Magnetic stainless why magnetic

Many customers often think that the magnet adsorption of stainless steel material, verify the authenticity of the advantages and disadvantages, don't smoke non-magnetic, that is good, magnetic stainless steel sheets  goods at a fair price; the suction magnetic, that is fake fake. In fact, this is an extremely one-sided, not practical error method of identification, I hope the following contents will be helpful to you! Many kinds of stainless steel, room temperature according to the organizational structure can be divided into several categories: 1 austenitic: such as 304, 321, 316, 310; 2 martensite or ferrite such as: 430, 420, 410; austenite is non-magnetic or weak magnetic properties, martensite or ferrite is a magnetic. Magnetic stainless is commonly used as a decorative stainless steel  pipe, stainless steel plate is most of austenitic stainless steel 304 material, generally speaking is non-magnetic or weakly magnetic, but caused by smelting chemical composition fluctuation or the processing status of different magnetic stainlesssteel  properties may also appear, but it cannot be considered to take card or unqualified, what reason is this? Austenite is the above-mentioned non-magnetic or weakly magnetic, and martensite or ferrite is a magnetic, because smelting when segregation or improper heat treatment, will cause a small amount of martensite austenite stainless steel in 304 body or ferrite. In this way, will magnetic stainless with a weak magnetic. In addition, magnetic stainless after cold working, organizational structure will be transformed to martensite, the greater the degree of cold deformation, the more the martensite transformation, the greater the magnetic properties of steel. Like a lot of the strip, the production of phi 103 tube, no obvious induction, the production of pipe. Because of cold bending deformation of large stainless steelp late suppliers  is obvious, producing rectangular tube due to deformation than the cylinder, especially the angle of deformation, more intense magnetic more obvious. Magnetic to completely eliminate the causes of 304 steel, can be opened through the high temperature solution treatment to restore the stability of austenite, thereby eliminating magnetic. In particular, magnetic because it causes 304 stainless steel, and other materials such as stainless steel, carbon steel, magnetic 430 is not the same level, that is to say the magnetic steel 304 always showed a weak magnetic.