Now on the market of stainless steel products are not of nickel and chromium content, the consumers and how to identify the excellent and defect of stainless steel products? In response, many Internet users and some of the so-called "brick house" numerous and complicated action: use the magnet adsorption stainless steel material, verify its quality and authenticity. Adsorption of goods, think is good and true; Can absorb are magnetic, is believed to be fake fake. That this way is not correct?
Originally, this is a unilateral way to distinguish. Developed in the world now use the five classes of stainless steel, austenite stainless steel body, such as 304, 321, 316, 321, usually is not magnetic; And martensite or iron grain size: such as 430, 420, 410, or there are magnetic ferrite. But for smelting form chemical composition fluctuation and 304 stainless steel by stamping, polishing processing, arrangement structure will also transforms to martensite shape, and take the weak magnetism, the magnet is able to absorb the same, and the machining deformation degree, the greater the martensitic transformation, the magnetic steel. So judging whether by magnet can suck up to 304 stainless steel is obviously not scientific.
Often see some sell dropdown sales, as with a magnet to our sales, stainless steel is not sucked, otherwise known as iron. In usual days we often hear, "practice iron to produce" "hate iron not to produce" and other words.
What is the difference between the iron and steel? Is so, the difference between the iron and steel in the carbon content,. Carbon content is under 2% of the iron carbon alloy steel, carbon content over 2% is called iron. About the stainless steel, the magnet suck up or not, just fit the quality standard and are stainless steel.
First let's, why don't stainless steel rust? Its corrosion resistance are the main elements of chrome. Chromium content in more than 11% of the steel does not rust. Chromium (ge, four tones) : the world's most solid metal, chrome plating on the metal to rust. Containing chromium, so is the stainless steel stainless steel. But in chrome and stainless steel are not suck is no contact.
Second, the stainless steel why don't you get sucked? Nickel (nie four tones) : nickel element in reserves in the world, rarely offer valuable. Thus, a high content of nickel in stainless steel in the market price is higher also, and magnet suck. Let's call this steel austenitic steel.
Originally, there is a kind of stainless steel is not on the magnet. That is less high manganese containing nickel or nickel stainless steel. But this steel will be cheaper than austenitic steel will be many. Get rid of these two kinds of stainless steel, and other stainless steel were magnets. Because of austenitic stainless steel for low heat conductivity, using it to do the kettle, frying pan, pot is not appropriate, will abuse the power, also extended moment of boiling water to cook. Do with ferritic stainless steel frying pan, pot, not as long as good corrosion resistance, and its thermal conductivity is higher than austenitic stainless steel nearly half. But this kind of stainless steel is sucked, let's try to go back.
So we can conclude that the stainless steel is divided into many kinds, but as long as the two are not magnets, one kind is used to decorate material of austenitic stainless steel, the other is a high manganese content of stainless steel. Other such as maximum classification of ferrite and martensite stainless steel such as are the magnets suck.
And if the stainless steel for manganese limit beyond specification, magnets, the same is not suck. Want to test is stainless steel pot information is excellent 304 stainless steel, can only use professional equipment to measure the inside of the parameters, such as nickel, chromium, manganese content abilities concluded. So no matter how, we in the acquisition of stainless steel goods, must pay attention to the commodity inspection certificate or the certificate of quality, choose promise outstanding businesses, and do not covet is cheap, excellent high cost of stainless steel, the price is too low goods must is low defective acted as the steel.
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