How to distinguish Bento lunch Box made by 304 Stainless Steel?
There are difficult to identify the stainless steel 304 Bento Box by naked eys. The compositon of harmful luch box is low in nickel and replace it with manganese. There is a stainless steel identification solution liquid on the market. That liquid can detect different stainless steel types by detecting the nickel content in stainless steel. However, there is no guarantee that other elements in the steel will affect the accuracy of the results.
In addition, the other way determined by magnetism and non-magnetism. Generally, 2-series stainless steel is magnetic, and 3-series stainless steel is non-magnetic. When neither of these ，two methods can accurately determine whether it is 304 stainless steel or not .
To be accurate to determine whether it is 304 stainless steel ？ Observing the metallographic phase and doing energy spectrum.Since the 3 series stainless steels are all austenitic stainless steels. Hardness is also different from martensitic stainless steel and duplex stainless steel.It can also be determined by the method of measuring hardness.
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