.