Stainless steel of various kinds, room temperature according to the organizational structure can be divided into several categories:

1 austenitic: such as 304, 321, 316, 310 etc.;

2 martensite or ferrite: such as 430, 420, 410 etc.

Austenitic type is non-magnetic or weakly magnetic, martensite or ferrite is magnetic. Usually used for most decorative tube plate stainless steel is Austenitic 304 material, generally speaking is non-magnetic or weakly magnetic, but fluctuations in chemical composition caused by smelting or processing status of the different magnetic properties may also appear, but this can not be considered to be counterfeit or substandard, what reason is this? Austenite is the above-mentioned non-magnetic or weakly magnetic, and martensite or ferrite is a magnetic, due to refining the composition segregation or improper heat treatment, will cause a small amount of martensite Austenitic 304 stainless steel body or ferrite. In this way, will be 304 stainless steel with a weak magnetic. In addition, 304 stainless steel after cold working, organizational structure will be transformed to martensite, the greater the degree of cold deformation, the more martensite transformation, the greater the magnetic properties of steel.