Stainless Steel Coil 304

How to Identify 304 stainless steel coils Usually used as decorative tube plate of stainless steel mostly austenitic 304 material, generally is non-magnetic or weak magnetic, but due to smelting chemical composition fluctuations or different processing State may also appear magnetic, but this...

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How to Identify 304 stainless steel coils

Usually used as decorative tube plate of stainless steel mostly austenitic 304 material, generally is non-magnetic or weak magnetic, but due to smelting chemical composition fluctuations or different processing State may also appear magnetic, but this can not be considered false or unqualified.

The above mentioned that the austenite is non-magnetic or weak magnetic, and martensite or ferrite is magnetic, due to smelting when the composition segregation or improper heat treatment, will result in austenitic 304 stainless steel in a small number of martensite or ferrite structure. In this way, 304 stainless steel will have a weak magnetic.

In addition, 304 stainless steel after cold processing, organizational structure will be converted to martensite, cold processing deformation, the more martensite transformation, the greater the magnetic steel. Like a number of steel strips, the production of φ76 tubes, no obvious magnetic sense, the production of φ9.5 tube. As a result of cold bending deformation of a larger magnetic sense, the production of rectangular tube due to deformation of the larger than the pipe, especially the corner section, deformation more intense magnetism more obvious.

To completely eliminate the above reasons caused by the magnetic 304 steel, through high temperature solution treatment can be opened to restore the stability of austenite, thereby eliminating magnetism. In particular, because of the above reasons caused by the magnetic 304 stainless steel, and other materials of stainless steel, such as 430, carbon steel magnetic is not the same level, that is, 304 of the magnetic always show a weak magnetism. This tells us that if the stainless steel with weak magnetic or completely without magnetism, should be judged to 304 or 316 material, if the same as the magnetism of carbon steel, showing strong magnetism, because the discriminant is not 304 material.

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