Stainless steel valves can absorb magnetic, how be to return a responsibility?

by:AIRWOLF     2020-05-21
Stainless steel valves can absorb magnetic, how be to return a responsibility? Stainless steel valve usually most is 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. Austenite is non-magnetic or weak magnetic, martensite and ferrite magnetic, due to 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 ingot, threaded valve production, no obvious magnetic induction, the production of flange valve. It is exposed to air for larger area ling some larger magnetic induction bending deformation is obvious. Will absorb magnetic stainless steel, and its reason is that at the time of production and processing, casting process to produce magnetic. And do not say our stainless steel material is not authentic, a lot of times people have a misunderstanding, often into the erroneous zone of the people, not the other reason is that professional knowledge is not strong enough. Stainless steel valve will suck the magnet is does not affect use, see whether authentic 304, could not see the magnet to absorb! Magnetism is physical properties, and stainless steel valve is corrosion resistance point is chemical properties. Some valve manufacturer to cut corners, and cheap Mn in stainless steel, so also can't be a magnet to absorb, but is not the pure 304, depends on whether authentic 304 material is qualitative, not judged by magnets. So why stainless steel material can be magnets? Because 304 is containing C ( Carbon) , and then processing when the content of C a bit can be a little more magnets, but the standard is allowed. Some valves manufacturers to cut corners of adding more Mn ( Manganese) Still cannot be magnet suck up, customer thought are of 304 stainless steel material is not pure, the use of stainless steel are the physical properties of chemical properties is not look.
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