The folding edges of stainless steel heads exhibit particularly strong ferromagnetism
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Is it the heating or deformation at the folded area that causes the carbon content in the stainless steel to shift?
During cold bending, stainless steel undergoes cold working, which causes changes in its microstructural structure. The stable austenite gradually transforms into martensite; the longer the processing time and the greater the degree of deformation, the more martensite is formed. As a result, the stainless steel acquires weak magnetism and can be attracted by magnets. Should we consider adding heat treatment to restore mechanical properties?
It is a normal phenomenon in the cold working of austenitic stainless steel: the greater the deformation, the stronger the magnetic force. It can be restored through heat treatment.
According to available information, at room temperature, austenitic stainless steels generally exist in a metastable austenite phase. When the material undergoes plastic deformation, transformation of austenite into martensite occurs; this process is commonly referred to as strain-induced martensite transformation. For product processing, the martensite formed as a result of deformation has a significant impact on the mechanical properties of the stainless steel, as well as on its subsequent assembly and use.
Stainless steel end caps generally should not be spun; they should be stamped instead. If hot pressing is used, heat treatment to restore their properties is required
It is essential to consider the operating conditions of the container, such as the medium and temperature, etc. If the temperature is low or intergranular corrosion occurs, re-solution treatment is necessary.