Why can stainless steel commodity also take magnetism?

Why can stainless steel commodity also take magnetism?

People often thinks magnet is adsorptive stainless steel material, test and verify its actor bad and true bogus, do not suck without magnetism, had considered as, renown carbon comes; The person that suck has magnetism, consider as pinchbeck fake. Original, this is a kind of extreme is one-sided, of unrealistic fault discern method.

The breed of stainless steel is various, can divide by arrangement construction below normal temperature it is a few kinds:
1. Austenite: Be like 304, 321, 316, 310 etc;
2. Martensite or ferrite: Be like 430, 420, 410 etc;

Austenite it is not to have magnetism or weak magnetism, martensite or ferrite are magnetic.
Use as normally the stainless steel majority that decorates tube plate is austenite model 304 raw material, will tell normally do not have magnetism or weak magnetism, but because take exercise to form chemical composition to shake or machine condition different perhaps also present magnetism, but this cannot consider as pinchbeck or unqualified, what element is this?

Respecting austenite is not to have magnetism or weak magnetism above, and martensite or ferrite take magnetism, slant because of the composition when taking exercise analyse or heat treatment misgivings, can form austenite martensite of the minority in 304 stainless steel or ferrite arrangement. So, puny magnetism can be contained in 304 stainless steel.

Other, 304 stainless steel pass cold working, arrangement constructs to also can be changed to martensite, cold working is out of shape degree bigger, martensite is changed more, the magnetism of steel is bigger also. Be like the metal strip of one lot number, produce 76 canals of Φ , without showing magnetism sense, produce 9.5 canals of Φ . Because Ling turn is out of shape bigger magnetism feels,showing a few, produce square rectangular canal because deflection is bigger than round canal, especially knuckle part, be out of shape more acuteness magnetism more showing.

Want the magnetism of the 304 steel that afore-mentioned elements form comb-out, can open rehabilitation through high temperature solution treatment arrangement of smooth and steady austenite, next expunction is magnetic.

What should put forward particularly is, because of above the magnetism of the 304 stainless steel that the element forms, with the stainless steel of other raw material, be like 430, the magnetism of carbolic steel is not same level thoroughly, that is to say what the magnetism of 304 steel shows all the time is weak magnetism.

This tells us, if stainless steel belt is weak magnetic or do not take magnetism thoroughly, should differentiate is 304 or 316 raw material; If the magnetism with carbolic steel is same, show a ferromagnetic, because differentiate is,not be 304 raw material.

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