People often think that the magnet sucks the vacuum pump material, verifies its merits and demerits, does not suck the non-magnetic, considers that is good, the goods are genuine; Sucks the magnetism, thinks that it is the counterfeit fake. In fact, this is an extremely unilateral and imprecise method of identifying mistakes. A wide range of vacuum pumps, according to the organization at room temperature can be divided into several categories: 1. Austenitic: such as 304,321,316,310, etc .; 2. Martensite or ferrite type: such as 430,420,410, etc .; austenitic type is non-magnetic or weakly magnetic, martensite or ferrite is magnetic. Vacuum tubes, usually used for decorative tubesheets, are mostly austenitic 304, generally magnetically or magnetically weak, but may also be magnetically susceptible to chemical composition fluctuations or processing conditions due to smelting, but this can not be considered as Counterfeit or unqualified, what is the reason? Mentioned above, austenite is non-magnetic or weakly magnetic, and martensite or ferrite is magnetic, due to smelting composition segregation or improper heat treatment, can cause austenitic 304 vacuum pump a small amount of martensite or ferrite Body tissue. In this way, 304 vacuum pump will have a weak magnetic. In addition, 304 vacuum pump after cold working, organizational structure will be transformed into martensite, cold deformation, the greater the martensitic transformation, the greater the magnetic steel. As a number of steel strip, production Φ76 tube, no significant magnetic induction, production Φ9.5 tube. Deformation due to a larger bending magnetic deformation was obvious, the production side of the rectangular tube deformation due to the large tube, especially the corner part of the deformation more intense magnetic more obvious. To completely eliminate the above reasons caused by the 304 steel magnetic, high temperature solution treatment can open recovery of stable austenite, thereby eliminating the magnetic. In particular, the magnetic properties of the 304 vacuum pump, which are caused by the above reasons, are completely different from those of other vacuum pumps, such as 430 and 430, that is to say the magnetic properties of the 304 steel always show a weak magnetic property.
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