How to identify materials stainless steel centrifugal pump use? Why also magnetic stainless steel?

stainless steel centrifugal pump belongs to a kind of stainless steel chemical pump, with corrosion resistance, in the form of mechanical seal, stainless steel centrifugal pumps, the pump casing, impeller, pump shaft, water pump cover, seal, support, bearing housing, bearing, coupling, motor, flooring and other parts. Many different kinds of stainless steel, stainless steel centrifugal pump materials generally have: 1, the martensite or iron grain size: such as the 430, 420, 410, etc; 2, austenite size: such as 201, 202, 301, 304, 316, etc; 3, austenite size is non-magnetic or weak magnetic, martensite and ferrite are magnetic.

why some stainless steel magnetic tape? We often assume that a magnet adsorption stainless steel material, verify the quality and authenticity, not without magnetic absorption, think is good and true; Magnetic suction, is believed to be fake fake. Actually, this is a very one-sided, not real wrong about it. Often used as decorative tube plate mostly austenite size of 304 stainless steel material, generally is non-magnetic or weak magnetic, but caused by smelting chemical composition may also appear different magnetic fluctuations or processing status, but it cannot be considered a counterfeit or substandard, what reason is this?

austenitic presence of magnetic or weak magnetism, is martensite and ferrite magnetic tape, because of improper smelting composition segregation or heat treatment, can cause a small amount of martensite in the austenitic stainless steel 304 or ferrite organization. In this way, will with weak magnetic 304 stainless steel. In addition, 304 stainless steel after cold working, the organization structure will be to the martensitic transformation, the greater the degree of cold deformation, martensitic transformation, the magnetic steel. As a number of steel strip, the production & Phi; 76 tube, no obvious magnetic induction, production & Phi; 9. 5 tubes. Because ling bending deformation is magnetically sensitive to some apparently, rectangular tube production due to the deformation is bigger than circular tube, especially the Angle, more intense magnetic more obvious deformation.

in particular, due to the above magnetic causes of 304 stainless steel, stainless steel with other material, such as 430, carbon steel magnetic completely is not the same level, that is to say 304 magnetic always shows the weak magnetic steel. To eliminate the causes of 304 magnetic steel treated by high temperature solid solution stability returns austenitic organization, thus eliminating magnetism. Note: if the stainless steel is weak magnetic or completely without magnetic, should distinguish material for 304 or 316; If the magnetic with carbon steel, show strong magnetic, 304 for judging is not material.