People often think that magnets adsorption solenoid Valve material, verify its merits and authenticity, no adsorption no magnetic, that is good, good quality at bargain price; absorption by magnetic, then considered to be counterfeit fake. In fact, this is an extremely one-sided, non-practical wrong identify way.
Wide variety of solenoid valve, it can be divided into several categories at room temperature according to the organizational structure:
　　1．Austenite-type: such as 304,321,316,310, etc.
　　2． Martensite or ferrite: such as 430,420,410, etc.
　　Austenite is a non-magnetic or weak magnetic properties, martensite or ferrite is a magnetic
　　Usually used as a decorative tube plate solenoid valve mostly are the 304 type austenitic material, generally speaking, it is a non-magnetic or weakly magnetic, but due to smelting casuing chemical composition fluctuations or different processing status may also have magnetic properties, but it can not be considered as counterfeit or substandard, this is why?
The above-mentioned austenite is non-magnetic or weak magnetic and martensite or ferrite is magnetic, because smelting segregation or improper heat treatment will cause a small amount of austenite in martensite 304 solenoid valve or ferrite tissue. In this way, solenoid valve 304 will be with weak magnetic.
　　In addition, the solenoid valve 304 through the cold working, organizational structure will be transformed to martensite, the greater the degree of cold deformation, the more martensitic transformation and the greater the steel magnetic. Such as a group of numbers steel strips, producing Φ76 pipe, without significant magnetic induction, producing Φ9.5 tube. due to greater cold bending deformation, the magnetic induction is significantly, producing square rectangular tube due to deformation larger than circular tubes, especially corner parts, more intense distortion and more magnetic.
　　To completely eliminate the above causes of the 304 steel magnetic, it can use high temperature solution treatment to restore stability of austenite structure, and thus eliminating magnetic.
　　Particular to say, due to the above causes solenoid valve 304 magnetic, and other materials solenoid valves, such as 430, the magnetic steel level is absolutely not the same, meaning that 304 steel magnetic always shows a weak magnetic .
　　This tells us that if the solenoid valve with a weak magnetic or non-magnetic, it should be identified as 304 or 316 material; if it is the same with magnetic carbon steel, as shown strong magnetic, it should be identified not 304 material.

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