Why the casting stainless steel butterfly pneumatic valve are magnetic?

people use magnets stainless steel butterfly pneumatic valve, verify its quality and authenticity, actually this is a one-sided, not real errors of disc don't method.

there are many types of stainless steel. According to room temperature structure classification, a markov size, austenite, iron element size and duplex stainless steel, etc. ; And non-magnetic or weak magnetic austenite size, other type has strong magnetism.

stainless steel butterfly pneumatic valve CF ( 、CFM( 、CF( L、CFM( L, et all belong to austenitic stainless steel is non-magnetic or weak magnetic, but caused in smelting austenitic organization structure with a small amount of martensite or ferrite to connect together, and uneven distribution, less about %, how about %, when more content in the casting is magnetic. But the ferrite content of castings higher strength will be better. At present our country and international % austenitizing treatment process is not yet. Austenitic stainless steel castings in solid solution treatment, it just makes carbide into austenite, enhances the casting of the resistance to corrosion, can't change the content of martensite and ferrite, just make organization structure change a little, little reason to reduce the effect of magnetic. Blank in the process of cold working will also charge a little magnetic.

stainless steel butterfly pneumatic valve to reduce magnetic key is to control the content of martensite and ferrite, the less magnetic is smaller, or make their organizational structure fracture, uniform distribution. Pipes, sheet is after many times of billet heating, extrusion and cooling process, this process has been interrupted the unification the organizational structure of the martensite and ferrite, and makes the distribution is very uniform, so the small pipes, sheet of magnetic or feel.

stainless steel butterfly pneumatic valve standards, whether in China or other countries have no magnetic testing this item, it's not as if stainless steel qualified standard. Especially, due to different reasons of austenitic stainless steel magnetic, magnetic completely with other material of stainless steel, carbon steel is not the same level, namely austenitic stainless steel magnetic always shows the weak magnetic.

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