The difference between the 304A stainless steel wire mesh and the 304 stainless steel wire mesh is not very large, 
but the mechanism of the stainless steel rust prevention is that the alloying elements form a dense oxide film, which is insulated from oxygen contact and prevents further oxidation. It is true that 304A meets the requirements of 304, and is better than 304. It seems that it can automatically replace 304. However, from the mechanical properties of Table 2, the strength of 304 is higher than 304A. When designing according to 304, replacing with 304L will result in strength. not enough;
In addition, in China's pressure vessel standard GB150-1998, 4.1.6 stipulates that: when the use temperature of austenitic stainless steel is higher than 525 °C, the carbon content in
steel should not be less than 0.04%. It can be seen from Table 1 that most of the 304 can be used, but 304A cannot be used.
A304L is an American standard, and its Chinese national standard is 00Cr19Ni10.
Technical experts from wheat stone manufacturers: Austenite has a solid solution with low plasticity and low strength, and high toughness. Does not have ferromagnetism. Therefore, one of the ways to distinguish austenitic stainless steel tools (common 18-8 stainless steel) is to use a magnet to see if the tool is magnetic. In addition, because austenite is a face-centered cube, the tetrahedral gap is large and can accommodate more carbon.
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