This type of stainless-steel also has good drawability. It can be formed into many different designs and, in contrast to kind 302 stainless, can be used with out annealing, the heat treatment that softens metals. Sử dụng axit đặc như H2SO4 hoặc HCL để kiểm tra. Nhỏ một giọt axit https://www.youtube.com/watch?v=aScUyjIFIYY